It's back! I have a 90% Goodman furnace that has a problem I simply have not been able to figure out. It started last winter, and now has resurfaced again this year.
I will start from the begining, as I inherited this service call from another company. The basic problem is this when the homeowner wakes up at approx. 7am it is cold in the house. They have a white rogers prog. stat, that has been changed sveral times. I have went through the programming several times and am positive it should maintain the house at 72 by 7am.
The flue has been fixed as it had a sag in it and I first thought it might be water in the flue in the early morning hours causing the pressure switch to not make.
The pressure switch was new in 2004, before I inherited this call.
The inducer moter was changed last year as it was pulling over its rated amperage.
The static presure has been checked on the furnace, it is at a.6 total. Filter is always clean.
Gas pressure has been checked this year was at 3.46, has been very close to that every time i have checked it.
The furnace is rated at 10000 and have clocked the meter, it was very close to its rating last year when checked.
I have the homeowner trained to check for a diagnostic code when it is not working in the mornings, and we have all failed to ever have a diagnostinc code of any kind.
I have ran the furnace up seven even ten degrees by the stat and let it satisfy and have never even once seen it not get there, has always satisfied the stat and shut off.
The furnace control board was given to me by Goodman last winter to install, and that was put in to no avail.
I am out of ideas, the model # is back at the office if needed I will provide it to you, the furnace is only two years old, and had been a huge frustration to some very nice home owners, I would appreciate any help from anybody.
Thanks in advance, Mark