D.58 Low
Your boiler has paused its own water heating because it detects that your solar panels have already provided enough heat for your hot water cylinder.
Technical description: Activation of solar reheating
Typical repair cost: £0 (including labour)
DIY fix possible
No action is required as this is an advisory status message rather than a functional fault.Check your solar thermal controller to confirm it is operating as expected.Wait for the solar heat input to decrease, at which point the boiler will resume normal operation if needed.
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.58 — no call-out fees, no surprises.
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