I hope you get this fixed soon. Sorry you are having problems! Looking forward to a career in HVAC? I hope that I have given you some insight on what to look for. I hope you have a great day and week! Steve, I recently had my HVAC unit replaced. What could be the issue? I hope this answers your question. We think it is heat related because that is the only pattern visible. You should be able to spin the fan blade and the blade should continue to spin for a few seconds. If the air coming out of the vents is not cool I would suggest hooking up gauges to the unit and see if the compressor is pumping or not. I would suggest having the capacitor tested to make sure it is in good condition. Comment. I read through the problems and didn’t see anything resembling mine. I hope you have a nice day and weekend! Take care, Garry. Please make sure the batteries in the thermostat are in good shape. With this small of a motor I would not think that you could have more than a 2 ton air conditioner installed with this furnace. HVAC Test Questions. If you would like for me to look up any parts then please send me your furnace’s model number. The fan does not turn on. So I would need the heater model number to look up the parts. I paid one of them to change the transformer on the furnace to 24 volt. If you do not then you either have a broken wire or a thermostat problem. Any loose connections can cause arcing and excessive heat. My home was hit by lightning last week. Then I had the ceiling filters cleaned out. The thermostats should work with this voltage if the AT&T digital life thermostats are designed to work with a 24 volt system. I would suggest turning off the power to the furnace and check the blower wheel with a mirror to make sure it is clean and there is nothing stuck in the wheel. Home; HVAC Basics. I believe the board is possibly bad. I was told the one for that coil that kicks on could be bad which would make fan not work becsuse its not getting the right signal. or is it just to energize the upper stack on the sequencer to supply power to the heating elements? Our Carrier parts program shows a compressor part number SRD480HC scroll compressor. I suddenly heard it running loud tonight. The system supplies chilled water to a college campus with multiple buildings. Or the transformer? Hi Mike! The current decibel reading when running 70-78. 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 never heard of this name brand. Even with that the volt reads 27,28. Yes, The blower wheel could be dirty or off balance and cause a rumbling sound. I think it is because my furnace … Why is the gas shutting off after 3 minutes of burn time. If it doesn’t blow the fuse then the problem is in the defrost board. Hope you have a nice weekend! Running the fan all the time would help prevent the coil from freezing up. I was told to tap something lightly with a hammer in the furnace, but that didn’t do anything. Our email is. Hi Jerry! Most of the time it is from a loose connection. We bought a house last August and the air conditioning was working fine, though the unit is about 10 years old. I took the face of the thermostat off the wall and the unit turned off. Thanks for the great question! 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). Your email address will not be published. Sorry to hear that you are having so much trouble with your heat pump after the siding installation. This sounds like you either have a fan motor problem or possibly a fan capacitor problem. 10108. Thanks so much for the question and solution to the problem. It wasn’t a matter of ‘IF’ this would ever cause a problem, but ‘WHEN’.”, I’m not a heat pump person. Thanks again for your question. A weak capacitor will also cause a fan motor to stop. The fan on the unit wasn’t running. I bought two. Hi Charles! I hope you can easily find and fix the problem. 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 wires..red, 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? Pressure builds back up to about 650psi again and compressor turns off. Wondered if this sounds right to you too? I’m just trying to get by until I have a gas line installed in a couple of months. Spell. Then you know there is your problem, clean/unclog the condensate drain line, place the switch back on the T fitting and “magic” !! I wired the new thermostat just like the old one. Please make sure all the safety controls are closed like the pressure switch and limit. My Aunts ac is having an issue with the thermostat. 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. If you want to send me the unit’s product number I will try and look up the part number for the relay. Thanks Steve. I have a 94% Bryant furnace and I like to keep an ignitor, flame sensor, control board and draft inducer on hand. Steve. I would suggest that you get this checked out with a professional before it permanently damages your unit. I hope you can easily find and fix the problem if you have a problem. Is this the starter capacitor, you think? I do not understand why you only have 4 wires on your old thermostat and why the G wire is not hooked up. I can hear The compressor running one minute and then it just shuts off. “Nothing is more valuable than helping another person succeed!”, We would love to help you troubleshoot and repair your furnace or air conditioner problem! My husband did some troubleshooting and came to the conclusion that we cannot locate the source of power to the AC unit. I would deeply and sincerely appreciate any guidance you can offer. The size air conditioner that your home needs would be determined by a heat gain, heat loss calculation, the size duct work you have and the power of the furnace blower motor. 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. Steve. If the contactor is not getting the needed 24 volts then this can cause the contacts to chatter and burn up quick! 