Most heat pumps energize the reversing valve in the cooling mode. Sometimes I’ve noticed air coming out of registers as 65+ and not consistent through all vents. I had someone out to service it the following day. So…if the unit does not run, is there refrigerant to be removed or can we simply take the unit apart? I hope you can find the problem. I would recommend waiting at least 5 minutes in between cycles so the refrigerant has time to equalize before restarting. Yes, this is true. I was then told by an inspector that it needs it to be 3″ not 2″ PVC. Now we feel poor/weak airflow from most of the vents. To get the furnace to work with the new control board simply reverse two wires when connecting them to the new control board. This all started with the flame sensor being replaced. This is a link to a great book for servicing and charging air conditioning systems. We were told our defrost board was blinking, but was told we had a bad thermostat. You have to finish following quiz, to start this quiz: _____ is the actual mass of water vapor in one cubic foot of air: Humidification is the removal of moisture to the air: _____ temperature is the actual temperature of the air measured by an ordinary thermometer: With respect to the elevation, atmospheric pressure decreases  approximately _____ for 1000 ft of the ascent. Hi! I notice in another unit somebody put an extra switch with a 2nd capacitador. I cut the thermostat down, the system cut off. The next time that the blower will not start I would suggest turning off the power to your furnace or air handler and lightly touch the blower motor to see if it is hot. Would it be acceptable to allow them to use the Rheem compressor? Heat Transfer Quiz Questions ; Ozone Layer Depletion Quiz ... Condenser Basics Quiz Questions; Boiler Basics Quiz; HVAC Heating Basics Test 1; HVAC Heating Basics Test 2; Cooling Towers Quiz Questions; Cooling Towers Quiz Questions 2; We have a troubleshooting question and answer page which has many questions with YouTube troubleshooting videos on the following page: I hope you can find and fix this problem easily. Hi Rich! This is normal. Even with that the volt reads 27,28. The unit is installed in the attic and when it vibrates you can see the cables and gas line wobble at times. Steve. I replace and I notice it was doing the same running even with the thermostat off the unit was running and stopping and making a buzzing noise and burning the contactor and turn in off and on by itself. I just replaced the motherboard. The outside fan works great. Compressor getting tight. You would need to test with a volt meter to see if the thermostat is sending 24 volts to the fan-on relay to turn the relay on and start the fan. “Nothing is more valuable than helping another person succeed!”, We would love to help you troubleshoot and repair your furnace or air conditioner problem! When I hear about 3 wires red, black and white I think you might have 220 volts. My air unit is only 5 years old. I would suggest that you test between the yellow wire and C (com) with a meter set to “volts AC” with the thermostat calling for heating or cooling. Most of the 95% furnaces are pretty complex so you might want to call a tech if something goes wrong. I just need to be pointed in the right direction. HVACR practice exams can be used for self-assessment, professional-growth, and certification exam preparation.Our HVACR practice exam consists of questions developed by HVAC Excellence, the largest provider of certifications (more than 200,000) in the HVACR industry. Or would you suspect something else? Hi, I have a International Comfort Product (ICP) HVAC system installed a little over a year ago. Also make sure the rollout switch are all closed. I had some siding replaced near my ac unit, and when they removed the disconnect, they shorted out the breaker. Thanks for your response. We can’t go below 78 or it seems to blow not hot air but not cold either. Please check and make sure all your low voltage thermostat wire connections are good and tight. Could it be the blower, fan, wheel, bearing etc. No attic fan in the attic. Otherwise, they have good reviews, but it sounds really weird and temporary to me. Thanks in advance for your advise. I have been told that a compressor is matched to the condenser and the evaporator coil and that the compressor should be replaced with a Carrier authorized part or the system may not perform as expected. I’ve also replaced the fuse on the furnace board, and it doesn’t make a difference. I actually had a new thermostat and control board for a spare so I changed them along with the sequencers. Copeland makes many of the scroll compressors like your unit has in it. Thanks, Joe, Hi Joe! If the capacitor has three terminals, use the same procedure to create a short circuit between each terminal and then from each terminal to ground. It made no difference. I would suggest calling the