Daikin Indoor Unit Wall Mounted Type FTXS50D2V1L

Warning: Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work.

Warning: Since it may happen that refrigeration oil in the compressor will catch fire, prepare wet cloth so as to extinguish fire immediately.

Warning: Ventilate when refrigerant leaks during the work. (If refrigerant contacts fire, it will cause to arise toxic gas.)

Caution: Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas welding rod.

Disconnect the flagshaped terminals.

Detach the compressor lead wire.

Warning: Check the main circuit for short-circuit before proceeding

Main circuit checked for short-circuit?

Warning: Be careful never to touch any live parts.

Sign off on the capacitor voltage check

Conduct the followings to check the electronic expansion valve (EV).

1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and the connector number.

2. Turn the power off and back on again, and check to see if all the EVs generate latching sound.

3. If any of the EVs does not generate latching noise in the above step 2, disconnect that connector and check the conductivity using a tester.

Check the conductivity between pins 1, 3 and 6, and between pins 2, 4 and 5. If there is no conductivity between the pins, the EV coil is faulty.

4. If no EV generates latching sound in the above step 2, the outdoor unit PCB is faulty.

5. If the conductivity is confirmed in the above step 2, mount a good coil (which generated latching sound) in the EV unit that did not generate latching sound, and check to see if that EV generates latching sound.

∗If latching sound is generated, the outdoor unit PCB is faulty.

2. Check motor power supply voltage output (pins 4-7 and 4-8).

3. Check motor control voltage (pins 4-3).

4. Check rotation command voltage output (pins 4-2).

5. Check rotation pulse input (pins 4-1).

2. Check motor control voltage output (pins 2-1).;

Warning: Never touch any live parts for at least 10 minutes after turning off the circuit breaker.

Measure the power transistor's supply voltage

Is the supply voltage below 50 V?

For the UVW, make measurements at the Faston terminal on the board or the relay connector.

Measure the voltage at the Faston terminal

Measure the voltage at the relay connector

Sign off on the power transistor check