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OK everybody.

Thanks for all of the advise. It turns out it was the rollout switch - I checked it and it was passing the 24V, but apparently it was supposed to have a certain amount of resistance...

Thanks everybody.

I'll let you know what I find. I'm still messing with this unit. He's got back-up heat, so I've been using it as fill in work - which is OK with the business owner for now....

Coldtech,
What did you end up finding out on this unit? I'm having a similiar problem with a York rooftop. Was the problem intermittant or did it just not fire at all?

Need more info. What pressures is the unit running? Does the breaker trip right away? If you cleaned the evaporator, did you clean/check out the condensor? Is the condensor fan running/running at...

For those Techs who go up to 200 plus psi, can u usually hear the leak ???

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Yes. I have been able to hear leaks at that pressure. I...

I had to do the same thing badbillr is suggesting with a Leibert unit. Seems like a lot of work but it's worth it. This unit was in a computer room - line set ran up 6 floors through a chase I...

If you really want to get fancy you can install a trap before the T. The trap is there to prevent ambient air (and odors) from being induced into the air stream. The clean out idea from beenthere is...

Take the standard package and put the $4400 into something that will make the wife happy. Or better yet, a bigger garage. It'll take quite a while to make up the 4% on the furnace and even longer...

You've got to be careful - even with the 123z. You've got to weigh in the charge - 30% (or about one third) of the total charge is what you're looking for. A co-worker of mine guessed at it once...

Rob, why would you replace a furnace that is running fine? If it is just because of the manufacturer it doesn't make any sense. If the unit was properly sized and installed and it has been running...

I have been slowly growing my business for about 4 years and am just now buying a combustion analyzer. I know that you guys are probably going to tear me up and call me a hack for not owning one yet,...

If the unit was running when you read your gages you still only had 20 lbs of differential - no matter how you connected to the unit. That's not good.
I like millerman's idea. It would be a good...