Electra WNG 50 DCI Service Manual page 93

14.3.4 Indoor unit diagnostics and corrective actions
No. Fault
1-4 Sensor failures
Communication
7
mismatch
8 No Communication
9 No Encoder
11 Outdoor Unit Fault
17-21 Protections
24 EEPROM Not Updated
25 Bad EEPROM
26 Bad Communication
27 Using EEPROM data
28-31 IDU model
14.4 Procedures for checking Main Parts
14.4.1 Checking Mains Voltage
Confirm 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).
14.4.2 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.
14.4.3 Checking PFC Chock coil
Check PFC chock connection – repair if needed.
Dis-connect the chock from the controller wire extensions, check if the 2 wires of the chock
are shorted. If shorted (OK) check between each wire and the metal box. If shorted replace
chock, if not (OK), open the controller top cover and check if the wire extensions are
connected well and if shorted. If not shorted, replace wires, if shorted (OK) than might be a
controller problem – replace controller.
Service Manual - WNG 50_60_80 DCI
Probable Cause
Sensors not connected or
damaged
Indoor and Outdoor controllers
are with different versions
Communication or grounding
wiring is not good
Indoor electronics or motor
Outdoor controller problem
Indication
System is using ROM parameters
and not EEPROM parameters
Communication quality is low
reliability
No problem
Revision Y05-02
CONTENT
TROUBLESHOOTING
Corrective Action
Check sensor connections or
replace sensor
Replace Indoor controller
Check Indoor to Outdoor wiring
and grounding
Check motor wiring, if ok,
replace motor, if still not ok,
replace Indoor controller.
Switch to Outdoor diagnostics.
No action
No action, unless special
parameters are required for unit
operation.
No action, unless special
parameters are required for unit
operation.
Check Indoor to Outdoor wiring
and grounding
14-7