Why does my furnace have a flame sensor?

This part does exactly what it says – senses flame to ensure the furnace has fired. If a gas valve is open but the furnace hasn’t fired, it isn’t just emitting raw natural gas or propane. It will leak out of the furnace and into your home where it can easily explode when a water heater fires up or a gas stove lights.

How to tell if you have a bad flame sensor?

How to know if you have a bad flame sensor is quite easy to diagnose. Signs of a bad furnace flame sensor are: The furnace lights but then shuts down after a few seconds (short cycles) The porcelain on the flame sensor is cracked. The flame sensor is sooty or corroded.

What happens when a furnace flame goes out?

Rarely the furnace makes it through the cycle and shuts down normally once the tstat is satisfied. But usually it misfires at least once, often several times. When this happens, the flames suddenly cut out. A few seconds later, the ignitor glows in an attempt to relight. Sometimes the burners light back up on the first try.

How much does it cost to replace a furnace flame sensor?

If you replace it yourself, the sensor will cost $6 to $75 based on the furnace model and whether you buy an OEM part or a universal sensor. Most furnace flame sensors cost less than $40.

Why does my Atwood flame furnace not light?

Needless to say, no gas would reach the burner if the valve fails to open. Take a look at the valve and assess its quality. In most of the case, you should be able to replace the gas valve at moment notice without much difficulty. 4. Flawed Igniter After you activate the furnace, the igniter would generate sparks and ignite the propane gas.

Why does my hydro flame furnace not light?

While the blower motor and fans produce an air stream, the control circuit board would open the gas valve and make the igniter generate sparks. After that, the burner ignites and heat would steadily accumulate in the furnace combustion chamber.

Why do my lights flicker when my HVAC turns on?

It seems like something out of a horror movie, but it’s actually a common occurrence for homeowners. If the lights dim for less than a second or lose only a fraction of their brightness, there shouldn’t be anything to worry about.