Troubleshooting EH Error Code on 18k BTU Ducted Chill Cube Thermostat

An incomplete report of "EH" does not by itself identify a communication failure or a defective ADB. Record the entire display sequence, including any following digits, which display shows it and the rooftop, ADB, thermostat and controller model/part numbers. The question does not identify those exact models or revisions.

The manufacturer's code tables distinguish different controls and faults. For example, CCD-0008973, revision 10.23.25, page 14, for thermostat FACW13VSDSA-BL / 2024031600, and CCD-0009478, revision 10.21.25, page 19, for aftermarket kit 2024047199, identify E3 as loss of thermostat-to-air-conditioner communication. They do not establish that this question's EH report is E3.

The Chill Cube service manual CCD-0010546, revision 10.21.26, pages 12 and 19, distinguishes complete codes: EH60/EH61 concern indoor temperature-sensor circuits, while EH0b concerns main-PCB/display-board communication. Its model list and procedures must be matched to the installed equipment; these examples do not diagnose this installation or prove that an ADB, sensor or board needs replacement.

Give the full code sequence and equipment-label details to Lippert support or a qualified RV air-conditioning technician so they can select the applicable manual and checks. Do not disconnect control-board connectors or replace the ADB solely on the old reply. Electrical access and testing should follow the applicable manufacturer's safety and isolation instructions. No replacement, warranty approval, support response time or repair outcome is promised here.