D.47 Low
Your boiler's outside temperature sensor is either giving an incorrect reading or has lost communication with the main control system.
Technical description: Outside temperature with weather compensator – Vaillant controller only
Typical repair cost: £100-220 (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 D.47 — no call-out fees, no surprises.
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Parts commonly replaced
- VRC 700/720 outdoor sensor
- Sensor wiring
- VR 70/71 wiring centre
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