E78
FAULT CODE
Potterton
Water Pressure Sensor Fault
Medium Severity
Engineer Required
The water pressure sensor is giving an incorrect reading. May indicate a blocked or failed sensor.
Step-by-Step Fix Guide
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Step 1
Check system pressure is correct
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Step 2 Engineer only
If pressure is correct but E78 persists, the sensor may be blocked or failed — call a Gas Safe engineer
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.