Honeywell ST9420c -do I have a re binding issue?

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24 Oct 2020
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Since turning heating on again, I've had problems with the heating not coming on, or going off before the set temp is reached.
Honeywell answered my enquiry and suggested I might need to rebind the st9420c and DT92E.

After many tries I finally completed this process for the heating.

I've discovered that the heating is now working perfectly provided I have the hot water control set to off. If I turn it back on, the boiler green light goes off, though the panel light stays on.

I'm wondering if the hot water mode needs rebinding, but I can't see that the thermostat is relevant to the hot water control. Can anyone advise me?

The system was new, with a Worcester Bosch boiler 4 years ago. I have it serviced by them, but the service engineer isnt familiar with wireless systems.
 
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I can’t see that knocking the hot water off. Could be a wiring issue.
 

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