I had new boiler fitted. Unfortunately it come with ST9100A as a programmer but it have only 2 daily programs and Honeywell Wireless Room Thermostat Y6630D1007. So you can only set one temperature for all day. As thermostat is wireless i replace Y6630D1007 for cm927. Simply turn ST9100A for continuous on and connect CM927 to existing HC60NG.
Room temperature is 20C and when i rise to 20,5C thermostat CM927 fire up boiler so it look all connected well. Boiler is start working but only on lowest possible burner modulation rate. So after while flow temperature raise to max 40C even if system is set to max as operating manual says (5.2.2).
Sometimes when i change target temperature to 25C boiler start working "normally".
Sorry for my bad English. Hope you understand what i mean.
Room temperature is 20C and when i rise to 20,5C thermostat CM927 fire up boiler so it look all connected well. Boiler is start working but only on lowest possible burner modulation rate. So after while flow temperature raise to max 40C even if system is set to max as operating manual says (5.2.2).
Sometimes when i change target temperature to 25C boiler start working "normally".
Sorry for my bad English. Hope you understand what i mean.