Question about York Furnace Draft Inducer Blower Fasco # A224
I would suspect the air pressure differential switch. It looks like a diaphragm with a piece of tubing running to it and a electric switch mounted on it. Before changing it though, check that the condensate drain trap has water in it. I know that sounds silly, but if there is no water in the trap (if it's desperate from AC trap, then it can dry out in summer) you can be pulling air through the trap, and not enough pressure differential to trip switch. Also be sure the intake is clean outside. If there is any kind of Screen on intake be sure it's open. You can test switch with tester to see if it is the problem. The switch should close after the draft inducer fan starts.
Posted on Oct 08, 2010
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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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