#FURNACE WON T IGNITE CODE#

ItвЂ™s a box-shaped device and is typically located near the gas burners. Make sure the thermostat is in heat mode.If you have an older model furnace with a standing pilot light, you can follow this basic procedure to relight the pilot flame. Once it has cooled, the pilot tube can easily be cleaned. If the pilot tube is dirty, let the furnace cool down and turn off the gas. It can easily be cleaned off with fine grain sandpaper.ДЄ dirty pilot tube can also prevent the pilot from staying lit. It may be that itвЂ™s dirty and needs cleaning. Be sure to inspect the thermocouple carefully. You can try bending the thermocouple back into position. Sometimes, this causes the pilot light to stay on for only a few seconds. It could simply be that the thermocouple is bent. A faulty thermocouple may arbitrarily determine that the light is off when you want it on and vice versa. The thermocouple detects the pilot light via sensors. Some common causes include issues with the thermocouple and pilot tube. If your furnaceвЂ™s pilot light wonвЂ™t stay on, the furnace wonвЂ™t work. With cooler temperatures just around the corner in Newnan, GA, youвЂ™ll want to be sure your furnace will be ready to keep you warm.

#FURNACE WON T IGNITE CODE#

On most newer gas furnaces with an integrated control board, a pressure switch fault will generate a diagnostic code - usually a code 2 or 3, but it varies with the board manufacturer.Originally published January 2014, last updated September 2019 It is not unusual for a partially restricted venting system or a clogged drain to allow a furnace to fire and then shut-off some time during a heating cycle. Most newer gas furnaces use one or more pressure switches to monitor for proper venting and condensate drainage. Pressure Switch Trip - Qualified Technician Recommended On most newer gas furnaces with an integrated control board, a limit switch fault will generate a diagnostic code - usually a code 4, but it varies with the board manufacturer. Possible causes are a bad blower motor, a clogged air filter, blocked or restricted registers, or under-sized ductwork.ДЄ high-limit switch trip caused by no airflow (bad blower) will typically occur within 30-60 seconds after ignition.ДЄ high-limit switch trip caused by low airflow may only occur after long run cycles. High limit trips are generally caused by a lack of airflow across the heat chamber. When the heat chamber cools, the limit switch will re-activate and allow the burners to re-fire. When the high-limit switch trips it will turn-off the burners. Gas furnaces are protected against over-temperature by a high-limit switch. High Limit Trip - Qualified Technician Recommended Look for signs of moisture or water from a clogged condensate drain or leaking vent pipe. If the flame sensor is clean but the burners still shut off around 6 seconds after ignition, this may be the result of a faulty ignition control.ДЄ common cause of a faulty ignition control which fails to sense flame is water damage. Faulty Ignition Control - Qualified Technician Recommended Multiple failed ignition attempts will typically generate an 'Ignition Failure' diagnostic on the ignition control board.ДЄ dirty flame sensor will generally cause occasional ignition failures, but may allow the furnace to fire and function properly the majority of the time. If the burners visibly ignite, but then go out after approximately 6 seconds, this may indicate a dirty flame sensor. If the flame sensor does not detect a flame within 6 seconds after opening the gas valve, the ignition cycle is terminated. POSSIBLE PROBLEM & DESCRIPTION Dirty Flame Sensor - Qualified Technician RecommendedДЄfter a gas furnace opens the gas valve to allow gas into the combustion chamber, the furnace control board will monitor for proper ignition of the gas.

Furnace won t ignite