Boiler displays E168, often described as a general PCB or power supply fault, with intermittent lockouts.

Safety Warning

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 the terminal block, Moisture or corrosion on the PCB

How to Fix / Troubleshooting

Safety first: Isolate the power supply 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 the supply voltage, and replace the PCB if necessary.

Repair Difficulty

Hard 4/5

Required Part

Main PCB (Control Board)

Check Price on Amazon

We may earn a commission from links on this page.