Mitsubishi MS-18RV Service Manual Page 53
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- TROUBLESHOOTING
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53
Check the conti-
nuity of indoor
and outdoor unit
connection.
Replace the indoor electronic con-
trol P.C. board.
Check of indoor electronic control P.C. board
C
The unit doesn’t operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.
Check of outdoor unit
D
Compressor and / or outdoor fan doesn’t operate.
Check the voltage to terminal block
of outdoor unit.
Is there 220-240V AC to terminal
block between 2 - N ?
Press the EMERGENCY OPERA-
TION switch.
3-minute time delay works.
Test run operation operates for 30
minutes.
Turn ON the power supply.
Check the voltage to terminal block
of indoor unit.
Is there 220-240V AC to terminal
block between 2 - N ?
No
Yes
No
Yes
Check the outdoor
wiring, the outdoor
fan motor and
compressor.
Check the both “parts side”and “pattern side” of
indoor electronic control P.C. board visually.
Replace the fuse.
Is fuse(F11) blown?
Be sure to check both fuse
and varistor in any case.
Replace the fan
motor.
Replace the
indoor electronic
control P.C. board.
Is winding
resistance of
fan motor 0 "?
Is winding
resistance of
vane motor 0 "?
No
Yes
Replace the vane
motor.
Turn OFF the
power supply.
Turn OFF the
power supply.
No
Yes
Yes
Is varistor(NR11) burnt?
Replace the varistor.
Yes
Turn OFF the power supply.
Remove indoor fan motor connector CN211 and vane
motor connector CN151 from the indoor electronic
control P.C. board and turn ON the power supply.
No
No
Does the unit operate with the remote controller?
Does the OPERATION INDICATORE lamp light up
by pressing the EMERGENCY OPERATION switch?
No
Yes
1.Pull out the power
supply cord.
2.
Measure the resistance
between CN201 1 on
the indoor electronic
control P.C. board
and
N on the terminal
block with a tester.
Is resistance approx. 0"?
Replace the fuse (F12)
CN201
2
1
N
F12
1
3
Terminal
block
Be sure to check both resistance.
Yes
No (∞)
MS-18/24RV
MS-18
/24RV
MS-30RV
MS-18RV
MS-24RV
Check the outdoor wiring, compres-
sor contactor(52C) and fuse(F) at
first, then check the outdoor fan
motor and compressor.
Check the continuity of indoor and
outdoor unit connection.
Replace the indoor elec-
tronic control P.C.board.
Check the continuity of
indoor and outdoor unit
connection.
Press EMERGENCY OPERATION
switch.
3-minute time delay works.
Test run operation operates for 30
minutes.
Turn ON the power supply.
Check the voltage to terminal block
of outdoor unit. Is there 220-240V
AC to terminal block between 2 - N ?
Check the voltage to terminal block
of outdoor unit. Is there 220-240V AC
to terminal block between 3 - N ?
Yes
No
No
Check the voltage to terminal block
of indoor unit. Is there 220-240V AC
to terminal block between 3 - N ?
Yes
No
Yes
OB271--2.qxp 2/7/01 9:04 AM Page 53
- Wireless type 1
- TECHNICAL CHANGES 2
- PART NAMES AND FUNCTIONS 3
- REMOTE CONTROLLER 4
- MS-18RV 4
- MS-24RV 4
- ACCESSORIES 4
- Indoor unit 4
- SPECIFICATION 6
- NOISE CRITERIA CURVES 8
- OUTLINES AND DIMENSIONS 10
- Unit: mm 11
- WIRING DIAGRAM 13
- INDOOR UNIT 15
- MS-30RV 15
- MODEL WIRING DIAGRAM 15
- OUTDOOR UNIT 16
- REFRIGERANT SYSTEM DIAGRAM 17
- MS-30RV 18
- MU-30RV 18
- MAX. HEIGHT DIFFERENCE 19
- PERFORMANCE CURVES 20
- 220V-240V 21
- PERFORMANCE DATA 22
- COOL operation 22
- MICROPROCESSOR CONTROL 34
- ● Fuzzy control 35
- 9-6. AUTO VANE OPERATION 39
- 18°C to 20°C 40
- About 100 41
- 9-8. EMERGENCY-TEST OPERATION 42
- MS-18RV 42
- MS-24RV 42
- PROGRAM TIMER 42
- SERVICE FUNCTIONS 45
- CN112 CN111 CN121 46
- TROUBLESHOOTING 47
- MS-18RV - MU-18RV 50
- MS-24RV - MU-24RV 50
- MS-30RV - MU-30RV 50
- Check of indoor fan motor 52
- Check of outdoor unit 53
- L-N on the 54
- How to check mis-wiring 56
- Check of outdoor thermistor 57
- Indoor coil thermistor(RT12) 58
- MU-30RV 60
- Outdoor deicer P.C. board 60
- DISASSEMBLY INSTRUCTIONS 61
- OPERATING PROCEDURE PHOTOS 62
- 12-2. MS-30RV 63
- 12-3. MU-18RV - MU-24RV 65
- OPERATING PROCEDURE 66
- 12-4. MU-30RV 67
- PARTS LIST 69
- MU-18RV 71
- MU-24RV 71
- 13-5. OUTDOOR UNIT 71
- MS-30RV - (WH) 72
- AND FUNCTIONAL PARTS 74
- OPTIONAL PARTS 76
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