Thermostat not set properly
Emergency or shut-off switch turned off (usually a red button around the burner area near the gas valve if it keeps tripping you need a service tech.)
Blown fuse in the panel box (replace both fuses)
Circuit breaker tripped or off- (sometimes a breaker will trip but it won't move, always turn off and back on to reset even if looks on)
Disconnect turned off next to unit look like a light switch - (this is one of the biggest things we see usually someone turn off by accident.)
Condensate pump or safety switch opened at blower or furnace unit (check pump, usually located near indoor unit)
Unit "locked-out"- (reset by turning off then turning back on, sometime you have to turn off power and back on. If problem persist then you need to call us.)
If your unit is over 10 years old check and see if has a pilot to light if it does the gas valve will have a pilot button on it. If Pilot is out try relighting.
Be sure gas is on at the meter, gas line at furnace and gas valve.
On 90% furnace that vent from the house with PVC check to make sure that nothing is obstructing the opening of the pipe
Faulty time-delay relay
Faulty thermostat wire (sometimes damaged by animal or lawn mower)
Safety device tripped - (low pressure, low temp, high pressure, high temp...)
Faulty control module
To many to list on a gas furnace
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