D.47 Low
Your boiler is struggling to accurately measure the temperature outside, which may cause your heating to be less efficient or run at the wrong temperature.
Technical description: Outside temperature with weather compensator – Vaillant controller only
Typical repair cost: £90-180 (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
- External temperature sensor
- Wiring/cabling to outdoor sensor
- VRC 700/720 control module
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