My weathermaker SX is old I believe 1985 or 1987 the coil keeps freezing up. My husband thawed it out and worked fine for a day. The next day it did the same thing. When we thawed it out nothing would work. The blower wouldn't even blow. Any advice?
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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.
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!)