Electra LEX 25 DCI Service Manual page 100

13.2.4.1 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
EEPROM Not
24
Updated
25 Bad EEPROM
26 Bad Communication
27 Using EEPROM data
28-31 IDU model
13.2.5 Procedures for checking Main Parts
13.2.5.1 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).
13.2.5.2 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.
13.2.5.3 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.
SM LEXDCI 1-E.1 GB
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
CONTENTS
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
13-17