Step 5: Clear Your Furnace Vents For Blockage:
On High-efficiency furnaces check to see there is no restriction in front of exhaust and intake vent pipes. Sometimes snow piles up and blocks the exhaust or intake vent pipes, which causes the pressure switch to open. Pressure switch which senses negative pressure in the venting turns off the furnace. The furnace pressure switch ensures there is no blockage in vent pipes.
Step 6: Igniter Problem:
Pilot light out is the most common problem among older furnaces. These furnaces don’t have an Inducer motor. On a call for heat, the gas valve opens and passes the gas to the burners where a small pilot flame that stays ON all the time lights the main burners.
Some high-efficiency furnaces have spark igniter to light the burners. On the call for heat once the inducer motor ensures safe operation then the circuit board sends a signal to spark igniter. It stops sparking after lightening the burners….
Most high-efficiency furnaces have HSI. On the call for heat once the inducer motor ensures safe operation then the circuit board sends a signal to HSI. It glows and lights the burners and stops glowing after lighting the main burners.
(Note) Depending on which furnace you have, if you can see the pilot light, HSI glow, or hear a spark but the burners don’t come on then it’s a furnace Gas Valve, Circuit Board, or Gas related issue.
Step 3: Furnace Error Codes:
Remove the front cover of the furnace. You will see the top and bottom compartments of the furnace. On the bottom compartment, you will find a see-through round glass. This see-through glass is to check the furnace fault codes. You can check how many times the LED either red or green or combinations of both lights are flashing. Note the flashing sequence and match it with the LED error codes given on the back of the furnace cover or on the user manual. It depends on what brand of furnace you have will have its own troubleshooting flow chart. You can also find your Furnace error codes at the bottom of this page.
What are the codes on a Goodman furnace?
What does it mean when the red light is flashing on a Goodman furnace main board?
How do you reset the code on a Goodman furnace?
What does 7 flashes mean on a Goodman furnace?