DUCANE not igniting

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Jack1966

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Good evening,

I have a 2006 Ducane HVAC/furnace, electronic ignition.

All summer the system was running just fine in cooling mode. As it got colder, I wanted to start the heating mode.

I set the thermostat to the desired temperature and the unit started as expected.
Meaning: the inducer fan kicked on and ran. But it did NOT ignite.

I got the nefarious 3 flashes of the LED. Looking up the error code I learned, that this is the pressure switch.
So I ordered one and installed it. Even tested it by "unplugging" the rubber hose and sucking on it. Yes, the inducer kicked in.

But still not igniting.

So I read more and compared symptoms with cases I found on the net.

That led to the next 3 steps:

1) cleaning flame sensor: done, same result

2) check intake and vent: no obstruction

3) Replacing the ignitor: done, same result

And now I run out of ideas/options.

I even left the system on to check if it behaves as it should:

- kicks on
- does not ignite
- after about a minute shuts off
- repeats the cycle every 5 minutes

HOW CAN I GET IT TO IGNITE?

Thank you very much for your help and any hints!

Jack
 

pjones

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All those parts could have been verified first before spending money on them to replace them. Throwing parts at it is an expensive way to troubleshoot an issue and will end in a test of patience.

If you are unfamiliar with using a meter to test components then it is really hard to safely walk you through a procedure that could have you working around high voltage and high amperage items. It’s easy for a mistake to happen because we may assume you know of a hazard when you may actually not know of it. Since we can’t list all the hazards, or take that responsibility upon ourselves, it’s irresponsible of us to ask you to preform procedures without the proper training.

I don’t know what this forums policy is but I know that other forums restrict us from providing DIY advice on how to troubleshoot due to the above reasons.


I would recommend having a service tech visit to look at your equipment. Sometimes when a part fails it’s because there is another problem in the system that needs to get resolved. A pressure switch alarm can lead you down many paths all of which have a different outcome, without knowing how to test the required parts or what to look for then you are just guessing. Sometimes the fix it to replace a part but other times it is to correct an issue with the system that is causing the pressure switch to trigger. A trained set of eyes should be able to determine the direction and spot the issue fairly quick.
 

oldognewtrick

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Our policy is to not give any advice that could cause harm to an individual.
 
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