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Our furnace keeps shutting off the flame due to

Our Intertherm furnace keeps shutting off the flame due to insufficient air flow internally to keep the furnace cool. The fins have been cleaned and the condensation tube has been cleaned. What else can we try?

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Gain access to the flame rods and make sure the orfices are clean - use a can of compressed air/air compressor with a blower nozzle. Make sure there's no dust or debris in the flame rods.

Posted on Feb 07, 2010

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Why does it start, then shut down followed by 3 clicks?


  • Thermostat calls for heat
  • Venter motor starts
  • Air switch verifies vacuum
  • Igniter sparks, or glows - depending on furnace
  • Flame starts in burner
  • Flame rod senses flame
  • Burner continues to burn until thermostat stops calling for heat
By your description, I would polish your flame rod, it will be a metal rod that is insulated from the bracket that is screwed to the furnace case and it will have a single wire attached to flame rod,

Sep 29, 2015 | Intertherm 56000 Btu Gas Furnace

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Furnace won't stay lit. Intertherm Model M2RC-080A-16BN. Ignightor glows, flame starts and after a few seconds the flame shuts off. Then it starts the cycle again. It goes thru this cycle a fe


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.

Nov 20, 2014 | Intertherm Heating & Cooling

1 Answer

Furnace will not run complete cycle ,several clicks and the and the furnace shutdown and restarts, will not bring the house to temperature


If it's a 90%+ gas furnace, check the combustion air pvc pipe for blockage, if not enough air for proper combustion, control board will shut down the flame to keep from burning poorly! Check your air filter, there's an overtemperature safety switch in the heat exchanger to protect the furnace/ your house, and low airflow will cause the heat exchanger to overheat. Finally, check to see if the flames actually ignite, if no flame, the controller will reset and try again, then if no flame, the controller will reset and try again, then if no flame, the controller will reset and try again, then if no flame, the controller will reset and try again.... get the idea? :) If this is the case, check my other solutions, I just answered someone elses question about non ignition. Hope this helps.

Mar 23, 2013 | Intertherm P3RA-048K Air Conditioner

1 Answer

I have a Intertherm MAC 1175. The pilot light was occasionally going out, so I replaced the thermocoupler, which solved that problem. Now, however, after the room reaches the right temperature and the...


Hi, sounds like the MGV is not shutting off all of the way/ That would be the only reason gas would continue to flow, even on a small scale. If this keeps up, change that valve!! Do not take it apart, never! Good luck,
Robert Horton
PS MGV ( Main gas valve )

Oct 31, 2011 | Intertherm P3RA-048K Air Conditioner

1 Answer

Intertherm Furnace keeps shutting off as soon as it comes on. Model # G5RK072C-12


if its a fossil fuel unit meaning nat gas or propane and it lights then goes out in a few seconds try cleaning the flame sensor take out sensor then rub it gently with steel wool then replace should solve problem

Jan 24, 2011 | Intertherm Heating & Cooling

1 Answer

INtertherm natural gas furnace starts up 3 times then shuts down. LIght on box inside flashes 3 times.


I would bleed the lines of air if the unit hasn't run for more than a few weeks.

If the flame starts up, but shuts down, a thermocouple or electric eye is erroneously not reading the flame, and it is shutting down for safety reasons.

If you would provide the model number I will look up more specific technical information, if you desire.

Good luck on this.


Nov 06, 2010 | Intertherm Heating & Cooling

1 Answer

Furnace shuts off once the flame comes on.


You are having problems with your air/fuel mixture. It would be best to call a tech that knows how to work with propane. This type of problem is fairly common when using propane.

Aug 19, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

Intertherm gas furnace


Need more info. Are you saying that when tstat calls for heat then it short cycles. But if you turn it off then back on it runs ok?

Mar 21, 2008 | Heating & Cooling

10 Answers

Intertherm furnace problem?'s


the blower on my furnace keeps going on and off when i turn the furnace on .ichanged the snapdiscs no change changed thermocoupler and therostat still no change whats my problem

Oct 27, 2007 | Intertherm P3RA-048K Air Conditioner

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