First, check and make sure that your gas is turned on.

Rheem gas furnace not igniting. The sensor is responsible for turning off the gas burners to avoid gas. When the furnace ignitor is not giving off a glow, it could mean the glow plug has been damaged. The igniter gets very hot and glows bright orange to light the gas burner.

I tested the gas valve wires during. Dirty filters cause insufficient airflow and can prevent the furnace from starting. Furnace not igniting or heating?

Also, check that the power to the furnace is on. As mentioned above, sometimes the cause of a furnace ignitor failing to ignite is due to a safety issue, such as a clogged air filter, for instance. If the igniter fails or cracks, the furnace won’t heat.

To determine if the igniter is faulty, remove the igniter. You have to blow across the. The glow plug is an essential part of the ignitor.

One of the most common reasons a furnace is not igniting is when the line in which the furnace draws its fuel is either blocked or too small for your needs. If you're getting 24v and the valve isn't opening then the valve is bad. Turn power off, r emove the 2 wires from pressure switch, hold apart, turn furnace on.

After the exhaust fan starts, touch the 2 wires together and. Take a look at the air filter. Ensure the furnace filter is clean—if not, replace the dirty filter with a clean filter.