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Message
A/c issue after lightning strike. Any help appreciated
Posted on 3/15/19 at 11:54 pm
Posted on 3/15/19 at 11:54 pm
Two units. One upstairs, one downstairs.
Both Nest thermostats. Love them. No problems.
Lightning last night hits our house or right by it. Trips four breakers in the breaker box. All downstairs was ok, but it tripped three breakers in upstairs bedroom and one in bathroom. Both cable boxes and modem are off completely, I’m guessing fried. (This is an easy fix).
My problem:
The downstairs a/c is fine.
My upstairs a/c will not come on. The thermostat is reading that no power is coming in to the thermostat. The a/c breakers were never tripped.
Any advice?
Both Nest thermostats. Love them. No problems.
Lightning last night hits our house or right by it. Trips four breakers in the breaker box. All downstairs was ok, but it tripped three breakers in upstairs bedroom and one in bathroom. Both cable boxes and modem are off completely, I’m guessing fried. (This is an easy fix).
My problem:
The downstairs a/c is fine.
My upstairs a/c will not come on. The thermostat is reading that no power is coming in to the thermostat. The a/c breakers were never tripped.
Any advice?
This post was edited on 3/15/19 at 11:55 pm
13
Posted on 3/16/19 at 12:32 am to pwejr88
Compressor is grounded out
Posted on 3/16/19 at 12:35 am to rsbd
Can I fix that?
How?
How?
Posted on 3/16/19 at 2:31 am to pwejr88
if no power is coming into the thermostat that power typically comes from the furnace inside, if its an electrical furnace there is usually another breaker on the furnace itself. if thats ok, it could be the transformer inside of the furnace, its a simple 120-24v thats not super hard to change. if all of that checks out then call someone.
Posted on 3/16/19 at 4:40 am to pwejr88
Call your insurance company and keep good records.
Posted on 3/16/19 at 5:01 am to cajuncarguy
Had to replace my outside unit last year because of this
Posted on 3/16/19 at 7:05 am to pwejr88
You should have a breaker or fuse box near your compressor. Check that. There is also likely a control board inside the furnace if you have a gas furnace, I'd assume something similar if you have a heat pump or electric heating. That may have a fuse(s) or even a breaker type trip and is probably the source of your thermostat power.
All of this from memory but the long and short is check near your outside unit for a fuse and/or breaker box. Check your inside unit for fuse/switch and that the controller unit isn't fried.
ETA if you have a reasonable price AC guy you use that you trust not to screw you, call them if uncertain. If you're in the Lafy area I can recommend the guy I call when I can't or don't have time to do it myself.
All of this from memory but the long and short is check near your outside unit for a fuse and/or breaker box. Check your inside unit for fuse/switch and that the controller unit isn't fried.
ETA if you have a reasonable price AC guy you use that you trust not to screw you, call them if uncertain. If you're in the Lafy area I can recommend the guy I call when I can't or don't have time to do it myself.
This post was edited on 3/16/19 at 7:08 am
Posted on 3/16/19 at 7:16 am to pwejr88
Breakers protect the wiring and not the unit. Better check that outside unit for damage.
Posted on 3/16/19 at 7:40 am to pwejr88
If lightning strike use it as a cheap way to get a new unit through insurance
Posted on 3/16/19 at 7:51 am to pwejr88
Lightning damage, call insurance and HvAC guy. Things that normally have issues, garage door openers, low voltage home phones, sometimes fridges and stoves. Every home is different and sometimes it takes a little time to determine what all was damages
Posted on 3/16/19 at 8:21 am to pwejr88
Try flipping the breaker off then back on. Sometimes they dont look tripped but are.
Posted on 3/16/19 at 9:57 am to pwejr88
Our 6 ton package unit was fried from a power surge coming into the office. It was a 40+ year old unit and worked like a champ prior to hurricane Michael. It fried every major component on the unit. Nothing else at the office was affected including a 10 ton package unit that is15 years old.. Our HVAC tech had as much of an explanation as we did. File a claim. If possible have your HVAC tech meet at the same time as the insurance adjuster. He can go over everything with the insurance adjuster. I’m sure they’ll want to send out a “specialist” to look at it as well.
Posted on 3/16/19 at 10:01 am to pwejr88
I have had this before. It turned out to be the control board on the furnace. You probably want to check for fuses and the transformer as well.
You may want to check your deductable before calling the ins co. I replaced my own ac board, and garage door opener for way less than my $1k deductable.
You may want to check your deductable before calling the ins co. I replaced my own ac board, and garage door opener for way less than my $1k deductable.
Posted on 3/16/19 at 10:14 am to pwejr88
I had lightning fry a control panel upstairs. Although I do most small jobs myself, an A/C guy was needed to diagnose and fix it. Good luck.
Posted on 3/16/19 at 11:02 am to pwejr88
May have popped the low voltage fuse on the inside unit. There will be a 3 or 5 amp fuse that the low voltage running from thermostat to unit to control is going through. Any little surge will pop them. Check that fuse out
Posted on 3/16/19 at 1:04 pm to Jvalhenson
Is that on the unit in the attic?
Posted on 3/16/19 at 1:31 pm to cajuncarguy
quote:
Call your insurance company and keep good records
Yep. shite happened to me last year. It fried all kind of crap in our house. Ended up costing like 3-4k
Posted on 3/16/19 at 1:31 pm to Jvalhenson
quote:
May have popped the low voltage fuse on the inside unit.
I've had that happen before also. It will be located on a small circuit board, usually within or mounted onto the blower motor housing.
Posted on 3/16/19 at 7:16 pm to cdaniel76
Found the fuse inside the unit on the circuit board and it wasn’t tripped either.
Guess it’s the circuit board or the transformer.
Guess it’s the circuit board or the transformer.
This post was edited on 3/16/19 at 7:20 pm
Posted on 3/16/19 at 9:28 pm to brew400
This sounds like the most logical answer. It doesn’t take much of a voltage spike to fry those control transformers
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