Immergas Generic Sensor / Configuration Error

Boiler shows error 40, often indicating a generic sensor or configuration fault.

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

Incorrect parameter settings, Incompatible sensor fitted, Multiple sensor faults, PCB firmware issue

Safety: Only trained personnel should alter boiler parameters.

Reset to defaults: Enter the installer menu (see Immergas manual) and reset parameters to factory defaults if possible.
Check sensor types: Ensure that only original Immergas NTC sensors and accessories are fitted.
Scan for other errors: Some models log additional codes in the service menu. Use these to identify the specific faulty sensor.
Firmware/PCB: If configuration is correct and sensors test OK, the PCB may require replacement or firmware update (where supported).

Hard 4/5

Main Control PCB

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