Dometic thermostat · 3 model lines
Dometic thermostat code E1
E1 appears for 3 model lines. The Dometic Single Zone LCD thermostat manual lists E1 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.
Check your model first. The same code can mean different things on different models. Find the model number on the appliance's data label, then use the matching row below.
What code E1 means by model
| Model line | What the manufacturer says | Source |
|---|---|---|
| Dometic Comfort Control Center 2 (CCC2) | The Dometic CCC2 operating instructions list 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. | Dometic Comfort Control Center 2 Thermostat Operating Instructions |
| Dometic Single Zone LCD thermostat | The Dometic Single Zone LCD thermostat manual lists E1 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. | Dometic Single Zone LCD Thermostat Operating Instructions |
| Dometic Bluetooth Capacitive Touch (CT) thermostat | The Dometic Bluetooth CT thermostat manual lists E1 as loss of communication between the CT thermostat and module board; the LCD cycles between E1 and the previous mode setting, and the system shuts down. | Dometic 3316420.XXX Bluetooth CT Thermostat Operating Instructions |
What you can safely check
- Record the affected zone number and displayed code.
- Turn the affected HVAC equipment off if it is not operating normally.
- Note whether normal RV shore power, generator power, or battery power is present from installed indicators.
- Record the displayed code, previous mode, setpoint, fan setting, and Bluetooth icon state.
- Turn the thermostat off from the normal On/Off Mode button if the HVAC equipment is not responding.
- Note whether normal RV shore, generator, or battery indicators show available power before arranging service.
Stop and call a technician for
- CCC2 communication, module-board, and zone wiring diagnosis should be handled by qualified RV HVAC service.
- Single Zone thermostat communication and module-board diagnosis should be handled by qualified RV HVAC service.
- CT thermostat communication and module-board diagnosis should be handled by authorized Dometic service or qualified RV HVAC service.
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.
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.
Write this down before you call
- Single Zone LCD thermostat model
- affected zone number
- photo of LCD error code and mode LED
- air conditioner or heat pump model number
- Bluetooth CT thermostat model number
- photo of LCD error code, mode, and Bluetooth icon state
Other codes on Dometic RV thermostats (CCC2, Single Zone LCD, Bluetooth CT)
Full table: Dometic RV thermostats (CCC2, Single Zone LCD, Bluetooth CT)
- E2 An open circuit or out-of-range indoor temperature sensor; heating and cooling operation …
- E3 A shorted indoor temperature sensor; heating and cooling operation lock out while fan ope…
- E4 E4 as an open circuit or out-of-range outdoor temperature sensor on select models; heat p…
- E5 E5 as an open circuit or out-of-range freeze sensor; air conditioner mode locks out while…
- E7 Loss of normal AC power to all system power module boards; the system shuts down
- E8 Invalid zone configuration with heat pump and heat strip DIP switches both on in one zone…
- E9 E9 as: Invalid zone configuration with dehumidifier DIP switch and heat pump or heat stri…
Related troubleshooting guides
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