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Intertherm furnace fan will not turn off. - Intertherm Heating & Cooling

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  • Intertherm Master
  • 1,363 Answers

Check relay, make sure thermostat in auto position

Posted on Sep 16, 2015

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 25 Answers

SOURCE: FURNACE OR AC WONT TURN ON

to see if it is the t-stat or the system you can unwire the entire t-stat and jump out the wires. never touch the blue to any other wire or you will blow the low voltage fuse on new board. if you jump red to yellow and your condensing unit cycles on the t-stat is wired wrong or wrong style. If not go check the yellow wire at cond. unit and see if power is even going to it.

Posted on Sep 24, 2008

  • 85 Answers

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

farfield
  • 462 Answers

SOURCE: intertherm furnace model MGHA070AAFC-01 cuts on and off

I assume this is a gas furnace? If so its most likely your fan switch. This is set to come on after the "Chill" is gone on the furnace and go off a few moments after the flame cuts off. there are several different kinds but you will find it if you trace the wiring from the fan motor (usually the colored wire red, blue, or yellow and NOT the black or white or brown) goes to it. If the colors are hard to see use a good lite and some alcohol to clean them up some.

Hope this helps and please rate me accordingly Good Luck.

Posted on Mar 12, 2009

bobicehouse
  • 1524 Answers

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

Sounds like a problem with the circuit board.

Posted on Apr 23, 2009

  • 6 Answers

SOURCE: I have an intertherm electric furnace FEH-A020,

The model of T-stat you gave comes up as a discontinued model on Honeywell's web site, but it looks to be a manual stat that type of stat would have to be wired with a summer winter switch with electric heat, allowing it to turn on the fan with a call for heat. If yours is a programmable T-stat you would need to select electric heat or in the installers set up change the default setting for fan from unit controls fan in heat to thermostat controls fan.

Posted on Nov 02, 2009

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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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