Hello all I need help with my Furnace I'm getting the number 2 flashing error code on St Croix Revolution furnace. It only happens on real cold nights. The furnace will run great during the day but at night when temperature drops below ten outside the furnace will go into error code number 2. I have set it on Manual mode program # 3 heat level 5 (it's cold out). I read the manual it says a vacuum problem but the stove is clean its burning great and it's only a couple months old. It will run great in Thermostat mode. Anybody run into this problem or having any suggestions.
Thanks In advance.
Thanks In advance.