226 High
Your boiler has entered a temporary lock-out mode because a service engineer's diagnostic tool was recently plugged in and has not been properly disconnected or reset.
Technical description: Diagnosis tool was connected and is now locked out
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the reset button on the boiler control panel.Press and hold the reset button for 5 seconds.Wait for the boiler to complete its startup sequence; if the code persists, a technician may need to re-insert and properly exit their diagnostic software.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 226 — no call-out fees, no surprises.
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Parts commonly replaced
- No parts usually required
- Control display PCB (rare cases)
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