Why does my furnace work at night?

[szczukot]

Sometimes I hear my furnace "doing something" at night. And I don't know what.
The house heating is turned off. Only water heating is turned on, but during daylight hours.
I managed to find the registers that change.
Can someone help me explain what they are for and why something is happening?

bai:extwp:0	External heating pump
bai:gasvalveasicfeedback:0	feedback gasvalve (from ASIC)
bai:templimiter:0	feedback signal of the temperature limiter
bai:wp:0	internal heating pump
f43:hc1pump:0	first heating circuit pump's state
mc:boilercircuitpump:0	first heating circuit (burner circuit) pump's state
mc:hc1pumpkol1pp1port:0	first heating circuit pump's state
mc:hc2pdemand:0	
mc:hc2pumpalport:0	second heating circuit (mixer circuit) pump's state
mc:hc2zport:0	port: close mixer