I have a 2009 Sundancer 310. The...

[DJH]

 I have a 2009 Sundancer 310. The air-conditioner works fine on the generator and at a resort marina that we  visit. My problem is that  at my home marina it shuts  it self off and gives a Error code of LO/AC. I changed slips to a 50 amp supply and used a converter to connect my 30 amp cord but I still get a LO/AC code and it shuts itself off.  Could I still be getting low voltage at the 50 amp supply? Could my power cord be the problem? 

[Wolfman]

I would suspect that the problem is with the power supply at your marina if you don’t have that same problem elsewhere. The 30 and 50 amp service come from the same power source to the marina.

[wingless]

What input AC voltages are displayed by the panel meters when the fault is detected? What voltages are displayed when the A/C is happy when running off the generator?

[DJH]

The voltage is higher on the generator, around 120. I measured the voltage at the end of my power cord and it was 113 on the 30 amp service. The panel meter has always read greater than 100. It’s my understanding that the air-conditioner will shut itself off if it has less than 100 V for three minutes. Since the panel never has read less than 100 I am starting to think that it may be something to do with the Air conditioning unit itself or maybe the power cord leading to the unit from The onboard power distribution center.

[wingless]

The panel shows 120 on the generator and the panel shows 113 on shore power? If so, then the supply received by the boat is fine. (The panel meter isn't a calibrated instrument, but falls into the "good enough" category.)

If the boat has sufficient voltage, then carefully / safely expose the line voltage at the A/C junction box.

Safely use a DVM to read the line voltage at the A/C during operation.

[DJH]

Thank you for your help.