D.22 Low
This is a normal status message indicating that your boiler is currently working to heat up your hot water cylinder.
Technical description: Hot water demand
Typical repair cost: £0 (including labour)
DIY fix possible
No action is required as this is a status code, not a fault.Wait for the boiler to finish heating the water and it will return to a different status code.If you have no hot water, check that your external cylinder thermostat or programmer is set correctly.
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.22 — no call-out fees, no surprises.
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