D.0 Low
Your boiler is not running at its full heating capacity, meaning it may struggle to keep the house warm because it is stuck on a lower heat setting.
Technical description: Heating part load error
Typical repair cost: £0-90 (including labour)
DIY fix possible
Locate the user control panel on the front of the boilerNavigate to the 'd.0' setting in the installer level (refer to manual)Check if the kW output has been set too low for your property size and increase if necessary
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.0 — no call-out fees, no surprises.
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Parts commonly replaced
- None (usually a software setting adjustment)
- PCB (rarely)
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