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Message
AC question
Posted on 6/25/22 at 9:37 am
Posted on 6/25/22 at 9:37 am
Upstairs thermostat went completely dead. As I was removing the old I checked for voltage on "C" which is 24 volts and nothing. Went ahead and replaced it to match the Honeywell digital we have downstairs. Of course it didn't work with no power coming to it. Called an AC company out.
AC company said board was fried and it took 5 days for them to come back with new board. Guy just left and said we have an electrical problem. Said he is only getting 64 volts to the unit in the attic. Thinks we have a broken wire or a bad breaker that is not providing 110 volts. Very skeptical on this.
Anyone have any thoughts or should I just get an electrical company out here to troubleshoot?
AC company said board was fried and it took 5 days for them to come back with new board. Guy just left and said we have an electrical problem. Said he is only getting 64 volts to the unit in the attic. Thinks we have a broken wire or a bad breaker that is not providing 110 volts. Very skeptical on this.
Anyone have any thoughts or should I just get an electrical company out here to troubleshoot?
3
Posted on 6/25/22 at 9:49 am to Tridentds
You might have a blown fuse on the unit. Take off the cover where the circuit panel is and see if there is a inline fuse and if it's blown. I blew one changing a thermostat and not killing power first
This post was edited on 6/25/22 at 9:52 am
Posted on 6/25/22 at 10:20 am to MSGulfTiger
Okay, I pulled cover off the outside unit and don't see a blown fuse or a reset. Assume you are talking about the attic unit?
This post was edited on 6/25/22 at 10:23 am
Posted on 6/25/22 at 10:21 am to Tridentds
Your indoor/attic unit will run on 110 and there will be an outlet for it.
Test that outlet and see what it is putting out and narrow it down from there.
Test that outlet and see what it is putting out and narrow it down from there.
This post was edited on 6/25/22 at 10:22 am
Posted on 6/25/22 at 10:23 am to bbvdd
quote:
Test that outlet and see what it is putting out and narrow it down from there.
Okay, it's a scorcher up there.
Posted on 6/25/22 at 10:32 am to Tridentds
Understand, All 3 units are in my attic as well as water heaters.
Posted on 6/25/22 at 10:35 am to Tridentds
Thinks we have a broken wire or a bad breaker that is not providing 110 volts.
--
That sounds like a sound diagnosis.
What did he suggest?
--
That sounds like a sound diagnosis.
What did he suggest?
Posted on 6/25/22 at 11:01 am to bbvdd
Okay so the 2 units in the attic are wired to side by side switches. Unit that is running shows 122.85 volts. Unit that is not running shows 123 volts coming to switch. I flipped switch on and it shows 123 volts after switch.
Definitely not a bad breaker or a broken wire coming from the breaker box.
Definitely not a bad breaker or a broken wire coming from the breaker box.
Posted on 6/25/22 at 11:03 am to Tridentds
Now check the plug wire that runs into the unit.
Posted on 6/25/22 at 11:05 am to ItzMe1972
quote:
What did he suggest?
He said we need to call an electrician. Of course this is the same guy that diagnosed a bad circuit board but didn't spot the low voltage issue he discovered today. Still not sure how he diagnosed low voltage.
Wouldn't surprise me if the old circuit board was just fine and he was just changing parts.
Posted on 6/25/22 at 11:10 am to Tridentds
quote:
Okay, it's a scorcher up there.
send wife to do it
Posted on 6/25/22 at 11:10 am to bbvdd
Will follow the wires from the switch into the unit. Assume they will be attached to terminals. Check voltage at this spot to determine a fault in wire from switch to unit? Is this correct?
Posted on 6/25/22 at 11:14 am to Tridentds
Yep, most likely it’s something easy like a blown fuse and a cheap part.
Sounds like the guy didn’t know what he was doing and like you said, changing parts without diagnosing the issue.
Sounds like the guy didn’t know what he was doing and like you said, changing parts without diagnosing the issue.
Posted on 6/25/22 at 11:27 am to Tridentds
quote:
Okay, it's a scorcher up there.
Half of my sprinkler system isn’t working right now.
Pretty certain the common wire to the valves is messed up somewhere. I just really don’t feel like hunting it down in this heat, like you said. Although outside is much different that the attic.
Posted on 6/25/22 at 11:36 am to bbvdd
Voltage at unit. Don't see any blown fuses. Connections look good.
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[/img] Posted on 6/25/22 at 11:40 am to Tridentds
If he did in fact change the board out then I wonder if it could be the fan?
Is the unit outside running?
Is the unit outside running?
Posted on 6/25/22 at 11:44 am to bbvdd
Welp... after checking voltage I reconnected wires. As I was tightening the wire nut the fan came on and the gas heater came on for 5-10 seconds and shut down. Came down and themostat now has power and is working. AC is cooling. I guess it needed a passive reset of some kind.
Appreciate the assistance my good man.
Going to get a big glass of cold tea, cool down, and get on the phone with the AC company. They got an arse chewing coming.
Appreciate the assistance my good man.
Going to get a big glass of cold tea, cool down, and get on the phone with the AC company. They got an arse chewing coming.
Posted on 6/25/22 at 12:18 pm to Tridentds
Something similar happened to me last week when I changed a capacitor. Needed to rest a bit first I guess.
Posted on 6/25/22 at 12:38 pm to Tridentds
Welp... after checking voltage I reconnected wires. As I was tightening the wire nut the fan came on and the gas heater came on for 5-10 seconds and shut down. Came down and themostat now has power and is working. AC is cooling. I guess it needed a passive reset of some kind.
-----
Looks like you found a loose connection which may have caused a low voltage reading.
Glad you're going again and have tea to cool down.
-----
Looks like you found a loose connection which may have caused a low voltage reading.
Glad you're going again and have tea to cool down.
Posted on 6/25/22 at 10:17 pm to Tridentds
In my experience, AC technicians have gotten very poor at their job but all think they’re great. Problem I have with companies is they do t always send the experienced techs. So I keep having to change companies or figure it out myself like you did.
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