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Generator not starting main A/C outside compressor or condenser fan.
Posted on 9/3/21 at 1:05 pm
Posted on 9/3/21 at 1:05 pm
My generac 22kW generator tripped last night due to low oil. I had the supplies already bought, but put it off a day. Changed oil, plugs, and oil filter and it fired up sounding perfect.
Now my ac compressor and fan will not kick on. The generac load limiter connected to the AC fuse is blinking 1s.
Capacitor looks good, main fuse box was checked. I disconnected the switch, turned AC on, the reconnected the switch and nothing turns. Pushed the blades with a stick and the fans rotate freely.
Why isn’t my generator powering the AC compressor and fan?
Now my ac compressor and fan will not kick on. The generac load limiter connected to the AC fuse is blinking 1s.
Capacitor looks good, main fuse box was checked. I disconnected the switch, turned AC on, the reconnected the switch and nothing turns. Pushed the blades with a stick and the fans rotate freely.
Why isn’t my generator powering the AC compressor and fan?
8
Posted on 9/3/21 at 1:07 pm to The Goon
Batteries out in your digital thermostat?
Posted on 9/3/21 at 1:08 pm to Bullfrog
Batteries are good. The blower kicks on when told.
Posted on 9/3/21 at 1:09 pm to The Goon
Check the 3 fuses on your transfer switch, N1, N2, or T1
Posted on 9/3/21 at 1:11 pm to The Goon
With the generator tripping like that you want to check your breakers on the inside unit and if there are any breakers on the outside unit. It does sound like a capacitor though.
Posted on 9/3/21 at 1:14 pm to The Goon
do you have power coming out of the A/C breaker? i recently changed my capacitor and unit still would not run. checked a/c breaker and had no power coming out. i bypassed my a/c breaker for the night until i bought one the next day and worked fine after. really don't know what caused this... only thing i can think of is that i didnt turn off the a/c when i installed the capacitor and it has stored power running to breaker.
This post was edited on 9/3/21 at 1:18 pm
Posted on 9/3/21 at 1:21 pm to Bazzatcha
I see large wires that are beyond my scope to jiggle around with in the transfer switch. What exactly am I looking for?
Posted on 9/3/21 at 1:23 pm to The Goon
quote:
I see large wires that are beyond my scope to jiggle around with in the transfer switch.
Call an electrician
Run a couple window units for now
Posted on 9/3/21 at 1:25 pm to The Goon
Put a fresh capacitor in the compressor.
Also, check the AC label/ manual to make sure your capacitor is the right size/ big enough.
Don't assume the one you take out was the right size. I've had two overpriced techs install whatever they had on the truck.
Also, check the AC label/ manual to make sure your capacitor is the right size/ big enough.
Don't assume the one you take out was the right size. I've had two overpriced techs install whatever they had on the truck.
This post was edited on 9/3/21 at 1:30 pm
Posted on 9/3/21 at 1:38 pm to Bazzatcha
quote:
Check the 3 fuses on your transfer switch, N1, N2, or T1
A quick google search and opening the panel again, all three fuses are intact.
Posted on 9/3/21 at 1:39 pm to The Goon
Make sure you’re getting 230/208V at your condenser unit. Also check the micro ferrules on the capacitor to see if it still holds the correct values.
Posted on 9/3/21 at 1:43 pm to The Goon
quote:
Now my ac compressor and fan will not kick on. The generac load limiter connected to the AC fuse is blinking 1s.
Here is what worked for me. The load shifting panels go bad often, and the control board gets burnt.
Disclaimer - I'm not an electrician, do this at your own risk, this isn't advice or a recommendation. Consult an electrician. Working on electrical devices can kill you, so I always turn off devices, cut power at the breaker box, pull fuses, etc.
If you have a newer model load limiter panel, there is a work around I used. First, I turned off the ac at the thermostat, and pulled the connection at the outside breaker box for the compressor. This cut power to my load limiter panel. Next, removed the 4 screws on the cover, and the two smaller screws inside holding the control board. There is a connection to the control board and the wiring - I disconnected this, and pulled the board. After, I screwed the panel lid back into place.
Reconnected the connection in the compressor breaker panel, and set everything ready to run.
The newer Generac load limiters will then operate like a direct connection. If you have an older one, it simply will cut power to the AC. Restarted the generator and let it warm up. Flipped the breaker on the generator to take on load. Once the generator was running, taking load, then turned the AC unit on.
Remember, if you have multiple units, it won't stagger start any longer. I used the AC with discretion, only running certain units as needed.
The other issue I found, is the gas supply would be insufficient at times. If you use gas in the house to cook or for the hot water heater, it can starve the generator and cause a shut down.
This post was edited on 9/3/21 at 1:46 pm
Posted on 9/3/21 at 2:09 pm to GetBackToWork
Thanks for all the replies. I think all the AC units were running when the generator tripped at night. All the ac units came on at once when the generator kicked back on and tripped the power shed. I turned the ac units off at the thermostat, powers the generator down for 30 minutes, then turned it on with one AC at a time.
FYI when everyone is changing oil, turn your thermostat off.
FYI when everyone is changing oil, turn your thermostat off.
Posted on 9/3/21 at 2:14 pm to The Goon
Go check your 3 or 5 amp fuse in your air handler in the attic
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