York Affinity Furnace tries to start but can't

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  #1  
Old 11-01-15, 10:07 AM
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York Affinity Furnace tries to start but can't

I have a York Affinity furnace that tries to start but is unsuccessful. You hear a relay click, then the draft motor starts and runs for about 2 seconds and then it shuts down. It keeps doing this over and over again.

The solid igniter, when removed was examined for cracks and tested for ohms. The resistance was 75 ohms.

The tubing to the draft motor was removed and checked to be clear and they were. One thing to note was that the draft motor would run for about 30 seconds when the tubing was disconnected and then shut off after that. If you reconnected the tubing before the 30 seconds were up, It would shut off within 1 second.

Where do I go from here?
 
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Old 11-01-15, 10:51 AM
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Any blinking LED codes on that furnace?

The furnace model number is in the burner section.
If you post it we may be able to see a diagram.
 
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Old 11-01-15, 05:43 PM
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Any time the thermostat calls for heat, the inducer motor should turn on and stay on as long as a call for heat is present.

Use an AC voltmeter to see if the thermostat is turning on 24 VAC to the W terminal at the furnace. If it is and the voltage stays on when the inducer motor shuts off, the thermostat is OK.


Then you'd need to check the 120 VAC power supply to the inducer motor. With the thermostat calling for heat, does the 120 VAC to the inducer motor turn on and stay on? It should show 120 VAC as long as the thermostat is calling for heat.

If the voltage shuts off, you have a bad circuit board which is failing to turn on the voltage to the inducer motor properly.

If the inducer motor has power but doesn't run reliably, you have a problem with the inducer motor or assembly.
 
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Old 11-02-15, 04:44 PM
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Thank you for your reply SeattlePioneer & Houston204.

The problem ended up being a clogged P trap. Once it was cleared, the furnace worked fine.
 
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