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HVAC motherboard question
Posted on 6/5/26 at 10:14 am
Posted on 6/5/26 at 10:14 am
Morning all - anyone have experience with HVAC motherboards by chance? I was running 18/5 thermostat wire last night for a new thermostat I got. Instead of using the power extender kit, I decided to run new wire. Well, as I'm loosening the C-wire, the whole C terminal block snapped off at 10pm which was great to be without A/C 
Anywho, I connected it up and tested the unit and it seems to be working just fine even with the broken terminal.
If anyone has experience with this, please share as I'm all ears and can solder it back if needbe. TIA!
Anywho, I connected it up and tested the unit and it seems to be working just fine even with the broken terminal. If anyone has experience with this, please share as I'm all ears and can solder it back if needbe. TIA!
3
Posted on 6/5/26 at 10:36 am to idlewatcher
Good for you that you could make a temp patch work, but soldering is a better solution.
Looks like an older board/system - get the model/part number off the furnace or board and see what a new one would cost you. A few years back with my old HVAC furnace-air handler I priced a OEM replacement control board online (furnace was manufactured in 2007) just in case I needed one, and as I recall it was couple hundred $.
You might want to get a replacement board before you attempt soldering the old terminal just in case things go south on you as it often does for me…..lol. I never did buy the board as opted to replace my system, as it was 16 years old, and there was a slow leak in the evaporator coil.
Looks like an older board/system - get the model/part number off the furnace or board and see what a new one would cost you. A few years back with my old HVAC furnace-air handler I priced a OEM replacement control board online (furnace was manufactured in 2007) just in case I needed one, and as I recall it was couple hundred $.
You might want to get a replacement board before you attempt soldering the old terminal just in case things go south on you as it often does for me…..lol. I never did buy the board as opted to replace my system, as it was 16 years old, and there was a slow leak in the evaporator coil.
This post was edited on 6/5/26 at 10:47 am
Posted on 6/5/26 at 10:36 am to idlewatcher
Nice air filter! 
Can you post furnace M# and S#? That looks like a common and relatively cheap board. there should be a number on the board as well.
Can you post furnace M# and S#? That looks like a common and relatively cheap board. there should be a number on the board as well.
Posted on 6/5/26 at 2:04 pm to idlewatcher
quote:
the whole C terminal block snapped off at 10pm which was great to be without A/C
I learned that lesson a long time ago. Don't start doing shite like this late at night so when I eventually frick something up I'm not stuck until the next day to replace whatever it is I broke.
Posted on 6/5/26 at 10:57 pm to boxcarbarney
Posted on 6/11/26 at 8:22 am to Wraytex
quote:
Nice air filter!
No joke right
quote:
Can you post furnace M# and S#? That looks like a common and relatively cheap board. there should be a number on the board as well.
I can but my question is more geared to what is behind the terminal. Is there a contact of some sort behind the terminal that I could solder?
So far everything is working although I'd feel more comfortable getting it fixed.
Sorry for the delay and thanks to the 4 posters who have responded
Posted on 6/11/26 at 8:24 am to CrawDude
quote:
You might want to get a replacement board before you attempt soldering the old terminal just in case things go south on you as it often does for me…..lol.
Definitely a forward thinker. Appreciate your input kind sir.
quote:
but soldering is a better solution.
As stated to Wray, I'm wondering what is behind it? A contact of some sort or what? I know just enough to get myself into trouble. My A/C guy said it could be soldered no problem; however, I need to know a bit more before attempting to do so.
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