Model #N8MPN075F16A1 ICP Furnace/Heater, Gas

  • Furnace
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Question and Answers

Q:

International Comfort Product furnace not working

A:

Managemylife.com is always a great resource to find the answers to just about anything. Your expert will research your question and respond within two business days but usually sooner. Have a great day!

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Alina -
December 15, 2012
A:

So i looked at the list of codes on the furnace cover and saw that 3 blinks indicates a stuck open pressure switch. I can not locate one locally. Would a faulty pressure switch case this issue?

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Raja -
December 15, 2012
A:

That is correct, the control board senses that the pressure switch is stuck open and will not progress through the heating cycle. The furnace has to first see that the switch is open. The inducer motor will then start and the negative pressure created by the inducer motor is supposed to pull the pressure switch closed. The control board sees that the pressure switch is not closing and is shutting down on safety.

The pressure switch may not have closed because of any of the following.

-There is a blockage in the venting
-The draft inducer motor is not running or not running at full speed.
-The pressure switch tubing (small diameter rubber tubing), is dirty, torn or cracked.

Start by turning the furnace off at the thermostat as well as power to the furnace. Then remove the doors to the furnace and locate the draft motor. It will be the motor that connects to the exhaust. Follow the small rubber tubing till you come to the pressure switch which will be a small round disc about 3-4" in diameter. Remove the tubing but remember where it goes. See if you can see any tears or cracks as well as any dirt. If you can't see through it, then it may have a blockage.

Check your exhaust whether it exits through the roof or the side of the house. You should be able to see if there is anything obstructing it such as snow or ice. If you still can not get it running I would suggest calling for service rather than ordering a pressure switch.

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Andrew D -
Sears Technician
December 17, 2012
A:

I checked the motor and it was hard to spin manually. I gave it a few spins and heard something small fall out and then it began to spin freely. Powered the unit back up and worked fine after that. Must of been something stuck in the motor? Thanks for your answer!

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Raja -
December 19, 2012
A:

You're welcome. If you have any further problems, you will want someone to come out and remove the inducer to inspect it for a broken wheel.

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Andrew D -
Sears Technician
December 19, 2012
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