Fault Finding If your Dometic appliance should not operate properly, please read these pages and perform the following checks before calling for service. Troubleshooting: 3-Way Refrigerators/ Freezers Portable Compressor Refrigerators & Freezers Air Conditioners, Roof Mounted & Underbunk Truma Hot Water Systems If, after checking the above, the appliance still does not operate properly, contact your closest service agent. IMPORTANT! When reporting a problem always state: type of problem, appliance model number, product number and serial number. This information can be found on the data plate on the bottom of the appliance.