Service manual

16-6
TROUBLESHOOTING > GC 24
SM HADDCI 1-A.2 GB
No Fault Name Probable Cause Corrective Action
18 No communication A No signals in line A Check communication
19
Compressor- Ilegal
Speed
Exceeds speed low limit See # 13
20 System Configuration
Changed
Communication lines changed
from last operation
No problem just an
announcement
21 System Configuration
Problem
Miss-match between the IDUs
connected to port A,B,C or D, or
the total capacity code of IDUs is
higher than the ODU maximum
capacity code
Change configuration if needed.
22 Heat sink Over
Heating Fault/
Protection
Compressor stopped due to
heatsink protection
Check that the airflow around
the ODU is free and the fan is
running free. Check fan motor
(0)
23 Deicing Protection During deicing procedure No action required
24 Compressor Over
Heating Protection
Compressor stopped due to over
heat protection
Check if gas is missing in the
system
25 System over power
Protection
Compressor stopped due to over
power protection
No action required
26 Bad EEPROM EEPROM not operating Power reset. (Replace
Controller just in case you need
EEPROM).
27 Not Configured Cannot start the control Power reset. Replace Controller
if didn’t help
28 Bad Communication Bad communication lines See # 18-21
16.3.3 Fault Code for Indoor unit
Pressing Mode button for long will activate diagnostic mode by the acknowledgment of 3 short beeps
and lighting of COOL and HEAT LED’s.
Entering diagnostics in STBY mode allows only viewing of status (fault-display).
In diagnostic mode, system problems / information will be indicated by blinking of Heat & Cool
LED’s.
The coding method will be as follows:
Heat led will blink 5 times in 5 seconds, and then will be shut off for the next 5 seconds. Cool Led will
blink during the same 5 seconds according to the following table
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