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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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Posted on Jan 02, 2017

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2 Answers

Replaced contactor,run capacitor,still no joy . Contactor kicking in unit not running. Intertherm model s3ba- 036k


How about high voltage? If you do have high voltage test for continuity on your compressor. If continuity then ohm out compressor, common to start + common to run = start to run!!

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

May 07, 2018 | Intertherm Heating & Cooling

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Intertherm MGHA-070ABFC-05 will not run/cool


Multiple problems. Eliminate thermostat first. Remove face from wall and turn on breaker. If fan still runs you have a bad board or bad relay. If fan outside is running compressor should be too. These operate on same contactor. Verify you are getting 24 volts to coil side of contactor. If odf stops working and contactor remains pulled in you have a bad motor. If odf motor stops working the compressor will shut off due to overheating.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

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Blower? Internal house air blower I assume. - Blower relay contacts pitted and stick in on position.
BAD Control BOARD, fault or adjustment program keeping relay energized. Bad emperature sensor not telling Board unit has use up cold air. loose wiring to sensors and board connections

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I have an intertherm rpbmb030k combo a/c and heat. Had frion put in the unit over the summer and a new digital thermostat. Unit has worked great until we needed heat. Unit works great on aux. heat but...


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,
Shastalaker7
A/C, & Heating Contractor

Dec 03, 2010 | Intertherm P3RA-060K Air Conditioner

1 Answer

I have an Intertherm split unit A/C and electric heat I need a ladder diagram for the indoor fan relay and I also need to know which part number it is my intertherm model number is e2ebo15hb any help would...


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?
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

Sep 18, 2010 | Intertherm Heating & Cooling

1 Answer

Ruud air to air heatpump intertherm propane furnace honeywell th5220d non programable thermostate.fan on furnace will not turn off in aux.mode even though the furnace heat kicks on and off. thank you for...


Make sure fan relay is wired correctly (G) wire. Ensure the fan on therm is not on, it should be on Auto or off.

If your furnace is short cycling because it has to keep heating your home, the delay in the control board may be staying on to compensate for the exchangers getting hot. If it heats normally, then put your attention to your thermostat.

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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1 Answer

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I changed the control board and that solved the problem.

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