My Furnace Won’t Start. Any Tips Before I Call for Service?

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When your furnace won’t start, you might feel a sense of panic and wonder if there is anything that you can do before calling for professional assistance. Before you make a call for furnace repair, here are several things that you can do to troubleshoot the heating system.

1.  Check the thermostat.
Make sure the thermostat is set to the heating function and that the temperature set point is higher than the ambient temperature. If necessary, turn the fan to the “on” mode.

2.  Check the power.
Even gas systems use electricity. Check to make sure the circuit breaker to the heating equipment has not tripped. Inspect the system’s power cord for signs of damage. Make sure the power switch is in the “on” position. Look at the control board of the heating system and see if there are any burn marks that indicate an electrical short.

3.  Check the blower.
The blower compartment has an inspection window with a light that should be flashing green. If it is red or not flashing, there could be a problem with the blower motor, transformer, control board or run capacitor.

4.  Check the condensate pan.
If the reservoir in the condensate pan is full, the heating system will not turn on. Drain the reservoir and check the condensate pipe for blockages. The pump may have lost power or it may need to be replaced.

5.  Check the pilot light.
If the pilot light has gone out, relight it. Once the flame is lit, check to make sure it reaches the bottom of the thermocouple switch. If the pilot light goes out right after you light it, the assembly or sensor could be dirty.

6.  Check the gas.
A disruption of the gas supply to your home could leave your heating system without fuel. If you smell gas, leave your home immediately and then contact us for urgent repair service.

After taking these troubleshooting steps, contact us if your heating system still does not start or if you are unsure of how to do any of these troubleshooting steps. Our experienced HVAC repair team has the safety equipment and tools to inspect your entire heating system for signs of problems. Our experts are certified for working with gas lines and have the personal protective gear to do so without injury. We are experienced in working on all types of gas and electric heating systems. No heating problem is too complex for our professional staff.

Information from Air Master