Service manual

12-4
TROUBLESHOOTING
SM HADDCI 1-A.2 GB
15.1.3.2 Indoor unit diagnosis and corrective actions
No. Fault Probable Cause Corrective Action
1 Sensor failures of all
types
Check sensor connections or
replace sensor
2 Communication
mismatch
Indoor and Outdoor
controllers are with different
versions
Replace Indoor controller
3 No Communication Communication or grounding
wiring is not good.
Check Indoor to Outdoor wiring
and grounding
4 No Encoder Indoor electronics or motor Check motor wiring, if ok, replace
motor, if still not ok, replace
Indoor controller.
5 Outdoor Unit Fault Outdoor controller problem Switch to Outdoor diagnostics.
6 EEPROM Not
Updated
System is using ROM
parameters and not EEPROM
parameters
No action, unless special
parameters are required for unit
operation.
7 Bad EEPROM No action, unless special
parameters are required for unit
operation.
8 Bad Communication Communication quality is low
reliability
Check Indoor to Outdoor wiring
and grounding
9 Using EEPROM data No problem. System is using
EEPRRRROM parameters
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