SUP High
Your boiler's temperature sensor has stopped sending the correct signals, meaning the system doesn't know how hot the water is and has shut down as a precaution.
Technical description: Supply sensor short / Supply sensor open
Typical repair cost: £90-160 (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 SUP — no call-out fees, no surprises.
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Parts commonly replaced
- Flow temperature sensor
- Wiring harness
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