Having problems with your Air Conditioners ?

AC, Fan-Auto, Fan-On... nothing works. the request from the Thermostat doesn't engage anything. Thermostat Dispay works. How do I know if it is getting the 24volts from the relay? I presume the display wouldn't work if the 24v from relay wasn't there. I have two separate systems in the house. So therefore, I pulled the thermostat off the base and tried it on the faulty system. No luck. Still same issue. Perhaps it's the Honeywell base itself? what electronics are in there that could fail? How ca


Answers :

Open the air handler. Locate the low voltage transformer. One side is 220 volts input. The other is 24 volts output. Take your VOM and touch the test leads to the input to verify 220v in. Then touch the other 2 leads to verify 24v out.
If you have power in and no power out, replace the lv transformer.

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AC, Fan-Auto, Fan-On... nothing works. the request from the Thermostat doesn't engage anything. Thermostat Dispay works. How do I know if it is getting the 24volts from the relay? I presume the display wouldn't work if the 24v from relay wasn't there. I have two separate systems in the house. So therefore, I pulled the thermostat off the base and tried it on the faulty system. No luck. Still same issue. Perhaps it's the Honeywell base itself? what electronics are in there that could fail? How ca


Open the air handler. Locate the low voltage transformer. One side is 220 volts input. The other is 24 volts output. Take your VOM and touch the test leads to the input to verify 220v in. Then touch the other 2 leads to verify 24v out.If you ha ... Honeywell Air Conditioners

I have a Rudd natural gas heater and central air system. The Air has been working fine all summer and now nothing works ,AC,heat and even the fan does not work. I tried changing the thermostat with no luck. Any suggestions. Thanks


Check for power at unit, as it may be the disconnect fuse/breaker. The only other thing is the main board, but it sounds like there is no power to the unit. I hope this helps Tim ... Ruud Air Conditioners

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We installed a Honeywell RTH230B thermostat on a Trane XE60 Air Handeler this winter. When we put the system on heat it works fine. However, when we put the system on auto for cool the compressor fan comes on but not the air handeler fan. On the air handeler the terminal strip from left to right is R W Y G B/C. The red wire on the R terminal comes from the contactor on the compressor unit. The other wire from the compressor unit is connected to a gray wire that goes to the thermostat. The W


I ran into this before and had to call Honeywell for help in the wiring...it seems the wiring was not done to standard, and they were able to help me get it straight in about 10 minutes and at no charge. ... Air Conditioners

A Nordyne air handler, model B3BV-030K, with 4 wire thermostat. Thermostat and AC works fine in "cool". Switch it to "heat" and nothing happens.No fan, no heat.(I have built in heat strips -resistors). I jumpered (on the nordyne circuit board-input from thermostat) from R to W. (24 volts from R to W, which should start the heater. Nothing. No relay "click" like when AC comes on. If i jumper R to Y, AC comes on ok. Does this sound like a relay gone bad on the circuit board? Or what? If relay bad,


Do you get heat when you jumper R, G & W? ... Ruud Central System Air Conditioner

A/c fan not working=thermostat is working(central a/c system)a/c


The fan on the outside unit is powered from it's 240 volt source. Check that the breaker for the outside unit is not tripped. Also, a contactor is inside the outer unit that starts the fan - it may be faulty. ... Friedrich QuietMaster Electronic SS12J30D Air Conditioner

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It sounds to me like you have a delay on start timer on the compressor that possibly is starting to fail or someone may have adjusted the time band up on it. I myself would remove it and install a delay on break timer and a 5 minute setting would be ... Air Conditioners

I have a problem with my heating system. It is about 10 years old and has had the ignitor, combustion blower motor, and programable thermostat replace in it's lifetime. The system worked great last year. This year has not been so good. The system was checked and cleaned last month. What is happening is the blower kicks in and the burner cut off after a few (15-20) seconds. I tried shuting down system and turning off power to reset. When you turn heater on this is what happens 1. Combustion fan c


Sounds like its not proofing flame. it has a sensor usually like a needle sticks out into the flame that tells the gas valve the flame lit and is burning so its ok to keep sending gas, if its fails to proof flame then burner shuts down, then it tries ... Air Conditioners

The heater was working fine when we went to bed but in the morning we got up to find it had stopped working even though the thermostat showed the heat to be on.We checked the pilot flame and it is on.It is a reverse cycle Brivis Buffalo system(1984) model.The fan is alo working fine.


This is too deep to explain, so its best to call a service tech, with all his diagnostic tools Thank-you-very-much! ... Air Conditioners

I have a heil -- model NUGK100DH12-- problem is when power is supplied to it the blower fan comes on right away along with the induction blower and it does have the electronic pilot which all works to thermostat setting. when setting is reached the flame shuts down normally and I think the induction motor cycles correctly, but the blower motor never cycles off. It's on constantly. I tried replacing the fan relay to no avail and am considering replacing the timed fan controller as the next move


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I have a Duo-Therm Penguin model#610115405 that cools and the fan changes speed(slower) when the room gets cooled and the compressor kicks out, but the fan will not shut down.I have the same unit fwd in my RV that works fine. I tried switching the thermostat,ptcr relay and the capacitor that is below the ptcr. Any other suggestions ? Dont see anything that else that I can easily switch to check.Still not shutting down?


