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- Thermostat is set on Heat and turned on. Next if electronic, are batteries charged? Is there a display showing? Set temperature three degrees or higher than current room setting.
- Power supply. Your furnace should have an Emergency Power Off Switch. Make sure it’s on. Next check main breaker box. If a breaker is tripped it will be between ON and OFF. Reset the breaker by turning OFF, then back ON.
- If you have fuses, check to see if the fuse for the furnace is blown. If so, replace it with the SAME SIZE fuse. Do not increase the size of the fuse. WARNING: If a breaker is tripping or a fuse blowing more than once, call a qualified technician to inspect your system to diagnose why you are having problems.
- Dirty air filter can cost you more than you think. It also can cause no heat. Clean or replace filter. All air filters have a certain amount of airflow resistance. Add dust building up on the filter and eventually it begins to block airflow and requires more energy to operate. Reduced air flow also stresses other components that can be costly to repair.
- Fuel supply – make sure you have oil or gas supply and that valve is open.
- Blower motor needs to be reset (due to an overload). RESET button should be near the blower motor's housing - press it. If motor does not respond, wait 30 minutes for the motor to cool, then try the RESET button again.
- Pilot light could be out. Newer furnaces will have intermittent pilot, hot surface ignition or direct spark. If your furnace is older you probably have a continuous burning standing pilot that is used to light the main burner. If your standing pilot won't stay lit, try replacing the thermocouple. If that still won't work try another thermocouple then replace the gas valve (sorry not much else can be done)