304 Medium
Your boiler has been manually reset too many times in a short period and has locked itself as a safety precaution.
Technical description: Too many resets have occured
Typical repair cost: £0-120 (including labour)
DIY fix possible
Turn off the power supply to the boiler at the main switch or fused spur.Wait at least 30 seconds for the internal memory to clear.Turn the power back on to clear the lockout and attempt to restart the system.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 304 — no call-out fees, no surprises.
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Parts commonly replaced
- None (Software reset usually sufficient)
- Ignition Electrode
- Gas Valve
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