D.70 Low
Your boiler is currently stuck between modes and is trying to decide whether to send heat to your radiators or your hot water tank.
Technical description: Set diverter valve position
Typical repair cost: £0-80 (including labour)
DIY fix possible
Locate the grey selector knobs on the front of the boiler control panelTurn the radiator temperature dial slightly up or down to trigger a new demandWait 60 seconds to see if the display changes to a standard temperature reading
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.70 — no call-out fees, no surprises.
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Parts commonly replaced
- No parts required (Software setting)
- Diverter valve actuator (if stuck)
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