Immergas Flow Sensor / Flow Switch Fault (DHW or Heating)

Display shows 41, boiler may start and stop rapidly, unstable heating

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

Stuck flow switch, Faulty turbine flow sensor, Debris in flow sensor body

Safety: Isolate water supply and power before removing any water-carrying components.

Steps:

1. Observe DHW behavior: If the burner does not start when a hot tap is opened, the DHW flow sensor may not be detecting flow.
2. Clean inlet filter: Many Immergas units have a mesh filter at the cold water inlet. Isolate, remove, and clean it.
3. Technician service: Remove and clean or replace the flow sensor or flow switch. Ensure correct orientation and seals.

Medium 3/5

DHW Flow Sensor / Flow Switch

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