The Daikin PR0703(A) Reverse Phase Protector PCB Board is a protection circuit board used in Daikin VRV III outdoor units. It monitors the incoming three-phase power supply and protects the outdoor inverter system against reverse phase sequence, phase loss (open phase), and abnormal phase conditions. If an incorrect phase sequence is detected, the board prevents compressor operation to avoid damage to the inverter and compressor.

Product Specifications

Brand: Daikin
Product Type: Reverse Phase Protector PCB Board
Part Number: PR0703(A)
Application: Daikin VRV III Outdoor Unit
System Type: VRV / VRF Inverter Air Conditioner
Installation Location: Outdoor Electrical Control Box
Power Supply: 3-Phase (380–415V AC, 50Hz)
PCB Function: Phase Monitoring & Protection
Compatibility: Selected Daikin VRV III Outdoor Models (verify using the original part number before ordering)
Country of Use: Suitable for Indian Daikin VRV installations

Features

Protects against reverse phase sequence
Detects phase loss/open phase
Prevents compressor and inverter damage
Stable and reliable operation
Genuine replacement for damaged protection PCB
Industrial-grade electronic components
Easy replacement by trained HVAC technicians

Functions

Monitors incoming three-phase power continuously
Detects incorrect phase sequence
Detects missing phase and phase imbalance
Prevents outdoor unit startup during abnormal supply conditions
Improves system reliability and equipment life

Common Symptoms of Faulty PCB

Outdoor unit does not start
Reverse phase alarm
Phase protection trip
Compressor not operating
Frequent power-related shutdowns
VRV commissioning power supply errors

Product Condition

Tested before dispatch
Ready to install
Suitable for replacement and repair

Applications

Daikin VRV III Systems
Commercial Buildings
Offices
Hotels
Hospitals
Shopping Malls
IT Parks
Industrial HVAC Systems

Package Includes

• 1 × Daikin PR0703(A) Reverse Phase Protector PCB Board