AC not working in shore power

Hello, we have a 2004 2350. Yesterday the Ac worked fine while we were plugged in.. we turned it off in the evening.. all good.. Today it will not turn on.  Not the fan or the Ac.. it will run when the generator is on.. any suggestions what we should check.. we rarely use the AC, maybe 3x/yr.. needing it now for the dog. We have not moved the RV . Thanks for any words of wisdom

Are you saying A/C runs with generator but not Plugged into power? Then check breaker on post plug-in.

Breakers are fine.. the fridge is running on AC just not the AC.. Dumb question.. is there also a fuse? There a bunch of 20 amp fuses and 2  35 amp ones.. nothings is labeled
Thanks

Hard to believe the A/C cares where the juice is coming from.  Are you sure the fridge isn't running on gas?  Do you have an inverter?  Surely, it's not running off the inverter.  I don't have one, so I don't know what all it powers.

I think the fuses are only for the 12v circuits, but it's easy enough to pull them and look to see if one is blown. 

If your 2004 is anything like my 2008, there is a metal box inside one of the dinette benches that has a relay in it.  I'm just guessing, but I'm pretty sure its purpose is to switch between shore and generator power, to keep the generator from back-flowing to the power pole.  If that's the problem, it'll probably have to be replaced, but sometimes you can bang on a relay to get it working, if it's just stuck.  Bang on the box, not the relay (unless the power's unplugged and the generator is off).

Breakers are fine.. the fridge is running on AC just not the AC.. Dumb question.. is there also a fuse? There a bunch of 20 amp fuses and 2  35 amp ones.. nothings is labeled
Thanks

Question...

 Status: Generator off.  A/C off.   Fridge is running on shore power   ("AC") .   When you try to turn on the A/C , does the fridge display change at all?  Blink?



A test... Rednek tested and approved.      Practice first, get the communications and timing set.


Two people needed.  Shore power ready, plugged into the 'post' but NOT into the coach. Generator running.

Put the A/C on fan only. any speed.  Also start the fridge, set to AC power.

Now with the generator running, shout to your assistant and have them plug the shore power into the coach.

A/C still running?  Fridge display ok?  Wait one minute then check again.



Now have your assistant come in, and turn off the generator. Keep watching the fridge display. When the generator stops, what does the A/C do? Also note any changes in the fridge display.


I would do the same to my 2006 should I have the same situation you describe. It is very odd.  However, you do so at your own risk. For all you know I am a trained monkey typing on a phone.  This is the internet...     If any part of that test makes you uncomfortable, PLEASE do not try it. 

 

Volkemon, your posts are always so entertaining while also being helpful.. we left the in-laws and now all is good! Go figure ... but I am saving your post just incase

Volkemon, your posts are always so entertaining while also being helpful.. we left the in-laws and now all is good! Go figure ... but I am saving your post just incase

Thanks!  I am sure others may not see the humor sometimes.

And... ""we left the in-laws and now all is good! ""

SO.... Everything works now?!?   Or you are doing that battle another day?     OCD minds want to know! . 

Volkemon, your posts are always so entertaining while also being helpful.. we left the in-laws and now all is good! Go figure ... but I am saving your post just incase

RVing 101

An air conditioner requires a 30 amp electrical source

Residential circuits are 15A or 20A

A 30A shore power cord with a 20A adapter plug is just a 20A extension cord.

Breakers are fine.. the fridge is running on AC just not the AC.. Dumb question.. is there also a fuse? There a bunch of 20 amp fuses and 2  35 amp ones.. nothings is labeled
Thanks

Yes, there are circuit breakers in the power panel of the PC, but it's the same breakers used on any source of 120v power.  There's also a transfer switch that when it senses power from the generator, waits about 20 seconds and then switches your 120v from shore power (if plugged in) to your generator power.   But again, if your refrigerator is actually running on shore power... That transfer switch is working.

Just saying

An easy way to determine if 110V is truly working off shore power and then off generator power, is to run your microwave oven because it is the next biggest power-using item that is easy to test with.  So, if your microwave oven works properly, but your roof a/c doesn't, then you know the problem is within your PC, and not the power source.

Quote from: Skier1985 on September 19, 2020, 10:15:20 pm

Volkemon, your posts are always so entertaining while also being helpful.. we left the in-laws and now all is good! Go figure ... but I am saving your post just incase

RVing 101

An air conditioner requires a 30 amp electrical source   

Residential circuits are 15A or 20A

A 30A shore power cord with a 20A adapter plug is just a 20A extension cord.

My 13,500 unit seems to work fine on the end of a cord coming from a 15A house outlet. Adapter to shore power cable.  Used this method several times going to music gigs and parking in back yards for the night. Dont run ANYTHING else however!!

Forgetting the water heater is on electric has been a problem in the past, it is our first go-to now when on limited power.

I got it to run on a 2000w honda quiet generator by running the A/C on high 'fan only' first, then QUICKLY switch it over to  'low cool'.  Cycles the compressor after that, but the genset does struggle. Got us through the night. 

An easy way to determine if 110V is truly working off shore power and then off generator power, is to run your microwave oven because it is the next biggest power-using item that is easy to test with.  So, if your microwave oven works properly, but your roof a/c doesn't, then you know the problem is within your PC, and not the power source.

   GOOD TEST 

I was looking for the fridge change from AC to LP ( if on auto, or fault if not) .  The fridge uses 12V for control, so should not 'care' if the transfer switch works, except when commanded to run off AC.  Donc13 had the same thought - "" But again, if your refrigerator is actually running on shore power.""



 Heck, you can just run the generator, the microwave display should turn on. If you swap over to shore power, display SHOULD stay on, if it does not, might pinpoint this problem to the transfer switch. If the microwave lights/works on genset AND shore, well... mystery deepens.