No power

[Tinstar]

My 2002 Monaco Windsor is parked at home in 0 degree weather. I turned the heat pump on 40 degrees to keep it thawed. I just went out to check and I found no power. I've got 50 amps going to the m/h and it's working. I opened my panel and the breakers are on (yes, I checked by throwing them off then back on). I've got a Xantrex RS2000 Sine Wave Inverter/Charger and when looking at the control panel it showed a FAULT --- "Contacts Welded". What does that mean and how do I fix it? Does that have anything to do with the heat pumps?

I know a heat pump doesn't work very well below a certain temperature but I wouldn't think it would cause them to not have any power at all.
I do have power at the thermostat and am able to cycle through the settings. OH, I nearly forgot, the batteries are at 13.2 volts and some outlets running from the inverter are powered with 120 volts so it's not a low battery issue.

Thanks for any help.

[valhalla360]

Do you have power at the 120v outlets in the RV?
- If not, that would support the idea it's in the transfer switch.
- If yes, it's likely not the transfer switch.

[wa8yxm]

At Zero degrees heat pumps should shut down (in fact long about freezing they should shut down) I doubt the heat pumps run through a 2000 watt inverter as they would shut it down due to overload.

Contact Xantrex to find if the inverter is still under warranty and cost of repair. There is also a Xantrex repair guy in Quartzite AZ but I have lost his contact info.

[MrWizard]

Sounds like transfer switch / relay contacts are stuck/welded together, this could be the TS inside the Xantrex,
That switches between shore power or inverter power
Could it be there was a power outage recently during the night, or a fluctuation brown out, heat pump is basically A/C in reverse, bringing in heat and blowing cold air outside, I don't know how your coach is wired, but switching power feeding running compressors is not good for the switch contacts, it could have happened automatically if shore power was interrupted, main TS for the RV, would have dropped out , and the Xantrex switch to inverter mode, then switch back to charge mode when shore power returned, fluctuations would cause more problems than than complete shore power outage, fluctuations would cause low and high voltage swings and current surges which could arc and pit contacts, you need to find and replaced the welded contacts, before more damage is done to the RV electrical system, contact a mobile RV tech to come look at your RV wiring