Top 5 failures we see with gas furnaces

Top 5 furnace failures that will leave you without heat

We decided to look at all the repairs we did in 2018 and find out what are the most common failures we see with gas furnaces.

  1. Capacitor Failure: A faulty capacitor may prevent the blower from functioning at all. Signs of a failing capacitor are a bulging look to them or will be leaking. To know for sure it has failed you will need a multimeter to do a ohms test on it.
  2. Clogged Air filter: Believe it or not this is very common and can cause your furnace to shut down. Having a dirty/clogged air filter causes restrictions in the air flow and can cause your furnace to overheat making the high limit switch trip. The high limit switch is a safety switch to ensure your furnace doesn’t get too hot.
  3. Hot Surface Igniter: The surface igniter is used to light the gas. This part fails quite frequently and is extremely delicate.
  4. Blower Motor / Fan Motor: The furnace may ignite but without any airflow, the furnace will go into a lockout. Blower fan motors typically will seize up after 1000’s of hours of running.
  5. Improper Installation: A majority of our services call repairs consist of HVAC systems improperly installed. Typically the ducts are not sealed properly causing high electricity bills, or the HVAC duct system has been improperly sized to try and save on installation cost. The HVAC system is too restricted causing the furnace to shut off on a high limit meaning the furnace is overheating. Going with the lowest bidder might actually cost you more money in the long run.


Call EMCO Heating & Air today 435-256-8483 to schedule a 20-point furnace Tune-up