California Support: Diesel heater - Error code 133H

Modified on Tue, 12 Nov at 4:07 PM

If your parking heater is not working and the display shows error code E133H, it means there is a fault in the outdoor unit. To fix the issue, follow these steps:

  • Leave your camper and go to the driver's side. There, you'll find this grid:


  • Unscrew the grid from the outside of the vehicle (You may need to borrow an appropriate screwdriver from camping neighbors or the campsite. In rare cases, you may also find a screwdriver in the onboard toolkit in front of the passenger seat on the floor).
  • Behind it, you'll find a white wheel; please turn it once with your finger, then reattach the grid.


  • Go back to the display under the rear seat and clear the error by pressing the black button to activate the display and then pressing it again to confirm the error.
  • This will reset the system, and the parking heater will work again.


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