Boiler shows E168, often described as a general PCB or power supply fault, intermittent lockouts

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

Unstable mains supply or brownouts, Internal PCB fault on Baxi boiler, Loose electrical connections at terminal block, Moisture or corrosion on PCB

Safety first: Isolate power before removing any covers.

User checks:

Check that the boiler is supplied via a fused spur (not a plug-in extension) and that the fuse is correct (typically 3A).
Ensure there are no obvious signs of water leaks onto the boiler casing.
Power off the boiler for 5 minutes, then power back on and observe.

If E168 returns:

An engineer should inspect the PCB, check for moisture, test supply voltage, and replace the PCB if necessary.

Hard 4/5

Main PCB (Control Board)

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