Are you sure you mean the HR92 valve position (by going to option 10 in the HR92 itself) or do you mean the heat demand for the zone reported in the...
Charging the batteries probably generates additional heat but if the unit is left on the charger the batteries are rarely charging as they sit fully...
Minimum hot water temperature is set indirectly by changing the differential. Minimum = setpoint - differential, so increase the differential number....
5kW minimum output without cycling is still a lot for spring/autumn. Even if anti-cycling doesn't kick in in the middle of the winter I'd expect that...
If all zones are suddenly reporting errors then normal deduction would say that either there is massive signal interference from something (unlikely...
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