Dometic thermostat · 1 model line
Dometic thermostat code E9
The Dometic CCC2 operating instructions list E9 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.
What code E9 means by model
| Model line | What the manufacturer says | Source |
|---|---|---|
| Dometic Comfort Control Center 2 (CCC2) | The Dometic CCC2 operating instructions list E9 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 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.
- Use normal RV power indicators to note whether shore power, generator power, or battery power is present.
Stop and call a technician for
- DIP-switch and control-board configuration work should be handled by 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.
Write this down before you call
- thermostat model
- affected zone number
- photo of LCD error code
Other codes on Dometic RV thermostats (CCC2, Single Zone LCD, Bluetooth CT)
Full table: Dometic RV thermostats (CCC2, Single Zone LCD, Bluetooth CT)
- E1 E1 as loss of communication between the Single Zone LCD thermostat and the module board; …
- 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…