Product data

12—TROUBLESHOOTING
SM YAZE218 1-A.2 GB | 12—8
12.3.5 Indoor unit diagnostics and corrective actions
No. Fault Probable Cause Corrective Action
1-4 Sensor failures
Sensors not connected or
damaged
Check sensor connections or
replace sensor
7
Communication
mismatch
Indoor and Outdoor controllers are
with different versions
Replace Indoor controller
8 No Communication
Communication or grounding
wiring is not good
Check Indoor to Outdoor wiring
and grounding
9 No Encoder Indoor electronics or motor
Check motor wiring, if ok, replace
motor, if still not ok, replace
Indoor controller.
11 Outdoor Unit Fault Outdoor controller problem Switch to Outdoor diagnostics.
noitca oNnoitacidnIsnoitcetorP12-71
24 EEPROM Not Updated
System is using ROM parameters
and not EEPROM parame
ters
No action, unless special
parameters are required for unit
operation.
25 Bad EEPROM
No action, unless special
parameters are required for unit
operation.
26 Bad Communication
Communication quality is low
reliability
Check Indoor to Outdoor wiring
and grounding
27 Using EEPROM data No problem
28-31 IDU model Indication : DCI-25,35,50,60
12.4 Procedures for checking Main Parts
12.4.1 Checking Mains Voltage
Con rm that the Mains voltage is between 198 and 264 VAC. If Mains voltage is out of this range,
abnormal operation of the system is expected. If in range check the Power (Circuit) Breaker and
look for broken or loosed cable lugs or wiring mistake(s).
12.4.2 Checking Main fuse
Check 20A fuse on the Filter Board - If burnt – check the compressor, fan or any other peripheral
that can cause a short. In case of a problematic peripheral - replace it.
In case no problematic peripheral, check the resistance on the DC bank (B+ & B- on the Power
board), if it is less than 30Ω, replace the controller. Otherwise replace the burnt fuse.
In case of frequent burning fuse, replace the controller.
12.4.3 Checking the Compressor
Check Compressor connections - Repair if needed.
Use a current probe (“Clamp”) to assure that there is an AC current on each phase – no more
than 15A.
In case there is no current, check the resistance between the three poles. Assure the three coil
resistances are almost the same (between 0.8Ω to 1.5Ω)
.
Change to Stand-by or Power OFF and re-start - If the fault is still “Active” - replace controller.