Carel UltraCella

All-in-one cold room controller with a large keypad, light and on/off keys, HACCP logging and add-on modules for three-phase units and electronic valves.

What it is: Cold room controller. LED and LCD keypad versions, with optional EVD EVO / EVD ice valve and 3PH power modules.

Key combo: Switch the controller off, then hold PRG for 2 s and enter the service password to reach the parameter categories.

Error codes ↓
Enter service mode ↓
Change a setting ↓

Carel UltraCella error codes

Code	Meaning	What to check
rE	Virtual control probe fault	Room / control probes and their wiring
E0–E4	Probe B1 to B5 fault	That probe, its wiring and probe-type setting
LO / HI	Low / high temperature alarm	Room temperature, alarm thresholds AL / AH and delay
IA	Immediate external alarm	Device wired to the digital input
SA	Serious external alarm	Device wired to the digital input; outputs are switched off
Pd	Pump-down took too long	Liquid solenoid, low pressure switch, pump-down time setting
LP	Low pressure alarm	Refrigerant charge, low pressure switch, evaporator icing
AtS	Autostart in pump-down	Leaking solenoid valve letting pressure rise
CHt	High condenser temperature	Dirty condenser or condenser fan fault
dor	Door open too long	Door, door switch and its delay setting
Etc	Clock fault	Real time clock
EE / EF	Memory error (unit / operating parameters)	Reload parameters; replace the controller if it returns
Ed1 / Ed2	Defrost ended on time (evaporator 1 / 2)	Heaters, defrost probe, defrost end temperature and maximum time
HA / HF	HACCP alarm (high temperature / after power cut)	Read and reset in the HACCP menu
LoG, uPL, dnL, SOF, ALM	USB download / upload / software update failed	USB stick and file; repeat the operation
SHA, LOA, MOA, LSA, Hit	EVD EVO protections: low superheat, LOP, MOP, low suction temperature, high condensing	Valve driver settings, charge, condenser
EEA	EVD EVO valve motor fault	Valve cable and motor
ES1–ES4	EVD EVO probe S1 to S4 fault or out of range	Driver probes and wiring
bAt	EVD EVO battery flat or disconnected	Ultracap / battery module
EEE, EIC, EEC, EFu, ECn, ELE	EVD EVO memory error, valve not fully closed, emergency closing, firmware mismatch, configuration error, driver offline	Driver module, its firmware and connection
EPE	3PH module offline	Connection to the three-phase module
EP0, EP1, EP2	3PH module probe fault (Sd1, Sd2, Sc)	Probes on the 3PH module
EPn	3PH module configuration fault	Module settings
EPM	3PH module motor protector	Compressor overload
EPU	3PH module high/low pressure or Kriwan trip	Pressure switches and compressor protection module
AUH / AUL	High / low humidity alarm	Humidity probe and thresholds
GH1–GH3, GH6, GL1–GL3, GA1, GA2	Generic function alarms	The generic function configured by the installer
GL6	Serious alarm from external contact (generic function)	Device on the input
IA1, IA2, IE1–IE8, IEE, ILE, IEC, IEM	EVD ice valve driver alarms (probes, MOP, LOP, low superheat, emergency closing, memory, offline, configuration, alignment)	EVD ice module and its connection

How to enter service / parameter mode

Press ON/OFF to switch the controller off.
Hold PRG for 2 seconds. PAS (or PASS on the LCD model) asks for the password.
Enter the service password with UP / DOWN and press SET.
The first category (Pro, probes) shows. Press SET to open it, or UP / DOWN to pick another.

How to change and save a setting

Scroll with UP or DOWN to the parameter.
Press SET to show its value.
Change it with UP or DOWN.
Press SET to confirm and go back to the code.
Press PRG to step back and leave. Switch the controller back on.

Other useful key presses

Task	How
Change set point	Hold SET for 2 s, adjust with UP / DOWN, press SET.

Notes

Resets differ by alarm (automatic, manual or both); we have not listed them per code because the manual's table layout is hard to read reliably. Check the alarm table in the manual.

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 UltraCella user manual (+0300083EN rel. 2.2). 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.