E78
FAULT CODE
Baxi
Water Pressure Sensor Fault
Medium Severity
Engineer Required
The electronic water pressure sensor is giving an incorrect reading. The boiler cannot verify the system has adequate water pressure.
Step-by-Step Fix Guide
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Step 1
Check the analogue pressure gauge if available — the digital and analogue readings should agree
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Step 2
If the pressure gauge shows normal pressure (1-1.5 bar) but the boiler still shows this fault, the sensor itself is faulty
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Step 3 Engineer only
A Gas Safe engineer will need to replace the pressure sensor
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.