When not on shore power or generator, I turn on the Xantrex 1800 XM PRO Inverter to run the residential refrigerator. When I turn the inverter on, I get an E05 OL error code. I have turned off the main breaker (again with no shore power or generator) and I still get the E05 OL code. What do I do next? Thanks. —Bill, 2015 Thor Miramar
We just worked on a 2015 Thor Challenger that had shot batteries and a Xantrex 1800 XM Pro Inverter that did not work along with a punch list of other items. I kept a copy of the Service Manual and according to it, the E05 OL code is an overload situation. Here is the description from the manual.
Unfortunately, the manual does not have a recommended fix for this situation, so I dug a little deeper and contacted the tech support at Xantrex.
The inverter operates on two modes: Shore Power Mode and Inverter Mode.
Shore Power Mode
When you are connected to shore power such as a campground source, or running the generator, the inverter goes into a standby phase and allows the power to pass through the unit. On the front you will see the knockouts for routing Romex or 120-volt wiring in and out of the unit. If the inverter is on, the green light will illuminate. However, you do not need the unit to be turned on as power should pass through even if it is off.
When the shoreline power drops below 90 Vac or is disconnected, the transfer switch automatically transfers power to the outlets from battery power and the yellow light is illuminated. The inverter does need to be on for this to work.
The 2015 Thor we worked on had no LED reading on the remote and we had no power. So we verified there was 12-volt power coming from the battery to the red (positive) and black (negative) posts on the inverter, and there was. This was after we had replaced the batteries with new lithium batteries and a Progressive Dynamics converter. And yes, we had sufficient power coming in.
Talking with the technician, he indicated the pass-through breaker could have tripped. He walked us through the reset procedure. Make sure the unit is not plugged into 120-volt ac power or the generator is not running. Then unhook the negative cable to the inverter for a few minutes and then it should reset. We let ours sit for 30 minutes, as he indicated all the capacitors need to drain power.
The tech indicated they would like manufacturers to install a subpanel with a 15A breaker or fuse on the AC power line coming into the inverter to help protect from power surges from the campground source or generators. This seems to be a big issue on the forums as most RV manufacturers simply hard wire the unit, as ours was. He did indicate using a surge protector like the Surge Guard model would help. Our owner did not have one of these, so that might be a good idea.
I’m not sure why a pass-through breaker tripping would affect the 12-volt or inverter side, but it seems to be common.
If you try this reset and it does not work, chances are you will need to send the unit in to have the pass-through breaker reset. Xantrex has a very good tech support department.
Dave Solberg is a leading expert in the RV industry and author of the “RV Handbook” as well as the Managing Editor of the RV Repair Club.
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