Question about Intertherm P3RA-048K Air Conditioner

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Furnace has does not ignite flame

I have a intertherm furnace model #m1mb77ab its alittle over 2 years old sometimes the flame will not ignite it the red light flashes 1 time meaning limit switch is open sometimes it flashes 2 times meaning pressure switch is open were are these located

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How often do you replace your filter?

On the limit switch that protects your unit when it gets to hot the number one reason is dirty filter.

The pressure switch is located in the upper side of cabinet has a rubber hose connected to it. They very rarely go out though. So find your vent fan the first fan that comes on and follow the rubber hose to the switch.

Posted on Feb 11, 2009

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Posted on Jan 02, 2017

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Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)

Check the gas pressure, make sure you are getting 11 to 14 PSI.

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

Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.

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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recommend getting a carbon monoxide indictor or having some one test it. with it being over 15 yrs old if checks good replace ignitor assy should fix it ok

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Intertherm is a Miller furnace. Google your model number or Miller Gas Furnace.

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