BoilerFaultCodesWhat the manual says
Manufacturer manualNo HW But CH Ok
What causes this fault?
This fault occurs when the boiler's internal components or external controls fail to signal that the hot water needs heating, even though the central heating for your radiators is working fine. The most common reason is a faulty motor or sensor that prevents the heat from being diverted away from the radiators and toward your hot water cylinder.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like 4.15: no call-out fees, no surprise bills.
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Related fault codes
All 84 fault codes on the Logic Max Heat 2
Seeing a different code? Every code this model can display, in one place.
Related guides you might find useful
No hot water but heating works
Almost always a stuck diverter valve on a combi.
Read →Hot water works but heating does not
On a combi it is usually the diverter valve. On a system boiler, the motorised valve.
Read →Radiator not heating up
One cold radiator is usually a stuck valve pin or trapped air.
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