Fronius CU 1800 - Other Errors

125
Error codes
(continued)
CODE CAUSE REMEDY
AL 21 DC circuit fuse of the communi-
cation connector for the
contact input/output is short
circuited.
- Ask for the service of the DC circuit fuse.
- Conrm, there is no incorrect wiring.
- Conrm there is no load of 500mA or
larger.
AL22 Cooling liquid discharge tem-
peratur sensor failure
The temperature sensor is short-circuited or
opened.
Dispose maintenance of the temperature
sensor.
AL23 Cooling liquid return temperatur
sensor failure
AL24 Compressor intake temperatur
sensor failure
AL25 Cooling liquid discharge pres-
sure sensor failure
The pressure sensor is short-circuited or
opened.
Dispose maintenance of the pressure
sensor.
AL26 Compressor discharge pres-
sure sensor failure
AL27 Compressor intake pressure
sensor failure
AL28 Maintenance of pump
Dispose maintenance of pump, fan or com-
pressor.
AL29 Maintenance of fan
AL30 Maintenance of compressor
AL32 Contact input 2 signal detection Contact input is detected.
AL33 Water leakage - Check if the leakage sensor is con-
nected.
- Leakage occurred. Check the leakage
point.
Other errors
No indication on operator panel display
Cause: The power supply switch is not switched on.
Remedy: Switch on power supply switch.
Cause: Failure of power supply switch.
Remedy: Replace power supply switch.
Cause: No power supply.
Remedy: Connect / plug in the mains cable.
Cause: Trip of breaker due to short-circuit or current leakage.
Remedy: Check for short circuit or leakage current.
Cause: Failure of [RUN/STOP] button.
Remedy: Replace the controller.
The [RUN] LED does not light
Cause: Failure of LED.
Remedy: Replace the controller.