3 green flashes Low
Your boiler has briefly lost its flame and is trying to restart itself, which is often a temporary glitch that might resolve without any action.
Technical description: Temporary flame loss. Boiler will self reset, if fault continues you will see 3 red flashes.
Typical repair cost: £100-250 (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 3 green flashes — no call-out fees, no surprises.
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Parts commonly replaced
- Flame sensing electrode
- Ignition lead
- Gas valve
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