Dixell iChill IC100CX series

Two-line controller for small air or water chillers and heat pumps. Codes show on the lower display, alternating with the probe reading, and most alarms switch to manual reset if they repeat too often in an hour.

What it is: Chiller and heat pump controller. The original IC100CX range. The newer IC100CX EVO uses a different alarm code list and is not covered here.

Key combo: Hold SET + DOWN for a few seconds for Pr1. Pick Pr2 and enter the service password for factory parameters.

Error codes ↓
Enter service mode ↓
Change a setting ↓

Dixell iChill IC100CX series error codes

Code	Meaning	Likely cause	How to reset
P1–P4	Probe 1 to 4 fault	Probe faulty or disconnected	Resets by itself when the reading recovers.
A01	High pressure switch alarm	High pressure input open	Automatic at first; becomes manual after the number of trips set in AL10.
A02	Low pressure switch alarm	Low pressure input open	Automatic at first; becomes manual after repeated trips within an hour.
A03	Low supply (leaving) temperature	Probe 1 below the AR03 limit for AR05 seconds	Automatic when the temperature rises above AR03 + AR04.
A04	Low air temperature leaving the evaporator	Probe 2 below AR03 for AR05 seconds	Automatic; becomes manual after Ar06 events in an hour.
A05	High condensing temperature / pressure	Probe 3 or 4 above AL11	Automatic; becomes manual after repeated events. Check condenser and fans.
A06	Low condensing temperature / pressure	Probe 3 or 4 below AL14	Automatic; becomes manual after repeated events.
A07	Anti-freeze alarm	Anti-freeze input active, or anti-freeze probe below AR03 (chiller) / AR27 (heat pump)	Automatic; becomes manual after Ar06 events in an hour.
A08	Evaporator water flow alarm	Flow switch open (ignored for AL04 after pump start)	Automatic once flow returns for AL07; manual if it stays open for AL05.
A09	Compressor 1 overload	Compressor 1 thermal protection input active	Manual reset once the cause is cleared.
A10	Compressor 2 overload	Compressor 2 thermal protection input active	Manual reset once the cause is cleared.
A11	Condenser fan overload	Fan thermal protection input active	Manual reset once the cause is cleared.
A12	Defrost ended on time	Defrost reached its maximum time (dF07)	Clears on the next good defrost, or reset manually.
A13	Compressor 1 service due	Run hours above CO14	Reset the run-hour counter in the menu.
A14	Compressor 2 service due	Run hours above CO15	Reset the run-hour counter in the menu.
A15	Water pump / supply fan service due	Run hours above CO16	Reset the run-hour counter in the menu.
A16	High evaporator inlet water temperature	Inlet reading above AL24 (ignored for AL26 after compressor start)	Automatic below AL24 − AL25; manual after repeated events.
A17	Evaporator pump / supply fan overload	Thermal protection input active	Manual reset once the cause is cleared.
A18	Condenser water pump overload	Thermal protection input active	Manual reset once the cause is cleared.
A19	Condenser water flow alarm	Condenser flow switch open (only if AL32 is not 0)	Automatic once flow returns for AL31; manual if it stays open for AL29.
A20	Condenser pump service due	Run hours above CO28	Reset the run-hour counter.
rtC	Clock needs setting	Real time clock lost its time	Set the clock, then reset the alarm.
rtF	Clock fault	Clock circuit failed	Reset manually; replace the controller if it returns.
EE	Memory error	Possible loss of stored data	Check all parameters, then reset. Replace the controller if it returns.
ACF1–ACF5	Configuration alarm	Parameters contradict each other (for example heat pump set up without a reversing valve, or two inputs given the same job)	Correct the configuration parameters.
AFr	Supply frequency alarm	Mains frequency out of range	Check the power supply.

How to enter service / parameter mode

Hold SET + DOWN for a few seconds. The upper display shows ALL, the first parameter group.
Scroll the groups with UP / DOWN and press SET to open one.
For factory (Pr2) parameters, find Pr2 in Pr1 and press SET. Pas shows with a flashing 0.
Enter the service password with UP / DOWN and press SET to confirm.

How to change and save a setting

Open Pr1 or Pr2 and select the parameter.
Press SET to show its value.
Change it with UP or DOWN.
Press SET to store it.

Other useful key presses

Task	How
View and reset active alarms	Open the menu function, scroll to ALrM and press SET. rSt means the alarm can be reset now; NO means the cause is still there.
Alarm log	Stored in the menu; holds the last 50 alarms, oldest dropped first.
Silence the buzzer	Press and release any key.

Notes

Pressure and flow alarms switch from automatic to manual reset after the number of events per hour set in their parameters. Repeated trips point to a real fault, not a nuisance.

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: Dixell iChill IC100CX quick reference guide (rel. 1.0). Always check the manual for your exact model and software version.

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