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Intertherm My home intertherm unit will only run on aux heat. We have replaced the compressor and the fan relay and nothing has changed. What else could it be? Thank you

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Is the contactor engaging? Make sure it is getting 24v. If not, check the low pressure safety, outside thermostat (if you have one) and the defrost board. Follow the low voltage from the thermostat to all these controls, up to the contactor. Check the thermostat too. If you need a walk through I can help, if you have a volt/ohm meter.

Posted on Mar 02, 2008

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Hi, if the unit had a leak in it, was the leak located and repaired? Did he check the pressures in the unit now? If it switches to the aux mode ( Heat Strips ) is normally caused when your primary unit, compressor and freon are low on charge. I would have that checked.
Sincerely,
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Hi, the schematic would be in the indoor unit, but I am assuming its gone since you are looking for the ladder schematic for the heat strips and fan control. You might try this number for a schematic, 1-888-441-6942, Route A/C and they may be able to help you on this diagram. The number you are showing does not look like any model number at all. For both the indoor and outdoor units on the Intertherm, would look something like this...., P3RA-024k for the model number, and the serial number would be right below it. Both should be very easy for you to locate. It is very hard to find schematics for units once they are gone, as some tech's like to take them off units to go home and try and study them!!, unreal! Makes it hard to troubleshoot when you need it. Try to find numbers like I have noted, and call this number as they will answer questions you may have concerning yours. I hope the best for you and would like for you to rate me, as I know you will be kind. Please keep me posted on this as maybe I can help you solve this fan relay problem you have?
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Set the heating system on aux heat only. Fan should not be on, if it does stay on after a heating cycle, see if the furnace is heating normally, and reaching temp as desired before the heat comes off. Then check the therm wiring, pull the face of the therm, disconnect green wire (fan) and try the heating again.

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