Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
121 Troubleshooting
3.28 “L1” Outdoor Unit: Malfunction of P.C.B.
Remote
Controller
Display
L1
Applicable
Models
RZQ18~30PVJU
Method of
Malfunction
Detection
 Detect malfunctions by current value during waveform output before compressor startup.
 Detect malfunctions by current sensor value during synchronized operation at the time of
startup.
 Detect malfunctions using an SP-PAM series capacitor overvoltage sensor.
Malfunction
Decision
Conditions
 In case of overcurrent (OCP) during waveform output
 When the current sensor malfunctions during synchronized operation
 When overvoltage occurs in SP-PAM
 In case of IGBT malfunction
Supposed
Causes
 Faulty outdoor P.C.B. (A1P)
•IPM failure
•Current sensor failure
•SP-PAM failure
•Failure of IGBT or drive circuit
Troubleshooting
YES
NO
Turn OFF the power
supply once and then turn
it ON again.
Does
it return normally?
External factor other
than malfunction (for
example, noise etc.).
Replace the outdoor
P.C.B. (A1P).
P. C . B . e quipped with a
resin case
( )
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.