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Old 04-09-2008, 04:04 PM  
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Default Amana furnace, no heat, red light blinks 3 times, fan works.

Amana Gas Furnace. Furnace blower appears to work, but no heat. 3 Blinking red lights. I googled this, someone said 3 lights can mean:

1. The exterior vent pipe is blocked.
2. The pressure switch is bad or wired wrong
3. The ventor is clogged or jammed.

Attempted some cleaning with shop vac to see if there was an obstruction. When shop vac was stuck into exhaust vent pipe, the furnace kicks on. As soon as I take it out, it shuts off. Not sure what the problem is, but I would like it resolved today if I can possibly do it.

If not, I'll call a pro, but since I'll be calling out of the phone book, I want to minimize the chance of being ripped off by at least seeming knowledgeable.


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Old 04-09-2008, 04:12 PM  
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Sounds like the venter motor is not achieving enough volume to satisfy the required water columns for the pressure switch.

Pressure switch safety proofs come in all shapes and forms.
Sail switch, pressure switch, centrifugal dry contact switch, etc....).

Check the venter motor (not the blower motor) for proper operation. If you have proper voltage to the motor but, it does not ramp up, you could have a bad/stuck motor and/or a bad motor capacitor (if applicable).
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