Boiler shows E22, no burner operation, may occur after power disturbances

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

Damaged main PCB, Firmware corruption, Voltage surge, Loose internal connectors

Safety first: Isolate power before touching internal components.

Power reset: Turn off the boiler at the isolator for several minutes, then restore power.
Check supply voltage: Ensure the boiler is supplied with stable voltage within the specified range. Avoid using undersized extension leads.
Visual inspection: A competent person can check the PCB for obvious burn marks or loose multi-pin connectors.
Professional replacement: If E22 persists, the main control PCB will likely need replacement and configuration by an ACV-trained technician.

Professional Required 5/5

Main Control PCB

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