Grant Fault High
Your boiler has detected a general internal fault that has caused it to stop running for safety reasons.
Technical description: Fault Description
Typical repair cost: £120-350 (including labour)
DIY fix possible
Locate the reset button on the front control panelPress and hold the reset button for 5 seconds, then releaseCheck that your oil tank has sufficient fuel and that the isolation valve is open
Protect yourself from future repair bills
A boiler cover plan would cover faults like Grant Fault — no call-out fees, no surprises.
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Parts commonly replaced
- Photocell
- Oil Pump
- Ignition Transformer
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