Question about Heating & Cooling
I have just bought a house with carrier weathermaker sx furnace. When I turn it on burners start, blower comes on but after a couple of minutes burners shut down and blower keeps running. The whole cycle repeats once every half an hour. I have thermostat set to the maximum but furnace
keeps doing the same. The temperature in the house stays almost 50 degrees. I called service and was told to have control board replaced. After spending almost 500 dollars, now I am being told to replace the furnace.
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!)
Posted on May 01, 2010
I've had a Carrier 58SXA100 since the 1980's. In the first 30 years of use , the problems with the furnace could all be traced to plugged drain lines. The furnace drains water into a cylindrical plastic tranp and out of it through a tube. If any part of the drain system gets clogged then water can back up into the lines of the vacuum switch and prevent the furnace from igniting the main burners or cause it to cycle on-and-off. It's fairly easy to take off the trap and the drain lines and clear them out. Also clear the vacuum lines and the orifices where they are attached.
In the past year, the pilot assembly went bad. The furnace would ignite the pilot and shortly after the main burners ignited there would be a click from the igniter relay and the burners would shut off - apparently due to some fault with the bi-metal switch in the pilot assembly. This cycle would repeat.
You can find useful Youtube videos about diagnosing the problems of Carrier furnaces "short cycling". However, keep in mind that the 58SX is an old furnace. It doesn't display error codes and I don't think it has a "flame sensor" like modern furnaces - instead, the bi-metal switch in the pilot assembly is supposed to sense if a normal flame is going.
Posted on Nov 23, 2017
Just had the same problem My SX does not have diagnostic codes or readout, 1st generation. The Pilot proof switch in the main burner was intermittant burner would light then go out after a bit then the pilot would warm the bi-mettalic strip and the main burner would come back on. Check the web for price mine was a 3 wire electronic ignition pilot. Another problem I had was the HFR relay burned up the contacts, Granger has a supply of these so I replaced them.
Posted on Dec 20, 2007
I think Hotuna may be on to something. This unit has an internal diagnostic circuit that blinks a code when something goes wrong. To view it, remove the main access cover. You will noticee a small clear plastic window. Document all blinks you see. On the reverse side of the cover you will find a sticker with the diagnostic codes spelled out. Let us know what you get and we can assist you further.
Posted on Dec 19, 2007
This sounds like a thermal disc or the heat anticipator on the thermostat is not set right. What was the $500 spent on?
Posted on Dec 19, 2007
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Posted on Jan 02, 2017
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