Display shows E12, unit may behave erratically or not respond to controls.

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

Internal failure of Baxi main control PCB, Corrupted firmware, Loose internal connectors between display board and main PCB, Electrical surge damage

Safety: Disconnect power before opening the control compartment.

Steps:

Power cycle: Turn off power for at least 30 seconds, then restore. Sometimes transient faults clear.
Check internal connectors: Remove the front panel and carefully inspect ribbon cables and plugs between the user interface board and main PCB. Reseat them firmly.
Inspect for damage: Look for burn marks, swollen components, or water ingress on the PCB area.

Professional: PCB replacement and firmware updates must be performed by an authorised Baxi service technician.

Professional Required 5/5

Main Control PCB

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