F74
FAULT CODE
Glow-worm
Water Pressure Sensor Signal Too High
High Severity
Engineer Required
The pressure sensor is reading above its expected operating range, indicating a faulty sensor or very high system pressure.
Step-by-Step Fix Guide
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Step 1
Do not repressurise the boiler
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Step 2 Engineer only
Call a Gas Safe engineer to test the pressure sensor and system pressure
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.