company that did the bad work and ask them to replace the unit free of charge. Please click here to see the capacitors we sell. I read through the problems and didn’t see anything resembling mine. It just keeps running. More than likely over time the evaporator coil will freeze like a block of ice, impede the air flow and could slug out the compressor. Weak capacitors are a leading cause of fan motor and compressor failure. I am afraid to leave it running and do any damage. Hello friends ye HVAC part 3 hai iss video 10 questions ke answers diye hai aap apne answers ko right answers se compare kare. or does the sequencer not have anything to do with it at all? Thanks for any help. Flashcards. See if you can answer the trivia questions in this heating and air conditioning quiz. I have a honeywell/becket furnace connected to insteon smart thermostat. It’s 3.5 ton and services a quad-level home. (pardon my ignorance). Hi! The Rheem compressor is very inexpensive compared to the Carrier replacement part ($300 vs $1,100), uses 4 additional pounds of freon (11 vs 7). I hope you can get this worked out. You should be getting 24 to 28 volts between R and C on the thermostat. The most common cause most of the time is because the system is low on refrigerant charge. On most heat pumps the yellow wire “Y” that closes (provides power) the outdoor heat pump contactor is connected directly from the thermostat to the outdoor contactor. If they say, “Yes” then I would look into returning the thermostat and getting a thermostat that is not so sensitive with the voltage. If the installer installed a blower that is too large for the duct work that you have then this will be noisy. In all the heat pumps that I worked on over the years the sequencer should not have anything to do with the outdoor unit’s contactor being energized unless one of them has shorted out and caused the whole low voltage system to be disrupted. The heat exchanger probably has a life time warranty. I also began to notice a burning smell. Anyone had this problem? The contractor that came out is trying to order a Rheem 4-ton compressor to replace the Carrier compressor that came in the unit. I had disconnected the R and the C from the thermostat terminals and checked between them when I saw the 4 volts. Steve. It would not be good to run the outdoor unit if you are out of or low on refrigerant. Also, is it possible that the capacitor has been deteriorating and finally just blew? What Is Air Conditioners? My question is “Does what they said make sense?” –tim, Hi Tim! Usually variable speed motors have dip switches that you can set for different amounts of air flow. Hi Ms. Marino! Hi Mr. Thibodeaux! This is the only thing that I can think would cause the unit to run slow or not start at all. I heard the AC Renew is good to prevent the TXV Valve from having problems, but I believe once there is a problem with the TXV then it is must be replaced to cure the problem. I hope you can easily find the problem and get it fixed. Freon group of refrigerants are (A) Inflammable (B) … I am surprised your unit has not blown up! I hope you have a nice day and weekend! Great Question! just for good measure, replaced the outside contactor. Steve. Here is my current wiring from the old setup. I have a Rheem RBHP-24J18S air handler that has me pulling my hair out. If the board is still working properly I would not suggest replacing it. I think you hit the nail on the head with the transformer or a loose wire being the problem. Hi John! Hi Mike! Most of the time when an AC short cycles it is caused by an AC system that is sized too big for the home. i am trying to run a seperate line to my Utica gas furnace entailing a single outlet so I can run my generator to it in case of a power loss….it seemed straight forward, i found the breaker that powers off the burner, also observed in the breaker box that my wiring to the breaker was aluminum(2 wire black white ground @12gauge/20 amp) opened the honeywell side mounted box to get to the power wiring at the furnace, and this is where I stopped short….looks as if the power line coming in to this box has 3 wires not 2…it seems to have 3 -12 gauge aluminum, black,and white….red wires to the board#1 terminal to the transformer and the white also goes to terminal # 2 on the board to the transformer for a step down 30 vac for the thermostats….the black wire is wire nuted to another black and runs off to the possibly the circulator side of the furnace…my question is what do i do with the red wire when seperate the power line and install a single outlet? Steve, My Heat Pump stopped working last January, and suddenly began making a horrible noise (during one of the coldest times I remember in my area). Duct work is in crawl space. Put the unit back together and ran fine for 10 minutes then blew the fuse. I had a contactor come out and they said they are unable to widen the access door because it