Immergas Air Pressure Switch Stuck or Not Changing State

Furnace shows 40, no operation, may be related to fan proving or air pressure

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Pressure switch stuck closed or open, Blocked pressure tubing, Incorrect flue configuration

Safety: Turn off power before working on internal components.

Steps:

1. Inspect pressure switch: Check that the switch is mounted correctly and that tubes are connected to the correct ports.
2. Clean tubes: Remove and blow through tubes to clear any blockage. Ensure no water is present.
3. Technician test: Use a multimeter to verify that the switch changes state when the fan runs. Replace the switch if it does not operate correctly.

Medium 3/5

Air Pressure Switch

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