How to Fix a Furnace That Won’t Stay Lit?

• A furnace with insufficient airflow

Airflow is necessary for the burners to ignite. The blower fan draws air into the furnace through the return air ducts. The burners may not last as long if a clogged furnace filter or a faulty blower blocks the airflow.

It is best to consult a professional for emergency heating repair in Red Deer, Lacombe, Sylvan Lake, AB, and surrounding areas to fix a faulty blower and replace the filter.

• Faulty flame sensor

Burners that won’t stay on are often caused by a faulty flame sensor. Gas furnaces have flame sensors that test whether the gas coming from the burners has ignited. In the absence of flames, the sensor will shut off the gas flow to prevent unburned gas from flooding the combustion chamber. It may be necessary to replace the flame sensor completely if it is too dirty or damaged. 

• Dirt and grime on the burners

The burner’s flame may extinguish if the burner cannot draw enough oxygen for combustion due to dirt or grime buildup on its surface. This is a common issue when a furnace lacks regular maintenance.

Hire furnace repair technicians in Red Deer, Lacombe, Sylvan Lake, AB, and surrounding areas to inspect the burners during maintenance to determine if they need to be cleaned. Cleaning the burners yourself requires disassembling the burner assembly first, so it is better not to attempt this. 

• The heat exchanger is overheating

Another safety feature may be causing the burners to go out. The limit switch, which activates when the heat exchanger becomes too hot, shuts off the gas and the power to the furnace. 

Additionally, the issue could be caused by a furnace failing to properly vent combustion gas from the heat exchanger. You should call our professionals to resolve this issue as soon as possible. 

• Faulty control board

The control board regulates when other components are turned on and off in a furnace. Burners are shut off after a short period if the control board is faulty. You will need emergency heating repair services in Red Deer, Lacombe, Sylvan Lake, AB, and surrounding areas to resolve the issue. 

• Broken thermocouple

When the thermocouple senses that the flame isn’t hot enough, it shuts off the gas flow to prevent the buildup of hazardous gas. However, if the thermocouple is faulty, it may turn off the gas flow mistakenly, resulting in a loss of heat in your furnace.