So Summer is over and your ready to turn on your gas furnace for the first time, but you have one small issues, your furnace does not come on. Well, we are going to help you a bit before you rush to call a heating service tech. Reasons for the furnace not working can be complex or very simple. While you are probably better off leaving the difficult problems of thermocouples, wiring and motors to a heating specialist, there are a good number of things you can check before you phone a qualified HVAC contractor for service. Below we've shared a few tips tips to help you diagnose a gas furnace. Check your Air Filters: Dirty filters will restrict the air flow back to your furnace and in result, the furnace will shut down on high limit code as the chamber is getting too hot. An easy check before you call a furnace repair tech. Check the pilot light. (Electronic ignitions will not have a pilot light). If your furnace clicks on or initiates the start cycle, but does not fire up, you likely have a faulty or dirty ignitor/sensor. This is one of the most common furnace problems. If You Feel Comfortable: Check the error codes in your furnace user manual to make sure you do not have a more serious problem. To fix the furnace that won't start, turn off the power to the furnace-and turn off the gas. Remove the front panel and look for the ignitor/sensor. Refer to your user manual to locate the ignitor. It is usually located near where the flames shoot out of the burners. Basically, the furnace will not continue in the starting sequence because the sensor/ignitor is dirty and needs to be cleaned. It is very easy to remove the sensor with a screw driver. Clean the probe on the sensor by rubbing it with some medium grain sand paper. Do a thorough job, but be careful not to break the thing. Replace the sensor exactly the way you found it. Put the front panel back on, turn on the gas, and then turn on the power. Turn up the temperature on your thermostat to see if you gas furnace will fire up. Check Thermostat Batteries & setup: First check to see if your thermostat has batteries, if it does make sure they are good. If the thermostat works for cooling and not ... The post Tips to Help You Diagnose a Gas Furnace | ComfortGuy.com appeared first on R & S Mechanical | HVAC, Refrigeration & Plumbing Raleigh | ComfortGuy.com.
