- My Forums
- Tiger Rant
- LSU Recruiting
- SEC Rant
- Saints Talk
- Pelicans Talk
- More Sports Board
- Fantasy Sports
- Golf Board
- Soccer Board
- O-T Lounge
- Tech Board
- Home/Garden Board
- Outdoor Board
- Health/Fitness Board
- Movie/TV Board
- Book Board
- Music Board
- Political Talk
- Money Talk
- Fark Board
- Gaming Board
- Travel Board
- Food/Drink Board
- Ticket Exchange
- TD Help Board
Customize My Forums- View All Forums
- Show Left Links
- Topic Sort Options
- Trending Topics
- Recent Topics
- Active Topics
Started By
Message
OT HVAC Experts
Posted on 7/26/17 at 8:02 pm
Posted on 7/26/17 at 8:02 pm
20ish year old central unit and 15-20 year old digital thermostat. A week or so ago the thermostat started showing "System On" but neither outside or inside units running. Turned the thermostat off, waited about 30 minutes, and turned it back on, and came on fine. Ran as normal for a couple of days.
Now it has begun doing this every time it calls for air. Turn it off, wait half an hour or so, and turn it back on, and usually it comes on, but sometimes takes more than one attempt.
Any ideas? Regular AC guy out of town till Monday, of course.
Now it has begun doing this every time it calls for air. Turn it off, wait half an hour or so, and turn it back on, and usually it comes on, but sometimes takes more than one attempt.
Any ideas? Regular AC guy out of town till Monday, of course.
7
Posted on 7/26/17 at 8:04 pm to Mikey Ballgame
How about starting with the least costly?
Posted on 7/26/17 at 8:06 pm to Mikey Ballgame
quote:
thermostat started showing "System On" but neither outside or inside units running. Turned the thermostat off, waited about 30 minutes, and turned it back on, and came on fine
quote:
urn it off, wait half an hour or so, and turn it back on, and usually it comes on, but sometimes takes more than one attempt.
Not an expert, but I would start with the thermostat or thermostat wiring.
Posted on 7/26/17 at 8:31 pm to WPBTiger
quote:
Not an expert, but I would start with the thermostat or thermostat wiring.
This....
Posted on 7/26/17 at 8:44 pm to Mikey Ballgame
MJ2 is locked up. Haven't you been reading the other thread...
Posted on 7/26/17 at 9:03 pm to Mikey Ballgame
I've had a bad thermostat do similar. It's a quick and relatively cheap procedure to try yourself before having to call a heat/air guy.
Posted on 7/26/17 at 9:21 pm to Mikey Ballgame
Could be a bad thermostat.
Also had a unit with similar symptoms where the control board went bad via cracks in the solder joints on the board. Sometimes it would work fine, sometimes not. Diagnosed by wiggling the wiring harness and was able to get the outside unit to cycle when the board made contact via moving the wiring harness. Do not fool around inside an energized unit unless you are competent.
Good luck.
Also had a unit with similar symptoms where the control board went bad via cracks in the solder joints on the board. Sometimes it would work fine, sometimes not. Diagnosed by wiggling the wiring harness and was able to get the outside unit to cycle when the board made contact via moving the wiring harness. Do not fool around inside an energized unit unless you are competent.
Good luck.
Posted on 7/26/17 at 9:33 pm to Mikey Ballgame
I agree with the others...sounds like a faulty thermostat. if you don't want to wait for your ac guy, anyone who is somewhat handy can install a replacement, since the wires should all be there.
Posted on 7/26/17 at 9:58 pm to Spankum
Thanks everyone. I'll start with the thermostat, I think I can handle that on my own.
Posted on 7/26/17 at 9:59 pm to Mikey Ballgame
You're dropping the 24 volt control voltage somewhere. The transformer could be failing. The thermostat could be failing. If there's a control board on the air handler/furnace, it could be failing. Whatever it is, it's dropping the voltage. If your setting on your thermostat calls for air, it will show "system on" even if the system isn't running. It doesn't know the 24 volts isn't "making" somewhere. Cross your fingers it's the stat or transformer. Inexpensive fixes.
Posted on 7/26/17 at 10:00 pm to Mikey Ballgame
Where are you located?????
Posted on 7/26/17 at 10:01 pm to Mikey Ballgame
What city are you in??
Posted on 7/26/17 at 10:02 pm to Mikey Ballgame
quote:
I'll start with the thermostat
Get a decent stat...programmable! And set the program to operate. The stat, when set properly, will save you a ton of cash in electricty.
Posted on 7/26/17 at 10:03 pm to moock blackjack
Is that a programable thermostat? Or just manual digital?
Posted on 7/26/17 at 10:07 pm to moock blackjack
If you decide to change the thermostat yourself, make sure you turn the power to your inside unit off. Then take pictures of the wiring before you disconnect. Get some 3/4 inch Sheetrock screws to mount on wall. They make a tighter connection.
Posted on 7/26/17 at 10:10 pm to moock blackjack
quote:
moock blackjack
Who do you run service for?
Posted on 7/26/17 at 10:27 pm to moock blackjack
Programmable
Posted on 7/26/17 at 10:31 pm to Mikey Ballgame
quote:
Thanks everyone. I'll start with the thermostat, I think I can handle that on my own.
just make clear notes (and pictures) of where every wire is attached on the existing thermostat. I have seen some HVAC folks mix up wire colors on more than one occasion....then when you connect to your new thermostat per the directions, it screws things up.
Posted on 7/26/17 at 10:32 pm to Mikey Ballgame
If it is an old programmable thermostat, some of them were 7 day programs or just every 24 hour programs. Could be stuck in some program and just don't realize it.
Posted on 7/26/17 at 10:46 pm to Tbonepatron
quote:Bitch had fire and 300 up votes and they killed it!
MJ2 is locked up
Page 1 of 2
Popular
Back to top
Follow TigerDroppings for LSU Football News