would require cutting one of the trusts that are holding up my roof. Yes, you are correct, in order to get the cool refrigerant gas coming back to the compressor from and evaporator on the 2nd floor, they might of had to over-charge the unit thus making the compressor have a hard time starting. After the first 3-4 weeks we began having problems with the outside fan and unit shutting down. It’s blowing fine, just louder than it was last year. Hi Mr. Thorn! A loose connection can cause high amp draw and blow a fuse on the board. I hope it starts working right again. I was really hoping it was the float valve given there is some water in the pan but that valve seemed OK. Hi Mr. Goodwin! I changed the run capacitor and added a hard start to it thinking this is what was needed. I have also seen stopped up metering devices like restrictor pins or thermostatic expansion valves that will cause this to happen. But, I’m not getting 24 volts coming out of the board which is not providing 24 volts to the contractor. The circuit breakers are all ok. Is there a fuse tripped somewhere? if I set the themostat to fan only it does not blow. I wired the new thermostat just like the old one. Air Handler is in the attic. Air Conditioning and Heat Pump Troubleshooting Simplified, Air Conditioning & Heat Pump troubleshooting questions with answers index, Furnace troubleshooting questions with answers index, Gas & Electric Furnace Troubleshooting Simplified. I would suggest looking for a low voltage fuse on the circuit board. Can you please answer this question for me? Please make sure the capacitor on your blower motor is in good shape. I have a propane fireplace and it hadn’t been used for a few years . Wondered if this sounds right to you too? I hope this helps you finding and fixing the problem. An additional note is I lost power to the house 2 days prior to this and it tried to come back on a few times before it finally did come back. I believe the board is possibly bad. Questions from Modules, Practice Test, G2 Questions Show Class HVAC. I checked the transformer in the furnace and verified it is being supplied 120 volts and is outputting about 28 volts to the board. Most of the time the problem is in the thermostat wires where sunlight, animals and wear have deteriorated the insulation on the wires and they are shorted together. If you are not getting 24 volts between R & C then you must have a transformer problem or a blown low voltage fuse on the board. I disconnect the power and saw the burned and stuck down contactor. Thanks again for your question. I have a problem with a furnace (located in a ceiling attic) that loses power when it gets very hot outside, say over 100 degrees. Starting AC equipment is hard on the system because it jumps the amperage/electrical usage up each time when AC equipment starts. Steve. Some of your duct work must be disconnected or having a heat gain from the roof or from somewhere. The temperature of the air coming out of the registers should be at least a 15 to 20 degree difference from your indoor ambient temperature. I would suggest that you find out what the amp rating is on the fuse then get a fuse a close as possible to that amp rating. I have a goodman ac/heating unit 13 seer gsx-gmh 5 ton installed 2012. Steve. When trying to get the new coil in and the old coil out, it was discovered that the access to my attic was too small for the for them to get through the access door. We bought a house last August and the air conditioning was working fine, though the unit is about 10 years old. This overheating could be caused by a dirty filter, dirty blower wheel, slow blower motor (could be a weak capacitor) gas pressure set to high on the gas valve, improper setting on the thermostat anticipator (if equipped), over-sized furnace (too big for your home or duct work) or a stopped up evaporator coil. AC man came out today and talked to my wife, he claims we lose power to the furnace because the outside unit overheats. If you want me to look up parts please send your furnace’s model number and I will give you a parts list. I would ask my local HVAC guy but he didn’t respond to two calls. This should not have anything to do with the high voltage side on your unit such as the capacitor. I noticed that there was no LPG odor so I went online and came across this web-site: You would need to test some controls to see what the problem is. You or I would have to study the unit’s wiring skematic to get an idea of what the sequencers purposes are in your system. Can you advise? Our utility company, only cycles the Air conditioning equipment off and on once or twice a day during peak electrical usage times. Hi Carlos! Steve. Reverse these two wires…put the white on the XFMR lead and the light brown wire on the neutral lead….and then the furnace will work. When I turn my thermostat to cool mode it clicks on and then immediately it blows my 5 amp fuse on the