Troubleshooting
Electrical Control
249
d. Protection of pressure or temp.
e. Temperature sensor open or short circuit
Open or short circuit of
temperature sensor
Check the connections
between temperature
sensor and PCB. Are
the connections good?
Correct the connections.
No
Yes
Yes
Replace indoor or outdoor PCB.
Replace the sensor
Check the resistance value
of the sensor via Appendix 1
Is it normal?
No
Protection of pressure or temp.
Is it k1 or K2 open ?
Is temp. protective switch K1 open
Possible reason
1. The wires is loose to K1
2. Air or other gas in the refrigerant.
3. Heat exchanger is dirty
4. Outdoor fan or fan blade is
defective
5. Outdoor unit is in bad ventilation
6. Refrigerant is leakage
Is pressure protective switch K2 open
Yes
Yes
Yes
Possible reason
1. The wires is loose to K2
2. Air or other gas in the refrigerant.
3. Heat exchanger is dirty
4. Outdoor motor or fan blade is
defective
5. Outdoor unit is in bad ventilation
6. Refrigerant is too much
Summary of Contents for MUE-48CRN1-RB4
Page 1: ...Contents i 50Hz R410A ON OFF SERIES Service Manual 2017 ...
Page 2: ......
Page 4: ......
Page 8: ...Model Lists 4 General Information MUE 60CRN1 R MTB 60CWN1 R MTI 60CWN1 R ...
Page 28: ...Service Space 24 Super slim Cassette Type 3 Service Space 1000mm 1000mm 1000mm 1000m m ...
Page 30: ...Indoor Units 26 Super slim Cassette Type MCD 36HRN1 R ...
Page 31: ...Wiring Diagrams Super slim Cassette Type 27 MCD 48HRN1 R MCD 60HRN1 R ...
Page 47: ...Wiring Diagrams A5 Duct Type 43 4 Wiring Diagrams MTB 12HWN1 Q MTB 18HWN1 Q MTB 24HWN1 Q ...
Page 49: ...Wiring Diagrams A5 Duct Type 45 MTB 36CWN1 QB6 MTB 36CWN1 RB4 MTB 48CWN1 R MTB 60CWN1 R ...
Page 50: ...Wiring Diagrams 46 Duct Type MTB 48HWN1 R MTB 60HWN1 R ...
Page 58: ...Field Wiring 54 Duct Type 10 Field Wiring MTB 09CWN1 Q MTB 12CWN1 QB6 MTB 18CWN1 QB5 ...
Page 67: ...Wiring Diagrams A6 Duct Type 63 4 Wiring Diagrams MTI 18HWN1 Q MTI 24HWN1 Q ...
Page 68: ...Wiring Diagrams 64 Duct Type MTI 30HWN1 Q MTI 36HWN1 Q MTI 36HWN1 R ...
Page 69: ...Wiring Diagrams A6 Duct Type 65 MTI 60HWN1 R MTI 18CWN1 Q ...
Page 70: ...Wiring Diagrams 66 Duct Type MTI 24CWN1 Q MTI 30CWN1 Q ...
Page 71: ...Wiring Diagrams A6 Duct Type 67 MTI 36CWN1 R MTI 60CWN1 R MTI 48CWN1 R ...
Page 78: ...Field Wiring 74 Duct Type 10 Field Wiring MTI 18HWN1 Q MTI 24HWN1 Q ...
Page 80: ...Field Wiring 76 Duct Type MTI 18CWN1 Q MTI 48HWN1 R MTI 60CWN1 R ...
Page 83: ...Features High Static Pressure Duct Type 79 ...
Page 86: ...Wiring Diagrams 82 High Static Pressure Duct Type 4 Wiring Diagrams MHG 24HWN1 Q ...
Page 87: ...Wiring Diagrams High Static Pressure Duct Type 83 MHG 36HWN1 R MHG 36HWN1 Q ...
Page 88: ...Wiring Diagrams 84 High Static Pressure Duct Type ...
Page 89: ...Wiring Diagrams High Static Pressure Duct Type 85 MHG 48HWN1 R ...
Page 90: ...Wiring Diagrams 86 High Static Pressure Duct Type MHG 60HWN1 R ...
Page 96: ...Field Wiring 92 High Static Pressure Duct Type 10 Field Wiring MHG 24HWN1 Q MHG 36HWN1 R ...
Page 97: ...Field Wiring High Static Pressure Duct Type 93 MHG 36HWN1 Q MHG 48HWN1 R MHG 60HWN1 R ...
Page 101: ...Service Space Ceiling Floor Type 97 3 Service Space ...
Page 103: ...Wiring Diagram Ceiling Floor Type 99 MUE 36HRN1 R MUE 36HRN1 Q ...
Page 104: ...Wiring Diagram 100 Ceiling Floor Type MUE 48HRN1 R MUE 60HRN1 R MUE 18CRN1 QB5 ...
Page 106: ...Wiring Diagram 102 Ceiling Floor Type MUE 36CRN1 RB4 MUE 48CRN1 RB4 MUE 60CRN1 R ...
Page 111: ...Field Wiring Ceiling Floor Type 107 9 Field Wiring MUE 18CRN1 QB5 MUE 12HRN1 Q MUE 18HRN1 Q ...
Page 119: ...GA Floor standing type 115 MFGA 24CRN1 Q MFGA 48CRN1 RB4 MFGA 60CRN1 R ...
Page 126: ...Service Space 122 M Floor standing Type 12 Service Space ...
Page 127: ...Wiring Diagrams M Floor standing Type 123 13 Wiring Diagrams MFM 24ARN1 Q MFM 24CRN1 Q ...
Page 128: ...Wiring Diagrams 124 M Floor standing Type MFM 48CRN1 RB4 MFM 60CRN1 R ...
Page 136: ...Service Space 132 J2 Floor standing Type 3 Service Space ...
Page 145: ...Service Space S2 Floor standing Type 141 3 Service Space ...
Page 146: ...Wiring Diagrams 142 S2 Floor standing Type 4 Wiring Diagrams MFS2 24CRN1 QB7 MFS2 48CRN1 RB4 ...
Page 154: ...Service Space 150 S4 Floor standing Type 3 Service Space ...
Page 156: ...Wiring Diagrams 152 S4 Floor standing Type MFS4 24CRN1 QB9 ...
Page 157: ...Wiring Diagrams S4 Floor standing Type 153 MFS4 48CRN1 RB8 ...
Page 165: ...Service Space E2 Floor standing Type 161 3 Service Space ...
Page 166: ...Wiring Diagrams 162 E2 Floor standing Type 4 Wiring Diagrams MFE 60ARN1 R ...
Page 182: ...Wiring Diagrams 178 Outdoor Units MOD30U 30HN1 Q MOD31U 36HN1 Q ...
Page 183: ...Wiring Diagrams Outdoor Units 179 MOD31U 36HN1 R MOU 48HN1 R ...
Page 184: ...Wiring Diagrams 180 Outdoor Units MOE30U 60HN1 R MOUA 60HN1 R ...
Page 187: ...Wiring Diagrams Outdoor Units 183 MOD30U 36CN1 R ...
Page 188: ...Wiring Diagrams 184 Outdoor Units MOD32U 36CN1 QB6 MOD32U 36CN1 RB6 MOD30U 48CN1 RB4 ...
Page 189: ...Wiring Diagrams Outdoor Units 185 MODU 48CN1 R MODU 60CN1 R ...