Daikin REYQ8-48PY1B, Service Manual

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Troubleshooting by Indication on the Remote Controller SiBE37-701_B
333 Troubleshooting
3.44
“
P1
”
Outdoor Unit: Inverter Over-Ripple Protection
Remote
Controller
Display
P1
Applicable
Models REYQ8P~48P
Method of
Malfunction
Detection Imbalance in supply voltage is detected in PCB.
Imbalance in the power supply voltage causes increased ripple of voltage of the main circuit
capacitor in the inverter. Consequently, the increased ripple is detected.
Malfunction
Decision
Conditions When the resistance value of thermistor becomes a value equivalent to open or short circuited
status.
★
Malfunction is not decided while the unit operation is continued.
"
P1
" will be displayed by pressing the inspection button.
When the amplitude of the ripple exceeding a certain value is detected for consecutive 4
minutes.
Supposed
Causes
„
Open phase
„
Voltage imbalance between phases
„
Defect of main circuit capacitor
„
Defect of inverter PCB
„
Defect of K2 relay in inverter PCB
„
Improper main circuit wiring