F15 High
Your boiler is not receiving enough electricity from your home's power supply to run safely and has shut down as a result.
Technical description: Supply voltage under 170v – electric supply problem – the electrical system needs checking
Typical repair cost: £90-250 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F15 — no call-out fees, no surprises.
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Parts commonly replaced
- Main PCB (Control Board)
- External Voltage Regulator
- Wiring Harness
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