Question about Intertherm Heating & Cooling

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I have an Intertherm MGHA 090 furnace. It runs short cycles never reaching temp. When the blower motor shuts off, the combustion motor stays running. If I leave the door open the furnace stays on.

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  • Intertherm Master
  • 44,232 Answers

That sounds like you may have a bird or nest in the vent pipes .

Posted on Dec 09, 2016

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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

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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.

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It sounds like the flame sensor is bad. If thats not the case you may need to replace the control board. You should make sure the flame sensor is directly into the flame.

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Furnace kicks out every so often, ran for two days this time, then kicked out on a pressure switch open, i have replaced the combustion motor ,pressure hose ,and pressure switch, runs for a while then...


You are going to need a service man. A magnehelic gauge is needed to properly diagnose a pressure switch issue. Could be a blocked or restricted flue, a defective induced draft motor, cracked heat exchanger, restricted secondary heat exchanger, ect. ect.

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My furnace will not reach the desired house temperature in one cycle. It will run for several minutes, shut off, and repeat. It eventually reaches the desired temp but it take a long time and I feel it...


There are a few different reasons for short cycling of a furnace.
1. Inadequate air flow. Not enough air moving through the furnace can cause it to overheat and trip the high temperature limit switch.
check to see that all registers are open and returns are not blocked.
2 Improper heat anticipator setting on thermostat. Some thermostats have a heat anticipator and too low of a setting can cause short cycling.

4 Partially blocked drain hoses. If the condensate backs up into the furnace it can shut the flame off and then when the condensate drains the furnace starts again. Check all drain hoses to make sure they are clear.
These are just some of the possible reasons for short cycling .
Hope this helps.

Dec 26, 2013 | Heating & Cooling

1 Answer

My furnace heats up and then shuts down not kicking on blower


Your furnace is shutting off on the high limit switch because of this. You are having a problem with the blower motor. You need to check for power from the wires on the board that feeds the motor. If you have voltage, and your run capacitor is good, you have a faulty blower motor. If its a fan relay, the fan would start and run all of the time. Check power to motor right after furnace shuts the burners off.
Robert Horton

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My Intertherm furnace will not shut off, the A/C cycles, but the blower runs unless I trip the breaker. I have replaced the t-stat.


It could be a couple of things; since you've already replaced the thermostat it could also be shorted wires from the thermostat to the furnace, or a siezed relay that controls the blower motor.

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1 Answer

A 1979 Colman RV furnace. Blower shuts off shortly after burner shuts off leaving a hot heat exchanger. After 15 seconds blower comes on again blows for 10 seconds shuts off comes on in 15 seconds blows...


The fan limiting switch is acting up. It should stay running until lower temp is reached. It will cycle until the temp stays below or at the low setting. Limit switches are adjustable.

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I have a comfort zone furnace. If it's 50 degrees in the house, and i set my thermostat to 70 or so,it takes at least 24 hours to reach 70 degrees. The furnace starts up and runs normally for about five...


When the thermostat calls for heat it should run until the room reaches the temperature setting then shut off. Is the blower motor running and can you feel air coming out of the vents? It sounds like the blower is either not running or putting out enough air to keep the furnace heating. The blower moves the heat from the heat exchanger to the room, if it can't remove enough heat from the heat exchanger there is a limit switch that will shut the burner off if it gets to hot and that's what it sounds like is happening.

Apr 25, 2009 | Heating & Cooling

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