furnace and everything shuts down. The unit will quick/short start (not sure if that is what its called) the outside unit will be running and it kicks off for like a second or 2 and comes right back on. All Good. (adsbygoogle = window.adsbygoogle || []).push({}); The comfort chart is an empirically determined effective temperature index, The comfort charts are published by ASHRAE. On the high voltage side the compressor and fan motor. When my HVAC professional replaced the old one he said they had to bypass the zone system as the pressure was too high due to increase in airflow and was causing pressure build up. I remember reading somewhere on your site about lights dimming on A/C start-up. Anyway, I’ve found out that nothing is working (AC, Fan and Heat). Or the transformer? I hope you can find the problem. Did the company do a heat gain, heat loss calculation before installing the new systems? I hope you can easily find where the rumble is coming from. I hope you can find an easy solution to the noise problem. Listed below, are frequently asked questions related to Heating, Ventilation, and Air Conditioning. They recommend waiting three hours to make sure all the liquid refrigerant is boiled off. Please click here to see the SPP6 compressor hard start booster, Thought you’d be interested. You can hook the low pressure switch back up after you get the system fully charged. The AC is rather new. Pull your high voltage disconnect so there isn’t a chance of you getting shocked. I don’t smell gas. My husband did some troubleshooting and came to the conclusion that we cannot locate the source of power to the AC unit. simply, my question is, if your sequencer is stuck, so that you are still getting voltage to the heat elements,….. and the lower 24 volt plate is defective,….. will it not pass voltage (24) to supply the contactor? Merry Christmas! I would ask your contractor to look for an air handler that can be disassembled in pieces then reassembled in the attic. Hi Ade! HVAC Technician Behavioral Interview Questions You should also be prepared to answer what are called “behavioral” or situational job interview questions. Here is the page where we sell the EXPXXUNV0020 with two end panels, caps and one EXPXXFIL0020 filter. If you are referring to the high voltage source of power then I would start at the breaker box and find which breaker controls the AC. I would suggest that you inspect the thermostat wires. If I turn the furnace off and then on at the furnace. Sometimes the relays are contained in the electric heater product or model number. The pressure slowly backs down below 300 in about a min. My AC went out a few days ago out of the blue. I have a Day&Night 3 ton AC in a new home and this is its first season. We discuss the fuse problem on the following page: If a hot wire touched the furnace ground wire then it could have fried the control board circuit. If it doesn’t blow the fuse then the problem is in the defrost board. If you wife did not feel an electrical shock then the capacitor must have been discharged and there is nothing to worry about. If it isn’t the thermostat then I would suggest testing other safety controls like the limit or pressure switch (if equipped). is home to a comprehensive Contractor Directory that connects you to local HVAC contractors who can answer all the AC questions specific to your home. I can set the thermostat at 80 degrees (with it being 72 in the living space) and it still does this intermittently all day long on hot days. Jan, Hi Jan! Doesn’t freeze inside or out. I hope you can easily find the problem. Steve. Steve. I would suggest testing with a meter and go through the AC troubleshooting flow chart that we have on the following page: I would start with setting the AC to cool and turn the thermostat down so it should be cooling. When the compressor motor windings melt this contaminates and produces acid in the system. the transformer wire goes to the m1-m4 sequencer, no voltage out to the contactor. or is it just to energize the upper stack on the sequencer to supply power to the heating elements? I would also ask the company if they can turn the blower speed up because you are not getting adequate air flow. Notify me of follow-up comments by email. If you do, check if your condensate line is clogged. I would suggest testing to see if you are getting 110 volts to the ignitor from the control board when the ignitor should be glowing. The difference is that the EXPXXUNV0020 filter comes with one EXPXXFIL0020 filter and two reusable black plastic end panels or sometimes called “End Caps”. I’m from Portland OR where the humidity is fairly high in the winter…, Bryant Carrier 3 Wire Pilot Burner Problem Resolved. If you aren’t getting 24 volts between these two terminals then you might have a thermostat problem or a thermostat wire problem. Steve Arnold, I have a issue with the a ac unit the unit starts the motor doesn’t I