Furnace starts out great & then later not?
Two trips in a row now are furnace starts out great! Lots of heat & by morning when we wake it blowing cold. Can anyone help me fix this? Suppose to another cold night.
Forum Discussion
A battery that reads only 12 volts is technically dead. 12.6-12.7 is fully charged. Older batteries reading low will not have the oomph to continually maintain the needed blower RPM to keep the sail switch closed allowing the furnace to blow cold air and freeze you out. A battery reading 10-11 volts will run the blower motor and it will sound as if it is running ok, But you need that RPM that only a fully charged battery can provide.