Hi,\015\012the relay that is suppling the power to the fan is welded shut and is not opening. This often happens with relays, the contacts get pitted and then they heat up and weld fast. The relays that run the fan faster and slower are still w ... Dometic Rooftop RV Air Conditioner

My rv duo therm 590 series qquick cool with relay kit 3104998 will not blow cold air both fans are working, suspect system needs recharging.. how do you recharge the system


... Dometic Rooftop RV Air Conditioner

Compressor intermittent Compressor doesn't always come on. Sometimes I have to turn system on and off several times, Uses Duo-Therm 4 button thermostat. When it is working with fan on high, if I reduce speed of fan, compressor will stop.


Sounds like a bad thermostat. Make sure you turn off all related breakers and disconnect switches before attempting to replace it. Good Luck! ... Dometic Rooftop RV Air Conditioner

I have a dometic roof top a/c for a travel trailer, model #59516.731G when the relay cuts on to cool it would make a loud buzzing sound but would function the way it should. freezing over sevral times. Untill yeasterday, the relat wont cut on to cool at all now. fan motor on both fan & a/c sides lo,med, hi still work. would this mean the thermostat has gone out? thanks for any and all assistance you can help with charles


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I have a Goodman CPLE42-1 split system. I had a power outage and my first floor unit would not cool anymore. The air handler/blower in the ceiling is working fine, but the fan outside is not turning on. When I went to look for an overload reset on it, I switched off the breaker on my second floor unit by accident, and now it is doing the same thing. Both fans on the outside will not turn on. Both thermostats will turn on the air handlers in the ceiling. Seems like I re-created the same exact pr


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Duo Therm 58935.602 Will not turn on with thermostat, but when wires are crossed at unit, both compressor and fan work fine and unit works, replaced 2 relays and transformerd


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Amana PTAC Unit is not producing heat. Fan works fine. can not locate manual reset for heat although a label on the unit says there is one. I have an Amana pth153b35ae ptac unit that the heat will not come on. The compressor will run in the cooling mode but not in heat mode. I verified the switching valve is working and the capacitor seems to be fine as the compressor will run in cooling mode. The thermostats seem to be functional because relays can be heard clearly when changing temperature se


I know this is late but I had to add a solution to this problem since I had the exact same problem and was able to solve it. The probelm is not your control board. On these units, the heat pump compressor will not kick in unless the temperature you ... Amana PTH123B25AJ Heat Pump Air Conditioner

I have a Coleman Evcon Air Conditioning Unit....for the FAU ...I have to remove both front panels and manually have to turn the fan to get the unit working...my question is....would this be some kind of problem with the relay between the thermostat and the FAU ? when I spin the fan blades by hand...it doesnt seem like it is rubbing...I have never experienced this problem...can somebody please help me??? I would truly appreciate it ! :)


Hi,\015\012\015\012As you rotate the fan blade it start workin.This is not a realy or thermotat problem.The problem is with the motor of the fan.Replace the motor and it will work fine \015\012\015\012Thank You ... Air Conditioners

The outside compressor and fan will not shut off. I have turned the thermostat system to Off and even to heat, but it will not stop. I went on a trip, increased the room temp to 80 on the thermostat and left. When we returned 2 1/2 days later, the coils were frozen and no air was comiing through the vents, even with the blower motor working. So I turned the unit to furnace and melted the ice on the coils, but had to pull the fuses on the outside box to get the compressor to shut off. Is there a


Sounds like the contactor is stuck. That's why nothing will stop the fan and compressor except killing the power to it. You should be able to get one fairly cheap. ... Ruud UAKA037 Air Conditioner

Goodman GSH130301AB heat pump with Braeburn 1200 multi-stage thermostat - both less than 1 year old and installed in new construction. Heat can be set at 60, fan on AUTO, with room temp at 70 and heat will kick on and stay on. When this happens, turning thermostat to OFF does nothing - system continues to blow heat - and I can only shut it off by flipping the breaker. This only happens now and then - typically works fine. All wiring appears to be correct though reversing valve for cooling is


The reversing valve wire needs to be on the o terminal.nothing will be on the b terminal on the thermostat ... Goodman Air Conditioners

The CMC relay will not energize with the correct power going to it. this is a 230v 3 phase 60hz. system and all the correct power is being aplied. Also my condesor and evaporator fan are working propper and i have also replaced the M13 cab control box. All fuses and relays have been properly checked and are good. Any info and trouble shooting help will be greatly apprieated due to the fact that i am in the 101st air born, US ARMY stationed in Afghanistan.


Hi, Wow, wish you were home!! If the CMC relay has the correct voltage to it, I am assuming 230 volt, 3 phase also, it may be your fault. If its energized on a call for cooling, and does nothing, I would say that this is your faulty componant. I don ... Air Conditioners

My rv duo therm 590 series qquick cool with relay kit 3104998 will not blow cold air both fans are working, suspect system needs recharging.. how do you recharge the system


... Dometic Rooftop RV Air Conditioner

I just had a Goodman 4 ton 16 seer system instaled in my home. The thermostat that was instaled is new, but is the old dial type (not programable). At first the tech tried for quite a while to get my original thermostat for a ten seer system to work. I was told that a 16 seer system required a special thermostat. I guess my question is would it be possible to rig the new system to work with a regular old thermostat???


Here is a link to the manual for your unit. http://www.ecoairandwater.com/store/files/pdfs/g-SSX_manual.pdf\015\012\015\012Here ... Goodman Air Conditioners

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