Originally Posted by NorthernHeat
Blower turns on but there is no heat.
Thermostats only control a fan relay
, fan center
or circuit board
to turn on the blower motor.
Although these relay's are necessary for cooling to work, they have nothing to do with the heating operation or outdoor cooling section of the equipment.
Electric furnaces may
or may not
use this relay controlled by the fan switch of the thermostat.
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