Dometic Air Conditioner: “E8”
warning RV air conditioner error codes
What it means
Invalid zone configuration: the heat pump and electric heat strip DIP switches are both set ON in the same zone, which is not a valid combination. The CCC2 locks out heat pump, heat strip, air conditioning, and dehumidify in that zone.
Most likely causes
- Heat pump and heat strip DIP switches both switched ON on the power module for one zone most likely
- Incorrect DIP-switch settings after a board replacement or service common
Safe checks you can do yourself
- This is a configuration error rather than a hardware failure — note that it usually follows a recent install, board swap, or accessory change.
- Identify which zone is blinking so the correct power module's DIP switches can be corrected.
How to reset / clear E8
- Correcting the DIP-switch configuration requires accessing the rooftop/zone power module; this is normally a service step.
- After the DIP switches are set to a valid combination, cycle power off and on to clear the code.
When to call a technician
Call an RV technician to verify and correct the DIP-switch configuration, since the adjustment is inside the line-voltage power module.
Applies to
Dometic Brisk II · Dometic Penguin II · CCC2 zones equipped with both heat pump and heat strip options
FAQ
What does Dometic Air Conditioner code "E8" mean?
Invalid zone configuration: the heat pump and electric heat strip DIP switches are both set ON in the same zone, which is not a valid combination. The CCC2 locks out heat pump, heat strip, air conditioning, and dehumidify in that zone.
How do I reset Dometic Air Conditioner E8?
Correcting the DIP-switch configuration requires accessing the rooftop/zone power module; this is normally a service step. After the DIP switches are set to a valid combination, cycle power off and on to clear the code.
What is the most common cause of E8 on a Dometic Air Conditioner?
The most likely cause is heat pump and heat strip dip switches both switched on on the power module for one zone.
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The freeze sensor is reading open-circuit or out of range (d…
Sources
- Comfort Control Center 2 Thermostat User's Guide — Form No. 3314150.016, LCD Error Code section, E8 (Dometic LLC (hosted by My RV Works))
- Dometic Comfort Control Center 2 Users Guide — Error code table, E8 (thermostat.guide)
Note: E8 is a setup/configuration fault; it typically appears right after installation or service rather than during normal use.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.