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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Replaced the ignitor and the heater still does not come on.

Customer Question

Replaced the ignitor and the heater still does not come on. I can still hear the inductor motor spinning throughout the house and my unit is in the crawl space under the house. It spins until it automatically turns off. The ignitor does not turn red. I do not smell gas either. What could this be?
Submitted: 28 days ago.
Category: HVAC
Expert:  BillyHvac replied 26 days ago.

My name is***** see your question stumped the panel here.

I just logged on and saw you had not received an answer yet.

I am willing to help you if you still need assistance. Just let me know how the project is going and I can help you or close this question for you.

Once again I apologize for the delay.

Billy

Customer: replied 26 days ago.
Hello Billy. I think I may have narrowed this down to the draft inductor but not sure. I don't have a multimeter.
Expert:  BillyHvac replied 26 days ago.

can you tell if the exhaust fan motor is running?

What happens is the exhaust is supposed to start first

Then the air it creates closes a small air switch...this switch must close before anything else happens.

The first item to check is if the exhaust fan is running or not...and if not is it warm/hot?

Customer: replied 26 days ago.
the exhaust fan does run.
Expert:  BillyHvac replied 26 days ago.

thank you...is the furnace exhaust vented in a metal pipe to a chimney or out the side of the house in pvc pipe?

Customer: replied 26 days ago.
It's going out metal piping out the side of the house
Expert:  BillyHvac replied 26 days ago.

Are you familiar with the pressure switch?...and if not supply a model number so I can supply pic

Customer: replied 26 days ago.
I'm familiar with it
Expert:  BillyHvac replied 26 days ago.

pull the rubber tube and check for cracks..trim if necessary. Use a paperclip or small nail and poke the tube fitting on furnace clear all the way through. Make sure nothing in chimney pipe....

Customer: replied 26 days ago.
Ok. Give me Few minutes
Customer: replied 26 days ago.
Ok. So I did all of that. When I turn power on, only the exhaust fan comes on
Expert:  BillyHvac replied 26 days ago.

ok,

does your pressure switch have 2 wires attached?

Customer: replied 26 days ago.
Yep.
Expert:  BillyHvac replied 26 days ago.

do this exactly..

power off

remove the 2 wires from pressure switch and hold apart

power on

AFTER the exhaust fan starts running..touch and hold the 2 wires together metal to metal.

Tell me if it tries to ignite

Customer: replied 26 days ago.
Customer: replied 26 days ago.
Ok
Customer: replied 26 days ago.
No it doesnt
Expert:  BillyHvac replied 26 days ago.

then you have an open safety or board issue. What is the model number

Customer: replied 26 days ago.
UGPH-10EAMER
Expert:  BillyHvac replied 26 days ago.

and is there a code blinking on the circuit board?

see page 32 HERE

Customer: replied 26 days ago.
The lights are steady on
Expert:  BillyHvac replied 26 days ago.

then either the board is bad

the exhaust is not running

or it is operating.

The steady lights mean normal and the yellow light solid means flame present

Customer: replied 26 days ago.
Ok. Even though the exhaust fan turns could the exhaust motor still be bad
Customer: replied 26 days ago.
It's is very loud when it turns
Customer: replied 26 days ago.
Last year it worked but ran louder than ever

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