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Tinstar

McKinney, TX

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Posted: 02/15/21 10:29pm Link  |  Quote  |  Print  |  Notify Moderator

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.

* This post was last edited 02/15/21 10:54pm by Tinstar *   View edit history


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MrWizard

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Posted: 02/16/21 02:14am Link  |  Quote  |  Print  |  Notify Moderator

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


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wa8yxm

Wherever I happen to park

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Posted: 02/16/21 04:24am Link  |  Quote  |  Print  |  Notify Moderator

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.


Home is where I park it.
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after a semi "nicked" it. Still have the radios
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valhalla360

No paticular place.

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Posted: 02/16/21 05:37am Link  |  Quote  |  Print  |  Notify Moderator

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.


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The Western States

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Posted: 02/16/21 07:01am Link  |  Quote  |  Print  |  Notify Moderator

The manual shows an external TS for shore/gen, then the charger/inverter then the CB panel. This suggests that any charger/inverter internal TS contact problem could effect all AC power including the heat pumps.

A number of different problems with the heat pumps or elsewhere could cause a contact issue. A power outage problem cause contact arcing as the power goes off and on. Including the inverter switching on/off to supply AC power to the panel.

While my chager/inverter is not a whole house type unit I never leave the inverter on which allows automatic AC switching. I also turn off all loads before connecting/disconnecting AC shore power. Both of these significantly reduce relay contact arcing.


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Bob


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Posted: 02/16/21 07:09am Link  |  Quote  |  Print  |  Notify Moderator

Heat pumps don't work at 0F and I would not leave them on at 0F. In fact I have 2 dedicated 20A circuits for ceramic heaters. The water area includes both a DC heater and AquaHot register. This leaves the fresh water tank which is only protected by the AquaHot.

Therefore in really cold weather I'd use the electric heaters and Aquahot or winterize.

MURPHY55347

Savage, MINNESOTA

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Posted: 02/16/21 08:47am Link  |  Quote  |  Print  |  Notify Moderator

Last fall we got into some weather that was about 20 degrees while using the heat pumps. Got up at 3:00am to the smell of electrical smoke but everything was still running. Did not expect it to run at that temp. Upon investigating in the morning found the transfer switch had fried. Guessing the heat pump was pulling a bunch of current and the contacts may have been loose. Loose contacts is a known problem and should be checked every year. I went out and bought an inch pound screwdriver just for that reason.

pianotuna

Regina, SK, Canada

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Posted: 02/16/21 08:58am Link  |  Quote  |  Print  |  Notify Moderator

Sounds like the internal transfer switch is "stuck". By pass the inverter/charger. Add a battery charger to the "house" bank.

If out of warranty, fix it, sell it, and buy a Victron inverter/charger.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

down home

south

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Posted: 02/16/21 09:55am Link  |  Quote  |  Print  |  Notify Moderator

...........

* This post was last edited 02/16/21 10:32am by down home *   View edit history

PastorCharlie

NC

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Posted: 02/16/21 03:18pm Link  |  Quote  |  Print  |  Notify Moderator

Why would a 2,000 watt inverter be wired into a heat pump circuit?

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