I have an AS 5000 gas furnace in my home. It is probably close to 15 years old. It has worked flawlessly up until just a few days ago. It will cycle "on" when told to by the thermostat. I can hear it "click" as it begins to cycle, the ignitor will come on, you can see the glow in the heat tubes and then it will click once or twice more and the glow will deminish. It will do this once or twice with the motor running, but the large blower fan in the bottom compartment will not switch on. The red light on the circuit board begins to blink red, but it simply flashes, no code or sequence. The tage on the board states for a "Flashing Red light, refer to your service manual". As the furnace was installed prior to us moving in 10 years ago, there is no service manual. If I turn the power off to the furnace and then immediately turn it back on again (via a "light swtich" on the side of the furnace near the control board) it will cycle/run just fine and heat the house. On occassion, will will cycle several times in a row as it should, before going back into its non-working/blinking mode.
Does anyone have any ideas what I should be looking at that may be causing this? I am guessing that it is a sensor or switch that has worn out, but I am not sure. The filter is brand new and I have even repalced the thermostat. I would rather not have to spend the $$ on a service call if I dont have to.
Thank Houston, I appreciate all the help I can get.
The furnace is model: TUC100B948AC
The serial number is: F30545736
The light flash's in no sequence. it simply blinks for however long it is allowed to until I reset it either by turning the power on and off at the switch, or by the cover switch for the lower half that houses the blower motor.
Go to Sears or HDepot, Radio Shack and buy a inexpensive electrical multitester. A good one can be had for under $100. Cheaper than a service call.
Is it a high efficiency furnace with plastic vent pipes or a mid efficiency one with a metal pipe to the chimney?
Pyratejim , I am having the exact same problem now a year after you , I was wondering if you could tell me what was your out come on this issue , Thank you Prosa
Turns out mine was nothing more than a dirty, and starting to crack, heat exchanger. Cleaned that up, as well as arond the sensors and pump and all works fine. Had a furnace company come out and recheck and all was good, except the cracked heat exchanger. Tried to sell me a new furnace for $5200.00. So far, furnace is working great this year, no issues and still havent replaced it. When I do, should cost me around $2,000.00, through a different company.
The furnace is in our lower utility room. As for the heat exchanger, it is located inside the furnace and I have no pics of it. If you scroll near the top of this thread, you can see a pic of the furnace as a whole.
Pyratejim , Thank you I do see that pic but not sure if it is the blower motor to the vent or what it may be I tryed looking up on lie but no real direction of were it may be.
Well after Five hundred bucks, it was a failed gas valve. Two clicks and a tap on it , fired up and need to be replaced.
:furious: for the bill :thumbup:for the Heat !
Just think how happy you made the contractor...now he can pay his rent and put food on the table for his children.:whistling2:
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