Vitotronic 300 High
Your boiler is struggling to accurately measure the temperature outside or inside the unit, causing it to shut down for safety once it gets cold.
Technical description: Activates after 0°C / 32°F outdoor temperature
Typical repair cost: £120-280 (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
- Outdoor temperature sensor
- NTC thermistor
- Wiring harness
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