Question about Heating & Cooling
LED flashing 3times indicating pressure switch problem. What is the fix?
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: MHU45LP won't fire
The pressure switch to which you are referring is the switch connected to the suction side of your induced draft fan. This pressure switch will have a hose connected between the switch and the induced draft fan. Please let me know if you need any more assistance.
Posted on Feb 17, 2009
There is no reset button. The fault will clear itself upon cycling power to the furnace once the problem is corrected. The furnace has to establish air flow before it starts the ignition cycle. Check and make sure that your inducer motor is running during a call for heat and that the flue is free from restriction. eg. bird nests, animals, snow, ice etc.
Posted on Oct 04, 2009
it may be clogged at the barbed fitting on the induced draft motor where the pressuer switch tubing connects. take a paper clip and **** it out make sure you can stick it thru freely till you can feel the Inducer wheel then reconnect and try again.
Posted on Nov 05, 2009
The 3 flashes is an error code. Most likely you have either a vent blockage, the inducer motor is not spinning fast enough to draw a vacuum on the pressure switch, you have a bad pressure switch or a blockage in the hose going to the pressure switch. You can **** lightly on the hose going to the pressure switch to close it or you can jump it out to test it.
Posted on Jan 16, 2010
hi flame sensor is a rod in the flame try cleaning this with some steel wool if not in could be the control box where the sensor conneted to
Posted on Jan 22, 2010
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