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Repair guides and support for gas and electric hot water tanks, boilers and household heat exchangers.

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boiler does not kick,s on despite pilot is on and thermostat up

i do have W Mclain force hot water system boiler in the house.pilot is on, thermostat all way up and i do have 120V on T1&T2 in relay but nothing happens

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Most Helpful Answer

Pressure Switch

The pressure switch closes when the proper airflow is achieved, signaling the control board to continue the ignition process. If the pressure switch is defective, the ignition process will stall, and the water heater will not light.

Thermocouple

The thermocouple detects the pilot flame. If the thermocouple does not detect a flame, the ignition process will stall, and the burner will not light

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this is force hot water system.pilot is on so thermocouple is ok

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