U2" Power Supply Insufficient Or Instantaneous Failure - Daikin SkyAir RZQ200 · 250C7Y1B Service Manual

Diagnosis by Remote Controller

4.37 "U2" Power Supply Insufficient or Instantaneous Failure

U2
Remote
Controller
Display
Applicable RZQ
Models
Method of Detection of voltage of main circuit capacitor built in the inverter and power supply voltage.
Malfunction
Detection
Malfunction When the voltage aforementioned is not less than 780V or not more than 320V, or when the
current-limiting voltage does not reach 200V or more or exceeds 740V.
Decision
Conditions
Supposed
Causes
158
Power supply insufficient
Instantaneous power failure
Open phase
Defect of inverter PC board
Defect of outdoor control PC board
Main circuit wiring defect
Faulty compressor
Faulty fan motor
Faulty connection of signal cable
SiBE26-701
Troubleshooting