Question about Intertherm P3RA-048K Air Conditioner

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Intertherm furnace fan will not turn off. - Intertherm P3RA-048K Air Conditioner

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Truck relay

Posted on Sep 16, 2015

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Posted on Jan 02, 2017

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SOURCE: ruud air to air heatpump

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.

Posted on Dec 06, 2008

bobicehouse
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SOURCE: Intertherm model MGHA-090-AAPQ -- combustion air keeps running

Sounds like a problem with the circuit board.

Posted on Apr 23, 2009

dj_relly999
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SOURCE: Outside unit will not turn

Hi! You may want to start on having the power supply checked. Good cause why the unit won't power up. Have the compressor checked too just to be sure.

Posted on Sep 15, 2010

  • 571 Answers

SOURCE: intertherm furnace M1BG wont fire

Make sure the gas valve is turned to the ON position after you had it in PILOT position. Also check the thermostat low voltage wiring @ furnace...jumper the Red & White wires to bypass the thermostat temporarily. Make sure there is 24 volts on you low voltage circuit.

Posted on Dec 16, 2013

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Furnace ignites, fan runs but no output to vents. Does it have an dampener? Internal


If you are positive the fan is turning and no air flow you have a very dirty filter or all zone dampers are closed (very unlikely because most zone dampers fail in open position).

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Intertherm furnace M1BG wont fire


Make sure the gas valve is turned to the ON position after you had it in PILOT position. Also check the thermostat low voltage wiring @ furnace...jumper the Red & White wires to bypass the thermostat temporarily. Make sure there is 24 volts on you low voltage circuit.

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Generally a control module won't diagnose that it is bad. The fan switching in heat mode occurs via timer in the board. So either run the fan on all the time from the thermostat, or replace the control module.

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Intertherm furnace/AC, fan on the furnace won't shut off.


How old is the intertherm. The old ones have fan limit switch and sometimes they stick. The new ones have a fan baord or time delay relay. They go bad from moisture and they just go bad sometimes. It sounds like you just have a shorted relay. If you think you can replace it you can get a relay at any parts store. Need the model number of unit. If not just call a service tech for free estimate. Russ

Jul 24, 2009 | 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.

Dec 06, 2008 | Intertherm Heating & Cooling

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