FLASH OFF ON High
Your boiler has shut down because it has become too hot and needs to be safely reset after cooling down.
Technical description: Overheat lockout
Typical repair cost: £100-280 (including labour)
DIY fix possible
Turn the boiler thermostat knob to the 'OFF' position.Wait at least 10 seconds for the system to acknowledge the reset.Turn the thermostat knob back to your desired temperature setting.
Protect yourself from future repair bills
A boiler cover plan would cover faults like FLASH OFF ON — no call-out fees, no surprises.
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Parts commonly replaced
- Overheat Thermostat
- Circulation Pump
- Thermistor
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