D3 232 High
A safety switch or an external control, such as a thermostat or a condensate pump, has tripped and told the boiler to stop running.
Technical description: The external switching contact has opened
Typical repair cost: £90-220 (including labour)
DIY fix possible
Check if your thermostat or programmer is calling for heat and has working batteries.If you have a condensate pump, check if it is full of water or blocked.Ensure all external switches or emergency stop buttons near the boiler are in the 'On' position.
Protect yourself from future repair bills
A boiler cover plan would cover faults like D3 232 — no call-out fees, no surprises.
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Parts commonly replaced
- Condensate pump
- External thermostat
- Wiring harness link
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