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. This can be dangerous since you are working with live electricity high voltage. Doesn’t freeze inside or out. This is just a solution I found on those 2 stage gas valves controled by a thermocouple and a thermopile . Or could it be bad wiring? My HVAC guy said the head pressure was too high so it was shutting itself down until the pressure stabilized then came back on. I took panel off to see if I could see anything . Can a weak capacitor case this to cycle on or is it likely a control board… or something else? Thank you Steve, the HVAC took the batteries out because they “weren’t need” anyway, my background is HVAC that’s what I did when I was in the military, but haven’t dealt with it for a few years. No change in cycle. Hi! Is there something I might check without having HVAC exp.? Is it the thermostat going bad and eating batteries, or is there something more? I have seen other vibration noises on Goodman units that are caused by having loose heat exchanger mounting brackets. I began to think it was the thermostat, but one repairmen claimed my thermostat is fine. I think this may have "weakened" something on the board. To get the furnace to work with the new control board simply reverse two wires when connecting them to the new control board. I would suggest that you call your HVAC contractor back out and have them find out where the problem is and fix it. Hi Keith! 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. The contractor wants to eliminate the outside electrical box. Thanks for asking this important question! It even does it with the thermostat turned to the off position. HVAC.com 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. Find a local hvac school. Make sure the breaker is OK and working by testing it with a volt meter. It is obvious as you say that the thermostat is losing power. Hope you have a great day! 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. Steve. Not enough refrigerant in the system. I hope you can find an easy solution to the noise problem. Hi Robert! The thermostat wires from the thermostat usually junction inside the indoor air handler. The blower won’t come on even if I turn it from auto to on. (6) O (orange) goes to the reversing valve on the out door unit. I have had two repairmen come out and when they leave I think the problem is fixed only for the problem to occur again a few days or a few weeks later. I have a 5 amp control fuse blowing in my furnace, killing the themostat. does it even pass 24 volts to the contactor,?? Steve. My guess is that the coolant is not equalizing quickly enough, and I don’t have gauges to confirm this. If the main power to your air conditioner is ever disconnected for more than three hours, turn off the thermostat. If it does start making the difference in the high and low side again then I would recommend having the refrigerant charge checked out. I am sorry, but I do not know anything about the Riello 50 f5 you are have installed. Best of luck in finding and fixing the problem. I always liked troubleshooting electric furnace’s with an amprobe which shows the amps running through the wires by just clamping around the wires. Please click here if you are interested in the Gallo Gun drain line cleaner. I hope you can easily find out what the problem is. I googled that question and saw one person type a response that stated “the coil can be removed from its drain pan, the cover sheet/plates removed. Use our online practice test to help you study for the general knowledge HVAC certification exams. I would suggest testing to make sure the “G” connection (24 volts between the G and C com) on the thermostat is being energized when in emergency heat. But, I’m not getting 24 volts coming out of the board which is not providing 24 volts to the contractor. What do you recommend in order to find the source of power if it may be hidden somewhere behind existing structures… we are not in a position to pay an arm and a leg for someone to come by and get into an involved project if it’s not necessary. This happened last year a few times, this year it is much worse – is happening daily. The model number should be located inside the furnace near the burners. I hope you have a nice day! Notify me of new posts by email. Hi Jaron! It’s blowing fine, just louder than it was last year. Help! Does lumber sound right for this application? I hope that maybe someone who reads this might have an answer. Test the controls to make sure they are staying closed when the furnace shuts off after the 3 minutes. You might want to make sure the capacitor is in good shape by having it tested at a local appliance parts store. The AC is rather new. So they do not recommend utilizing the two-stage AC with a single stage furnace or air handler. Sure enough, he got it working again after 20 years of service! You will need to possibly get under the black insulation and feel the bare copper line. I noticed that when i turned breaker back on one of the two heating coils under the fan comes on and stays on for a minute then clicks off, even while in A.C. mode. Take a Free Practice Test on HVAC Basic Electrical Questions -1 ) Leave a Reply Cancel reply. It would depend on what the installations instructions are for your Rheem furnace say. Thankfully, no fire. If you hear your contactor chatter then please find out what is causing the low voltage problem soon, because this chatter will cause a contactor to fail soon. When the compressor motor windings melt this contaminates and produces acid in the system. Between red and black would be 220 to 245 volts and between red to white and black to white would be 120 volts. 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