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I have a intertherm furnace modle M1MB 070A BW, and my problem is that it is not working it says that the pressure switch is open and i tried cleaning the filter and nothing, tried takein the swtch out the lupe by adding a wire lupe and it said it was fine but no fan kick in and the fan does work and so does the air conditioning so please help me!!!!!

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Posted on Jan 02, 2017

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SOURCE: What kind of filter does

IF the unit has a louvered front panel, the filter is attached to that. Take the front panel off and you should see it on the back of the panel. The size and specifications are on the filter.
See this diagram. IT has a manufacturers number for the filter but it wont tell the size:
http://www.batchelorsupply.com/Nordyne/Furnaces%20-%20HUD/M3%20parts%20list.pdf

Posted on Nov 28, 2010

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SOURCE: just replaced pressure switch on intertherm m1mb

CHECK FLUE FOR OBSTUCTIONS AS WELL AS COMBUSTION AIR INTAKE FIRST. THEN CHECK TO SEE IF THE FURNACE DRAIN IS OPEN AND NOT CLOGGED [ONLY IF YOUR FURNACE IS A CONDENSATING HIGH EFFICIENCY MODEL, typically the flue pipe will be 2 or 3 inch pvc pipe] over the years more often than not, it is an obstruction or poor drainage which will not prove the pressure switch to allow the burner to ignite. in rare cases the furnace control board could be bad as well.TRY DISCONNECTING FLUE AND COMB. AIR AT FURNACE JUST TO SEE IF FURNACE WILL IGNITE. HOPE THIS HELPS!!!!!!

Posted on Dec 12, 2011

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how often do you replace your filter?

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