F6 Low
Your boiler has lost connection with the sensor that monitors the outdoor temperature, which might make your heating less efficient.
Technical description: Outside sensor failure
Typical repair cost: £90-160 (including labour)
DIY fix possible
Locate the reset button on the boiler control panelPress and hold the reset button for two secondsCheck if the weather compensation sensor outside looks damaged or blocked by debris
Protect yourself from future repair bills
A boiler cover plan would cover faults like F6 — no call-out fees, no surprises.
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Parts commonly replaced
- Outdoor weather compensation sensor
- Wiring loom
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