24
May
Furnace Pressure Switch Open With Inducer On. Hi I have a Nordyne High Eff furnace. 5 a slow draft inducer that might need a new capacitor or has slowed down. Your vent could be stopped up with a birds nest wasp nest or debris. The pressure switch is a normally open switch that closes upon the manufacturers specifications for required negative pressure.
Replaced circuit board white rodgers 50a50-241 inducer motor comes on then get 3 fl read more. Pressure switch stuck open replaced pressure switch still getting 3 flashes wich means pressure switch stuck open. The pressure switch closes when the inducer establishes a draft through the heat exchanger and up the flue. If you have found that your pressure switch is not letting your furnace come on. Watch this and we might be able to get it working again. If it cannot create a draft the switch will not close and the furnace will go into.
Furnace diagnostics indicate pressure switch open with inducer on What could be the problem.
Now use the ohmmeter to check whether the pressure switch is functioning properly. If it cannot create a draft the switch will not close and the furnace will go into. The switch is there to prevent the furnace from running unless the correct venting air pressure is present. Next take off one of the power hoses and blow on it. On newer furnaces on a call for heat The IFC checks the pressure switch. Replaced circuit board white rodgers 50a50-241 inducer motor comes on then get 3 fl read more.