Carel EVD evolution

Stepper-valve driver that controls superheat on its own or under a pCO. Alarms show as a flashing ALARM on the display board, or as LED patterns on the LED board.

What it is: Electronic expansion valve driver. Single and twin drivers, LED board or display board.

Key combo: Press PRG, then enter the service password (or the manufacturer password for every category).

Error codes ↓
Enter service mode ↓
Change a setting ↓

Carel EVD evolution error codes

Alarm	What it means	What to check
Probe S1 / S2 / S3 / S4	Probe faulty or reading outside its alarm range	Probe wiring, probe type and its alarm min / max settings
LowSH	Low superheat protection active	Low superheat threshold and timeout
LOP	Low evaporating temperature protection active	LOP threshold and timeout
MOP	High evaporating temperature protection active	MOP threshold and timeout
High Tcond	High condensing temperature protection active	Condenser, fans and the threshold
Low suction temperature	Suction temperature below threshold for the timeout	Threshold and timeout
EEPROM damaged	Unit or operating parameter memory damaged	Control stops completely. Replace the driver or contact service
EEV motor error	Valve motor fault or not connected	Valve cable and motor; switch the driver off and on
LAN error	Network communication problem	Network address and cabling; pCO powered and running
Display connection error	No communication between display and driver	Display and connectors
Adaptive control ineffective	Auto-tuning failed	Main control setting
Battery discharged	Backup battery flat, faulty or disconnected	Replace the battery if it persists after recharge time
Wrong power supply mode	DC supply with the AC power mode set	Power supply mode parameter and supply
Pressure / temperature difference	Difference between paired probes too large	Probe wiring and probe alarm settings

How to enter service / parameter mode

Press Esc until the standard screen shows.
Press PRG. A password screen appears.
Press ENTER and key in the service password digit by digit, starting from the right, confirming each with ENTER.
The first editable parameter shows. Use UP / DOWN to move through the list.

How to change and save a setting

Select the parameter with UP / DOWN.
Press ENTER to go to its value.
Change it with UP / DOWN and press ENTER to confirm.
Press Esc to leave programming.

Other useful key presses

Task	How
See the alarm queue	Press Help (or PRG while in alarm), then scroll with UP / DOWN.

Notes

All EVD evolution alarms reset by themselves once the cause clears, except where the table says to replace a part or change a setting.
Control alarms can be switched off by setting their timeout to 0. Check this if an expected alarm never appears.

For licensed technicians only. This equipment can involve mains voltage, high-voltage microwave circuits, gas and refrigerant. Isolate power (and gas) before opening panels, follow the manufacturer's manual and your local licensing rules (for example ARC refrigerant handling and electrical or gas licences). Wrong settings can spoil food or damage equipment. Check every value on the unit in front of you before changing it.

Based on: Carel EVD evolution user manual (+0300005EN rel. 3.4). Always check the manual for your exact model and software version.

ServiceModes is not affiliated with Carel or any other manufacturer. Written in our own words from the manufacturer's documentation.