Vitotronic 300 Low
Your boiler is still providing heat but is working less efficiently because it cannot accurately monitor the temperature of the water returning from your radiators.
Technical description: Operation without accounting for return water temperature
Typical repair cost: £140-£260 (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 Vitotronic 300 — no call-out fees, no surprises.
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Parts commonly replaced
- Return water temperature sensor (NTC)
- Sensor wiring harness
- Control PCB
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