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Posted on Jan 02, 2017
SOURCE: On a 80% Rheem upflow
Hello ANGUS,I think 3 blinks is open pressure switch,try taking the door off the furnace.The upper left hand side is a round black box with a hose attached to it .Gently tap the switch(box) and turn off power for 2 seconds andback on,then call for heat.the blower door has a sticker inside that tells you just what the blinks mean.
Posted on Aug 10, 2010
If the blower motor runs continousley and the thermostat is not set to fan then the intergrated control board is malfunctioning and must be replaced. Usually because the relay that energized the motor is bad. If you are refering to the inducer motor running all the time then the pressure switch is open and must checked for a restriction in the flue pipe or blockage in the vent.
Posted on Jan 17, 2011
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