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My Intertherm, electric ignition furnace will hum and hum but not click on. There are two yello flashing lights until we reset it by turning off the gas and turning down the thermostat. The unit resets itself and I get a steady red light when its working. Is this a pressure switch issue?

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That blinking yellow light is an error code. If you look behind the main cover there will be a wiring diagram and error code chart. This will give you an idea what the problem is.

Posted on Nov 07, 2008

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by igniter I assume you mean the thermocoupler. are you turning the control button to run after you light the pilot light? Normally when those furnaces quit it is the thermocoupler that has quit. Get a new one and leave it in the furnace compartment as a spare.

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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



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Dec 21, 2012 | Air Conditioners

1 Answer

Have a carrier 92 furnace. electric motor will not kick on...just hums. red light on circuit board flashes...help?


see this causes and fix it. God bless you
If the furnace won't run, check the electrical service panel for a blown fuse or tripped breaker. Also make sure the power switch on or near the furnace is turned on. Check the unit for a reset button and try it. Some units have a built-in breaker or fuse panel.
However you can have a missing 1 phase , test with the VOM, for to measure voltage. Or motor need repair for winding trouble,bearing.If you do not have enough experience call some electrician.
God bless you

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1 Answer

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Hi, you will have a chart glued to a panel with a list of codes per flashes telling you what to check with 4 flashes. Read this and get back to me on what is is telling you.
Robert Horton

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how often do you replace your filter?

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You need that after the regulator all the way to the manifold.

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Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.

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Dec 03, 2008 | Intertherm Air Conditioners

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