411 Medium
Your boiler has lost communication with the main thermostat or temperature sensor that controls your primary heating zone.
Technical description: Room sensor circuit open or short circuit zone 1
Typical repair cost: £90-180 (including labour)
DIY fix possible
Check if your room thermostat or Clima Manager has run out of batteriesEnsure all wired connections to the thermostat are secure and haven't been knockedRestart the boiler using the Reset button to see if the communication error clears
Protect yourself from future repair bills
A boiler cover plan would cover faults like 411 — no call-out fees, no surprises.
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Parts commonly replaced
- Room thermostat
- Wiring harness
- Internal PCB
*Affiliate links — we may earn a commission at no extra cost to you.