Why Your Furnace May Not Be Working
There are several reasons why it may not be working. Most modern furnaces have a diagnostic light that aids in determining what area needs further diagnosis. Here are some common reasons for breakdowns:
Dirty flame sensor: the flame sensor is located between the burners and the opening of the heat exchanger. It senses the flames. Over time carbon will build up, reducing the sensitivity of the sensor. It can be cleaned, seldom does it need to be replaced.
Ignitor cracked or broken: This will need to be replaced. As the ignitor gets older and has more wear and tear, the electrical resistance becomes higher making it harder for electricity to pass through. With age it becomes white and chalky looking.
Drain line plugged: this can be removed and flushed, or worst case scenario, may need to be replaced. High efficiency furnaces produce water, over time the drain line can grow algae and plug the line causing water to back up into the furnace.
Dirty air filter: This should be checked monthly and changed as needed. The air filter traps particles and prevents them from getting into your motor and furnace parts.
All of these problems and others can be avoided with an annual clean and check.
