OM 1263 • MICROTECH UNIT CONTROLLER 92 www.DaikinApplied.com
ERROR CODE: P1 – Inverter Over-Ripple Protection
Remote
Controller
Display
P1
Method of
Malfunction
Detection
Imbalance in supply voltage is detected in PC board.
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
Condition
“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 PC board
● Defect of K2 relay in inverter PC board
● Improper main circuit wiring
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