Question about Heating & Cooling
Lights then shuts off sounds like relay in the board clicks when it shuts off
The clicking noise is the heat fan relay. The limit control switch or the high temp thermal disc is what usually causes this. I am with the other guy as I need a little more info. The limit switch has a flat panel with 2 wires on it and held on by 2 screws. It goes inside the heat chamber and has a long probe on the back, usually 3 to 4 inches long. The thermal disc is just that, a disc about the size of a nickel, with 2 wires attached, and is usually not far from the limit control. If you can find these parts, by-pass them by removing the 2 wires on them and connecting them to each other. If this solves the problem, that's it. A faulty thermostat may do the same thing. Go to the thermostat and connect the red to the white wire, problem stops, change the thermostat.
Posted on Jan 12, 2008
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Posted on Jan 02, 2017
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1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor.If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.
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