5P1 High
Your boiler is struggling to light its flame or detected a failed start, which may be due to a temporary issue with the gas flow or ignition.
Technical description: All Boilers
Typical repair cost: £100-350 (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 5P1 — no call-out fees, no surprises.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Ignition Electrode
- Flame Sensor
- Gas Valve
*Affiliate links — we may earn a commission at no extra cost to you.