205 High
Your boiler has lost its connection with the internal sensor that monitors the temperature of the water returning to the unit.
Technical description: E-combi oneE-System oneClas Net one CombiClas one Combi
Typical repair cost: £120-£250 (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 205 — no call-out fees, no surprises.
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Parts commonly replaced
- Return temperature sensor (NTC)
- Wiring harness
- Main PCB
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