Check that the thermostat is in heat mode and set point is above room temperature

1 inch filters should be changed frequently' media filters are to be changed according to manufactures specs

Filters are usually located inside the unit or in a ceiling grill

The emergency switch is usually located at the top of basement stairs or on wall of mechanical room

Check that all circuit breakers are in the on position

Circuit breaker panels are usualy located in the basement or garage, though sometimes can be in other locations

Turn off switch located on the furnace, wait 30 seconds, then turn back on

If your heat does not begin to work after a few minutes, Call for service

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If you need to reset switch often, Call for service