residential HVAC/R solutions
LG Dual Inverter AC PCB Motherboard Repair (Error CH05 / CH21 / CH61)
Specialized repair for LG Dual Inverter split AC mainboards. Fixes CH05 serial communication loss, CH21 DC peak over-current faults, CH61 condenser overheating trips, and burnt reactor coil circuits.
Dual Inverter twin-compressor driver PWM stage repair
LG Smart Diagnosis serial communication restoration
Reactor coil inductance and magnetic core integrity check
Gold-fin thermal sensor amplifier calibration
Estimated Cost
Starts from ₹1,799 + Spares
*Standard pricing applies for diagnostic audits. Exact spare parts quoted on site.
Guaranteed WorkmanshipAll spare parts are genuine OEM components backed by warranty logs.
Our Service & Commissioning Process
We follow a strict mechanical diagnosis standard to ensure zero failures.
Phase 01
Scanning fault logs via oscilloscope and LG diagnostic analyzer
Phase 02
Replacing shorted IPM power transistors and optocouplers
Phase 03
Repasting heatsink using high-thermal-conductivity compound
Phase 04
24-Hour continuous dynamic load testing before site re-installation