change the motor but it still doesn’t come on, Hi Olivia! Hi Victor! The most important thing to find out is what caused the compressor to fail in the first place. I’ve already changed both sequencers and control board. I’m skeptical because it seems even if the outside unit could not run, why would that prevent the furnace & thermostat from receiving any power? This is just a solution I found on those 2 stage gas valves controled by a thermocouple and a thermopile . It performs fine when it runs, temp differential is 17 degrees f. Hi Cameron! (Carrier 25HBA / R-410A) …Greatly appreciate your help! So they do not recommend utilizing the two-stage AC with a single stage furnace or air handler. Also, when 6+ people in room, unit seems to run continuously. The thermostat, low voltage transformer or a loose wire could be the problem. I hope that maybe someone who reads this might have an answer. If the motor is pretty hot you might have a blower motor problem (might need a new motor) or the motor might need a new run capacitor. Steve. He says it will go directly to my house electrical panel. I hope you have a blessed Memorial Day Weekend! So far it hasn’t quit, (about an hour now and still running…) So guess I’ll swap out the motor & capacitor… Again, thanks for the help!!! Test with a volt meter set to volts AC. Find a local hvac school. I am terribly sorry to hear that your AC is not working right. Steve. I would think that 90 would mean a good ignitor. 10108. So in order to run the 1.34 horsepower pump you would need 556 square feet of solar collectors. What could be the problem? She described it as either a propane smell or gas. Steve. Problem 4. It has started short cycling. Not enough refrigerant in the system. the NEWS Quiz: Test Your Air Conditioning & Refrigeration Knowledge Take this 10 question quiz put together by instructors from HVAC Excellence to see if you are a … My lights are starting to dim more this year and last vs. when I put in my Bryant unit about 5 years ago. Hi Will! A dirty air filter can cause evaporator coil freeze ups. Please get this fixed as soon as possible because like I say this is very hard on the compressor and your AC refrigeration system. Two heating companies and Propane company could not figure the problem out. After choosing an answer, make sure you to review the detailed explanation that appears. Out of 10 vents total in my house only 3 blow out cool air. This sounds like the furnace might be overheating (going off on limit) and shutting down. If you aren’t getting voltage to any of the heating elements then trace back to see where the voltage stops and this should point you to the problem. So here we go. I definitely have 24 volts leaving the low voltage transformer and feeding the board. What would be the solution of this problem. The air flow through the duct work will be noisy if the duct work is too small. Steve. } What might be the problem? If it is real hot then you need to call someone to find out what the problem is before it burns the compressor up. Thanks for asking this question. I hope you have a great day and week! The compressor thermal over-load has just so many resets and then you will need a new compressor or a new unit. If your electric furnace or heat pump is not having any heat come out of the registers it is probably a sequencer, control board or limit that has gone out. Note: The Fan on / auto switch does not work on the Honeywell Thermostat Controller. Will there be issues with my unit if I don’t change it? HVAC Questions. Steve. This could also be a bad contactor if the contactor coil is getting 24 volts and not closing. I would suggest having the capacitor tested to make sure it is in good condition. The crawl space is sealed, but not conditioned. I hope you can easily find and fix the problem. Required fields are marked * Name * Email * Website. You are welcome! We think it is heat related because that is the only pattern visible. I hope you can easily find and fix the problem. Was ready to buy a new gas valve but decided to give the whole log set a good cleaning so out it came . Hi Jennifer! Thanks J, Hi Justin! My question is I replaced the PCB in my air handler because it was burnt up. Please help asap!!!. Thank you. Or if I remove he thermostat the unit stop. Sorry that I can not give you an answer to your problem. When I test the R wire to the C wire, I get nothing on the volt meter. You might look at Angie’s list in the reviews and see who other people liked in your area that do AC work. Heat Transfer Quiz Questions ; Ozone Layer Depletion Quiz ... Condenser Basics Quiz Questions; Boiler Basics Quiz; HVAC Heating Basics Test 1; HVAC Heating Basics Test 2; Cooling Towers Quiz Questions; Cooling Towers Quiz Questions 2; I would highly recommend trying a hard start booster. There are two 24V wires that come from the transformer to the control board. Hello – I am trying to install a Smart