Vitocrossal 300 Medium
Your boiler is struggling to accurately measure the water temperature leaving the system, meaning it may not run efficiently or heat your home correctly.
Technical description: Regulates without supply temperature sensor (low-loss header)
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 Vitocrossal 300 — no call-out fees, no surprises.
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Parts commonly replaced
- Low-loss header temperature sensor
- NTC thermistor
- Wiring harness
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