There are various instances that may cause the thermocouple to not detect the flame in your gas furnace.
Furnace pilot light keeps going out.
This is the pilot flame that provides the heat.
If you can manage to get the pilot light lit for just a moment inspect the flame.
This component will deactivates the gas when the pilot light goes out.
If your pilot light won t stay lit the thermocouple is very likely the culprit.
An unlit pilot light means that the burners can t come on and the furnace won t work.
A bad thermocouple pilot light problems bad gas regulator bad gas valve.
In this hvac training video i show up close how the thermocouple pilot light and gas valve work on a water heater furnace fireplace as well as other ap.
5 reasons why your pilot light keeps going out 1 faulty thermocouple.
Either the thermocouple is going bad or it is dirty and needs to be cleaned.
Dirt buildup around the pilot light.
2 pilot orifice is dirty.
3 bad gas.
But a common problem that people with furnaces run into is a pilot light that keeps going out.
The number one reason why the pilot light keeps going out is the thermocouple.
If your furnace has a standing pilot light you may experience some frustration with it blowing out on windy days.
We have compiled a few tips you can try to fix the problem.
Dirt buildup is problematic for many parts of your furnace including the area around your pilot light.
Well if your gas furnace pilot light won t stay lit it s usually due to 1 of these 4 issues.
If this pilot light ever goes out the heater has no way of actually turning on to heat the water or air that your particular type of heater circulates to warm the house or other elements.
For example dirt can build up in the intake valve and restrict the amount of oxygen that is required to keep the pilot light burning efficiently.
The best cure is electronic ignition.
If your furnace pilot light keeps going out it s likely you have a broken thermocouple in your gas furnace.
However electronic ignition is not feasible nor cost effective for most standing pilot furnaces.