133 High
Your boiler has tried to ignite but failed to stay alight, which is often caused by a lack of gas supply or a blocked condensation pipe.
Technical description: Safety time to establish flame exceeded
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check that your gas supply is turned on and you have credit on your meter.During freezing weather, check if your external white plastic condensate pipe is frozen and thaw it with warm water.Press the Reset button for five seconds.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 133 — no call-out fees, no surprises.
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Parts commonly replaced
- Gas Valve
- Ignition Electrode
- Printed Circuit Board (PCB)
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