1986 Weathermaker SX 150 series, model S85X060-CC-1
Furnace has been serviced regularly each year. Ran fine last winter, air worked fine all summer when needed. When I turned thermostat to heat and dial up to call for heat the inducer fan starts and the ignition lights the pilot, but the burners will not kick on. Oh, I should correct myself. Last winter, 1 time the burners would not light for a few hours and when I shut off the power and checked everything I could (connections, etc..), I turned the power back on and it worked fine the rest of the winter. Any thoughts?
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Re: 1986 Weathermaker SX 150 series, model S85X060-CC-1
There are 4 -steps for full run time to kick in a furnace.. step-1, inducer fan runs & prove thru the air tube which closes a switch and tell the circuit board to go to step-2, the igniter lights the pilot & prove its lit by heating the thermocouple, which tells the circuit board to go to step-3, opens the gas valve to dump gas in, which will light from the pilot light, and prove by a flame sensor metal stick on the last burner , which heats up and tell the circuit board Saying, ok , I've got flame.. step-4. when the box heats up, it closes a switch and turn on the main fan...! (Some gas-valves has a brain -or circuit board on top of them and are real sensetive to moisture..)
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I believe this is the furnace with a spark to light the pilot light. If so the best advice I can give is to replace the whole pilot assembly. There is a very old style flame sensor in there that is not serviceable. This has driven many a technician around the bend.
**NOTE: It is a real pain to get out, and back in. You need to take off the fire box cover and the panel underneath it to get it out. You also need to take the pilot tube off the gas valve. This may be something that you want to call a service tech for. It could be a little tricky and because you are dealing with gas, you want to make sure that it is put together correctly and safely.
Hello,The board may have a fault code led light that blinks a series BEFORE you shut the unit off/on(helpful in pointing you in a direction)there may be a peephole to see the lite in the door as there is a door switch inside that will reset the board erasing the fault.Intermittent problems are the pressure switch more often than not.
Hi and welcome to Fixya. I believe that the wind is affecting the draft. What I would recommend is to install a cap on the flue that is similar to a weather vane in that it rotates to block the wind from creating a downdraft in the flue. Some times depending on the direction and strength of the wind it will come up over the roof peak and then down the flue. A regular fixed cap may work too. You should be able to purchase one at your local hardware store. Please let me know if this was helpful. Good luck.
The carrier sx series went through a number of control systems over the years. can you find the full model, and series numbers? They are located behind the door on the left side. (i.e. 58 sxc080-100 series100)
Remove all power from the furnace, it is likely the brain in the furnace is need of being reset, from the battery replacement, why did you change the battery, was there an indicator telling you to change it?
Many times just removing all the power to the furnace will do the trick with a reset, if not let me know and we will go from there, but it sounds like the main brain is confused or bad, more likely confused, so try the power removed first.
I have serviced these furnaces for 20 years and I can tell you most of these models did not have diagnostic lite on them. (although some did, especially if the control board has been replaced) The problem is most likely a bad 3 wire pilot. This will cause exactly what you describe. 2 things to consider though. 1, If you were to replace the pilot don't get a cheaper knockoff. In my experience these do not last long at all. Get the right one from a carrier dealer. It will cost more but be much more reliable. 2 What is the condition of the secondary heat exchanger? Most if not all of the sx series had issues with the secondary heat exchangers rotting out and leaking. If the furnace is out of warranty you would be much better replacing the furnace as the cost of replacing the secondary heat exchanger will probably be almost the same as a new furnace. ( those babies are EXPENSIVE!)