BoilerFaultCodesPotterton E168 Fault Code
The Potterton E168 fault code means: your boiler has detected an internal electrical error that is preventing it from running safely, and it usually means the main control board is confused or failing.. It appears on 1 Potterton model in our database.
Technical description: Printed circuit board (PCB) lockout
What causes the Potterton E168 fault?
This fault occurs when the boiler's internal computer becomes confused or fails to monitor its own electronic signals correctly. The most common reason is a failing printed circuit board (PCB) that can no longer communicate with the boiler's components, often triggered by power surges or aging electrical components. In some cases, external electrical interference from a faulty pump or loose wiring can also cause the system to shut down for safety.
DIY fix possible
Turn the boiler off at the main electrical switchWait 30 seconds before switching it back onPress and hold the 'Reset' button for five seconds
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Gas Safe Register →Potterton models that show the E168 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E168 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026