D.19 Low
Your boiler is currently running a check on its internal pump speeds to ensure it is circulating water as efficiently as possible.
Technical description: Operating modes of the two speed heating pump
DIY fix possible
No action is required as this is a status message rather than a faultMonitor the display to ensure it progresses to a standard temperature readingIf the code persists for a long period, restart the boiler using the power button
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.19 — no call-out fees, no surprises.
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