Combi randomly fires up at night
System installed and all seems to work ok. Wireless thermostat, bridge, 7 TRV's. No connection issues, good signal.
The combi comes on 2-3 times a night for a short period (a few minutes). It wasn't demanded to do so by any of the connected items. It doesn't heat any of the rads. We don't have the heating on at night and everything was set at frost protection - I've changed everything to 10 degrees to see if the system was trying to protect the boiler but this made no difference. It annoying like most problems b because the boiler is below us in the house.
Any pointers would be greatly appreciated.