Dometic CCC 2 Thermostat / Control Box – Complete User Guide
If you own an RV or camper with a Dometic air conditioning system, chances are you’ve come across the CCC 2 Thermostat / Control Box. This advanced climate control system makes it easy to manage your RV’s temperature, fan settings, and zones with just a few taps. In this guide, we’ll cover everything you need to know about the CCC 2 thermostat—including setup, features, troubleshooting, and where to download the manual.
CCC 2 Thermostat / Control Box — Troubleshooting
Thermostat not turning on
Possible cause:
No 12V DC supply / blown fuse
Solution: Check RV fuse panel and wiring
Error “E1” on display
Possible cause:
Loss of communication with control box
Solution: Inspect cables & reset thermostat
AC not starting
Possible cause:
Low voltage / faulty control relay
Solution: Verify voltage, replace control box if needed
Heater not engaging
Possible cause:
Furnace not connected to system
Solution: Check furnace wiring & setup options
Fan runs continuously
Possible cause:
Fan set to ON instead of AUTO
Solution: Change fan setting to AUTO
Frequently Asked Questions
Why is my CCC 2 Thermostat showing “E1”? +
This error usually means the thermostat lost communication with the control box. Check the connection cable and try resetting the thermostat.
My thermostat screen won’t turn on. What should I do? +
First check the RV’s fuse panel and ensure 12V DC power is available. Replace any blown fuses and confirm wiring is properly connected.
Why is the AC not cooling even though the fan runs? +
This may indicate a low voltage issue or a faulty relay in the control box. Verify power supply and consult the manual for relay replacement steps.
How do I reset the CCC 2 Thermostat? +
Turn off the thermostat, press and hold the mode and zone buttons together, then power it back on. Follow the display prompts for reset confirmation.
Why does the fan run continuously? +
This usually happens if the fan setting is set to ON instead of AUTO. Switch it to AUTO so it only runs when heating or cooling is active.
Join The Conversation
Here you can share your thoughts or experiences about this thermostat. If you have any questions, please make sure to read the manual first. If you can’t find the manual, you can request one using our contact form.