The pressure switch on a furnace may fail or get stuck in an open position and there are few simple checks you can complete before testing the switch.
Rheem water heater pressure switch stuck open.
Came home to no heat.
A pressure switch is designed to sense the negative pressure created by the draft inducer motor during the furnace startup and to shut down the furnace ignition if the air pressure is inadequate.
The furnace was loud and caused by the draft inducer.
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If your lennox does not activate normally during the ignition sequence try running a quick bypass of the pressure switch to determine if it is the.
Also noticed the control board was blinking red.
The pressure switch on a lennox g16 gas furnace monitors whether the air blower is in operation.
This is fixed in my prior video.
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The switch activates with air force pushing a plunger in the mechanism which closes the circuit.