Tuesday, January 20, 2015

Pressure switch closed trouble code

Hello, I need help on my furnace. First off the thermostat is not get 24v when I tested the W wire....only giving me a 22v reading on the W wire. The other wires seem to be okay... they are getting 27v reading. Also the red light is blinking 3 times = Pressure Switch Closed. Not sure why its closed. What should I check?

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