User manual MITSUBISHI MFZ-KA35VA SERVICE MANUAL

[. . . ] FLOOR-TYPE, HEAT PUMP AIR CONDITIONERS No. OB409 SERVICE MANUAL Wireless type Models MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA - E1 E1 E1 CONTENTS 1. PART NAMES AND FUNCTIONS······················2 2. SPECIFICATION·················································4 MFZ-KA25VA - E1 3. [. . . ] A-1. Indoor fan motor (Lower) (MF2) Damper lock motor Right (ML1) Check 9-6. Measure the resistance between the terminals with a tester. (Part temperature 10°C ~ 30°C) Color of the lead wire BRN-other one Normal 235" ~ 255" Abnormal Open or short-circuit Damper lock motor Left (ML2) Measure the resistance between the terminals with a tester. (Part temperature 10°C ~ 30°C) Color of the lead wire BRN-other one Normal 235" ~ 255" Abnormal Open or short-circuit RED ROTOR YLW BRN ORN GRN Horizontal vane motor(MV1) Measure the resistance between the terminals with a tester. (Part temperature 10°C ~ 30°C) Color of the lead wire BRN-other one Normal 235" ~ 255" Abnormal Open or short-circuit Horizontal vane motor(MV2) Measure the resistance between the terminals with a tester. (Part temperature 10°C ~ 30°C) Color of the lead wire BRN-other one Normal 282" ~ 306" Abnormal Open or short-circuit 26 9-6. Troubleshooting flow When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp is not lighted. Check of indoor fan motor (upper) The indoor fan motor error has occurred, and the indoor fan doesn't operate. Turn OFF the power supply. Pay careful attention to the high voltage on the fan motor connector CN211. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch. Measure the supply voltage as follows within 12 seconds after EMERGENCY OPERATION switch is pressed. If more than 12 seconds passes by, turn OFF the power supply and turn ON it again, then measure the voltage. w 1) Measure the voltage between CN211 1(+) and 3(-). 2) Measure the voltage between CN211 5(+) and 3(-). wIf more than 12 seconds passes after EMERGENCY OPERATION switch is pressed, the voltage mentioned in above 2) goes 0V DC although the indoor electronic control P. C. board is normal. Is there anything that interferes the rotation of the line flow fan? No Yes Remove the object and adjust the line flow fan. Is there 311V DC between CN211 1 (+) and 3 (-), and does the voltage between CN211 5(+) and 3(-) rise to the range between 3 and 6V DC within 12 seconds after EMERGENCY OPERATION switch is pressed?No Yes Indoor electronic control P. C. Board Replace the indoor fan motor. Fuse (F11) JR05 JR06 VARISTOR (NR11) IC101 CN1X1 CN1Y1 R111 Replace the indoor electronic control P. C. board. C111T11 CN151 CN152 CN211 CN212 The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops. No (Changed) Replace the indoor electronic control P. C. board. Measure the voltage between CN211 6(+) and 3(-) while the fan motor is rotating. Is 0V DC or 15V DC held unchanged?Yes (Unchanged) Replace the indoor fan motor. 27 When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp flashes ON and OFF every 0. 5-second. Check of indoor fan motor (lower) The indoor fan motor error has occurred, and the indoor fan doesn't operate. Turn OFF the power supply. Pay careful attention to the high voltage on the fan motor connector CN212. [. . . ] (Refer to 1. ) (2) Remove the nozzle assembly (lower) and the drain hose. (Refer to 6. ) (3) Remove the screw of the ground wire of the indoor fan motor (lower), and then the ground wire. (See Photo 13. ) (4) Remove the screw of the motor band, and then the motor band. (See Photo 13. ) (5) Remove the line flow fan and the indoor fan motor (lower) from the box. [. . . ]