E 43 High
Your boiler has lost its connection to your room thermostat, meaning it cannot receive instructions on when to turn the heating on.
Technical description: Room thermostat communication error – disconnection or communication loss in room thermostat.
Typical repair cost: £60-250 (including labour)
DIY fix possible
Check if your wireless thermostat needs new batteries.Ensure the thermostat is within range of the boiler and there are no new obstructions.Check that the thermostat's receiver unit is powered on and plugged in correctly.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E 43 — no call-out fees, no surprises.
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Parts commonly replaced
- Thermostat batteries
- Room thermostat transmitter
- Wireless receiver
- Communication wiring
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