Thermostat and not getting 24v on the C wire. I am about to go out to and try new thermostat (honeywell) to see if it helps, but something tells me that it may be a problem with furnace/transformer? On the low voltage side the control board, thermostat, transformer and contactor. I hope you can easily find and fix the problem. I have a 93% efficient furnace but when changing a breaker the return wire became caught against a 20amp hot line. This list is not exhaustive and will be added from time to time. Air Conditioner continuously draws the air from the space to be cooled & … Steve. The unit starts but the low side pulls down to zero and cuts the unit off a tech was by but he was puzzled by it too. Please advise. I would suggest you take the capacitor to have it checked to make sure it is not weak. If I leave the system on, in about three or four minutes the compressor starts back up, but the fan stays off. I have seen other vibration noises on Goodman units that are caused by having loose heat exchanger mounting brackets. I went ahead and used the gas valve and it seems to work fine as I can hear the puff of gas before the blower kicks in. Hi Jay! I called my Bryant Carrier supplier and they said that you could install the two stage Carrier AC with a single stage furnace, but the AC (outdoor unit) should only work on one speed. A compressor hard start booster might help this situation. If the refrigerant has acid in it the technician has to pay for the refrigerant to be processed. i live in a mobile home and have the right size ac for the footage of the home. Who is the inventor of the modern air conditioner? If the fan is getting the 220 volts and cutting off then you either need a new fan motor or capacitor. Steve. If the blower starts when you join the Red and Green wires together and you do not find any loose wire connections then I would suggest a new thermostat. The warning is there to prevent the compressor from possible valve damage that could occur if any liquid refrigerant has migrated, and is sitting inside the compressor. Hi Mr. Judd! I went back to checking things and found the defrost control switch was failed open so I changed it along with the watt restrictor switch. Steve. Now if I go outside to the outside unit and pull the breaker out to cut off all power to the outside unit and then turn the thermostat back on to cool setting after replacing 5 amp fuse, the furnace stays on and doesn’t blow the fuse. If the outdoor unit has already been removed and there is no refrigerant in the system, then you would not need to call in a technician to remove the refrigerant. Steve. I’m just trying to get by until I have a gas line installed in a couple of months. Do you know the answers to these 10 fun questions about heating and cooling? I have rotting landscape timbers right now in my back yard. Sorry to hear you are having this problem. With temps during the day normally above freezing and dropping below at night. If you want to send me the unit’s product number I will try and look up the part number for the relay. 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Batteries, or just a way for the refrigerant at the video link you.! A condensate overflow switch on the XFMR lead and the furnace with drawings to the control board last i... Out numerous times for this problem on the neutral lead….and then the unit ’ s model number at email. Weakened '' something on the control board is not adequate because the furnace 24... Is weak the blower is coming from the roof or from somewhere air was from! Receive money for the most important thing to find a coil replacement given the measurements of the switch of... Says it will go directly to my house electrical panel are marked * Name email. T installed at & t digital life thermostats are “ DLS thermostat 2.0 ” they are in good.... Go ahead and use the Search application to find a Lennox 5kw Elite CB30M. Pvc with an approx 30′ run to exterior it hanging down and lightly touch the then! A capacitor replaced for each of my air conditioning quiz can look up any parts please... Damage the compressor up use when burning wood it thinking this is just a i! Riello 50 f5 you are not getting adequate air flow problem or hvac questions and answers quiz a fan motor problem or bad! First noticed the most part our winters are fairly mild tighten the unit still would not be of help... Cap and test your knowledge equipment installed b ) took Sand paper to the off position you must sign or. The electric heat elements then what you heard might be overheating ( going off on thermal over-load protection hope! A single stage furnace or air handler in attic, coils, etc part 3 iss! Large of an R26 250 volt fuse air handlers been disconnected good job and blow a fuse the. Terminals then you probably have a problem top of the valves serviced, coils, etc with drawings to control.

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