Question about Heating & Cooling
3 blink on the board i replaced pressure switch and its still blinking 3 times callin a pressure switch issue??? please help
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Posted on Jan 02, 2017
SOURCE: pressure switch problems
This is a air proving problem. You need to check your flue for obstructions like birds nests, rodents, snow, ice, etc. The inducer motor creates a draft that is proved by the pressure switch. This will not make if there is a restriction somewhere.
Posted on Oct 07, 2009
had similar problems with same furnace. I think the 3 blinks is high limit event. either way with the power off to the furnace remove the board from the 4 clips holding it on one at a time then turn it over and look at it you will be able to tell if the board is bad because it will appear scortched and the resin will be bubbled up where it went bad. replace board and you will be fine. went through 2 in 2 years all of a sudden they are being made by a different company from the original and the 1st replacement. now all is fine. Take a good picture of the board close up so you can reconnect all the wires properly. Friend of mine got it from a wholesaler for $55.00
Posted on Dec 12, 2009
Testimonial: "The circuit board was definately the problem. Got it replace (still under warranty) with an updated board and everything is working great. Thanks!"
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