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Dometic ยท 8 codes

Dometic RV thermostat fault codes (CCC2, Single Zone LCD, Bluetooth CT)

Every fault code, display message, and status light listed in Dometic's manuals for Dometic Comfort Control Center 2 (CCC2); Dometic Single Zone LCD thermostat; Dometic Bluetooth Capacitive Touch (CT) thermostat. Select a code for what it means, what you can safely check, and when to call a technician.

Confirm your model

Codes are model-specific. Match the model number on the appliance data label to one of these before using the table:

Comfort Control Center 2, CCC2, 3314080, Single Zone LCD thermostat, 3313192, 3313193, 3313194, Bluetooth CT thermostat, Capacitive Touch thermostat, 3316420.XXX

Where to look and what to record

  • Single Zone LCD thermostat model
  • air conditioner or heat pump model number
  • photo of LCD error code and mode LED
  • Bluetooth CT thermostat model number
  • photo of LCD error code, mode, and Bluetooth icon state
  • affected zone number

Code table

CodeWhat the manufacturer saysListed for
E1E1 as loss of communication between the Single Zone LCD thermostat and the module board; the LCD cycles between E1 and the previous mode setting, and the system shuts down. / E1 as: Loss of communication between the CCC2 thermostat and all or one system power module board; all-board loss shuts the system down and one-zone loss displays the affected zone.All listed models
E2An open circuit or out-of-range indoor temperature sensor; heating and cooling operation lock out while fan operation can continueAll listed models
E3A shorted indoor temperature sensor; heating and cooling operation lock out while fan operation can continue / Shorted indoor temperature sensor; heat and cool operation lock out while manual fan can continueAll listed models
E4E4 as an open circuit or out-of-range outdoor temperature sensor on select models; heat pump operation locks out while air conditioner, fan, and furnace operation can continue. / Open circuit or out-of-range outdoor temperature sensor on select models; heat-pump operation locks out while other modes may continueAll listed models
E5E5 as an open circuit or out-of-range freeze sensor; air conditioner mode locks out while furnace, heat strip, heat pump, and fan operation can continue, with the display showing the last temperature setpoint. / Open circuit or out-of-range freeze sensor; air-conditioner operation locks out while other modes may continueAll listed models
E7Loss of normal AC power to all system power module boards; the system shuts downDometic Comfort Control Center 2 (CCC2)
E8Invalid zone configuration with heat pump and heat strip DIP switches both on in one zone; affected-zone operation locks outDometic Comfort Control Center 2 (CCC2)
E9E9 as: Invalid zone configuration with dehumidifier DIP switch and heat pump or heat strip DIP switch on in one zone; affected-zone operation locks out.Dometic Comfort Control Center 2 (CCC2)

Do not open thermostat, rooftop HVAC, or electrical compartments, and do not bypass communication or sensor circuits. Shut the affected HVAC system off and arrange qualified RV HVAC service for unresolved Single Zone LCD faults.

Do not remove thermostat, rooftop HVAC, or electrical compartment covers, and do not bypass communication or sensor circuits. Shut the affected HVAC system off from normal controls and arrange authorized Dometic service or qualified RV HVAC service for unresolved Bluetooth CT faults.

Do not bypass thermostat wiring, rooftop equipment controls, module boards, DIP switches, 120 VAC circuits, or freeze/sensor safeties. Shut off the affected HVAC equipment and arrange qualified RV HVAC service for unresolved faults.

Troubleshooting guides

Official manuals and support pages

DometicDometic Single Zone LCD Thermostat Operating InstructionsDometicDometic 3316420.XXX Bluetooth CT Thermostat Operating InstructionsDometicDometic Comfort Control Center 2 Thermostat Operating Instructions