Mitsubishi Split System MUZ-GS18NA

Start COOL mode by pressing the emergency operation switch once

Start HEAT mode by pressing the emergency operation switch twice

Verify the test run operation duration

Check compressor operation frequency in COOL mode

Check compressor operation frequency in HEAT mode

Ensure indoor fan operates at High speed

Confirm test run operation finishes after 30 minutes

Verify EMERGENCY OPERATION starts after test run

Cancel test run operation by pressing the emergency operation switch or any button on remote controller

Remove the top panel, cabinet, and service panel

Disconnect the lead wire to the reactor

Disconnect the following connectors

Remove the compressor connector (CN61)

Remove the screws fixing the heat sink support and the separator

Remove the fixing screws of the terminal block support and the back panel

Remove the screw of the ground wire and screw of the terminal block support

Remove the heat sink support from the P.C. board support

Remove the top panel, cabinet, and service panel

Disconnect connectors CN931 and CN932 (Fan motor) from the inverter P.C. board

Remove the screws fixing the fan motor

Disconnect CN721 (R.V. coil) (MUZ) from the inverter P.C. board

Disconnect the lead wire to the reactor

Disconnect connectors CN671 and CN672

Pull out the discharge temperature thermistor from its holder

Pull out the defrost thermistor from its holder

Pull out the outdoor heat exchanger temperature thermistor from its holder