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

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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.


Posted on Nov 06, 2010

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Posted on Jan 02, 2017

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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

1 Answer

LIght on box inside flashes 4 times on a new propane fill up


If the gas was empty for three days, the furnace may have attempted to start numerous times causing virtually ALL residual gas in the incoming line to be drawn out. You may consider purging the gas line at the clean out cap where the gas line enters the furnace. However, it should have restarted and stayed running after just a few times at the most because as long as the line was NOT disconnected from the main tank, there should be NO air inside the line to cause flame failure.

I'd suggest asking the service company to double check the furnace manifold pressure to ensure there is not a regulator related problem.

Three times this winter (on the coldest days no less) a tiny droplet of water froze internally of the regulator right on the orifice blocking gas flow.

Feb 16, 2015 | Intertherm Gas Furnaces - M1GB-056-AA

1 Answer

Intertherm M3rl080A BW furnace that shuts down will no indication of fault


If your diagnostic indicator is not picking showing a fault code than it thinks everything is ok with the furnace. It could be a bad thermostat. (or the heat anticipator in the thermostat).

Jan 30, 2014 | Intertherm 56000 Btu Gas Furnace

1 Answer

Intertherm furnace model # MMHB-070ABHR-06 red light blinks two times


Number of flashes mean different things for diff models. The meanings of those flashes should be posted somewhere on the unit; usually inside front of the bottom service panel. Though you can't truly diagnose a problem by number of flashes they can give you an idea of where to look for a problem. There are a ton of videos and how-to's about furnaces on youtube by real service techs. Most modern furnaces have basically the same set-up and features so don't worry about your paticular brand; but of course that would be the best place to start looking. You could start here to familiarize yourself with your brand of furnace:

http://www.youtube.com/results?search_query=Intertherm+Gas+Furnace+&oq=Intertherm+Gas+Furnace+&gs_l=youtube.12...62316.62316.0.63907.1.1.0.0.0.0.202.202.2-1.1.0...0.0...1ac.Ko9QBdxK6OM



And then here:


http://www.youtube.com/results?search_query=gas+furnace+won%27t+light&oq=gas+furnace+won%27t+light&gs_l=youtube-reduced.3..0.5619.10061.0.11544.11.5.0.6.6.1.741.1982.0j1j2j5-1j1.5.0...0.0...1ac.1.5-0zJyxNMEo



Hope this helps.

Dec 21, 2012 | Heating & Cooling

1 Answer

When I turn on my furance or ac the blower is always on even though the fan is set to auto. When it is on heat it never gives off any hot air, so it never warms up the house. I had someone look at it and...


If this is a mobile home furnace they usually have a two stage gas valve. Generally they just have a delay in opening fully and are convertable from L.P to natural gas or vice versa. It is a possibilty that the gas valve is bad. If so it will have to be replaced. First I would have someone check your thermostat to see if that is what is causeing the blower to run . does the burner ever light? I wouldsuggest that you hire a service tech. who is knowledgable on intertherm furnaces. I don't recommend anyone who is not trained to change gas valves,because of safty concerns. I hope this helps you some. Thanks

Nov 12, 2010 | Intertherm Heating & Cooling

1 Answer

Intertherm furnace won't work


sounds like inducer problem cannot open presure switch so shuts off on safety

Apr 29, 2009 | Heating & Cooling

1 Answer

Furnace starts properly, then shuts down, led flashes 8 times


The first thing to look at is the flame sense rod.
Shut off power to the furnace, remove, clean sensor with steel wool or sandpaper then reinstall the sensor. Reapply power and it should run properly.

Jan 10, 2009 | Goodman GMS90703BXA Heater

2 Answers

Intertherm gas furnace model number m6bb070abfc01


Check for a open limit switch caused by a dirty filter or poor air flow

Dec 24, 2007 | Intertherm P3RA-048K Air Conditioner

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