Panasonic WU-216MF2U9 - Service Manual - Page 168

H03, H13 Alarm U-72MF2U9 / U-96MF2U9 / U-120MF2U9 / U-144MF2U9, Alarm code, H13, CT circuit failure

Get Panasonic WU-216MF2U9 PDF manuals and user guides View all Panasonic WU-216MF2U9 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 168 highlights

3. 3WAY Alarm Codes 3WAY VRF SYSTEM Trouble Diagnosis H03, H13 Alarm (U-72MF2U9 / U-96MF2U9 / U-120MF2U9 / U-144MF2U9) Alarm code H03, H13 Alarm meaning H03 : Current sensor for the 1st compressor is disconnected or shorted. H13 : Current sensor for the 2nd compressor is disconnected or shorted. Alarm conditions 1st compressor, 2nd compressor • W hen the frequency of compressor is over 35Hz and the secondary current is over 7.0A, the primary current detected lower than 0.7A. * No current is detected even though the compressors are operating. Probable cause (1) CT circuit failure (including cut wiring, etc.) (2) Disconnected CT circuit connector (3) This CT circuit is connected to the connector of the other CT circuit. (4) The Outdoor Unit Control PCB failure (5) Electrical noise Check (1) CT circuit failure, the Outdoor Unit Control PCB failure 1 Trouble: • Current value during compressor operation is below the threshold value. Check: • Check that the connector is not disconnected. • Check the continuity of the CT circuit. • Install a normal CT in place of this CT and check. If current is detected, then the Outdoor Unit Control PCB can be judged OK. → CT circuit failure • Check that current is flowing in the phase where the CT circuit is connected. 2 → Check voltage and current. (2) Crossed wiring or installation error Trouble: When the compressor is stopped, the current value at the other compressor is high. When this type of condition occurs, seizing-detection control takes priority. (3) If the cause is still unknown after checking the above, then it is possible that noise is the 3 Correction cause of the trouble. It is necessary to connect a PC or other instrument. (1) Replace the CT circuit. (2) Replace the Outdoor Unit Control PCB. (3) Correct the problem. Example (1) The connector was not inserted after the PCB was replaced. Notes Use a normal CT as a tool to determine whether the trouble is a PCB failure or CT failure. 4 H03, H13 Alarm (U-72MF2U94 / U-96MF2U94 / U-120MF2U94 / U-144MF2U94) Alarm code H03, H13 Alarm meaning H03 : Current sensor for the 1st compressor is disconnected or shorted. H13 : Current sensor for the 2nd compressor is disconnected or shorted. 5 Alarm conditions 1st compressor, 2nd compressor · When the frequency of compressor is over 35Hz and the secondary current is over 7.0A, the primary current detected lower than 0.7A. * No current is detected even though the compressors are operating. Probable cause (1) CT circuit failure (2) The Outdoor Unit HIC PCB failure (3) Power source and voltage malfunction 6 Check Check the power source and voltage. Check whether the voltage between each of the phases is correct while the compressor is running. (It is necessary to check the compressor while running because the voltage may decrease if the compressor starts running.) Correction (1) Correct the power source voltage. (2) Replace HIC PCB. 7 Example Notes - - 8 9 5 - 16

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
  • 211
5
- 16
5
3WAY VRF SYSTEM
Trouble Diagnosis
3. 3WAY Alarm Codes
H03, H13 Alarm (U-72MF2U9 / U-96MF2U9 / U-120MF2U9 / U-144MF2U9)
Alarm code
H03, H13
Alarm meaning
H03 : Current sensor for the 1st compressor is disconnected or shorted.
H13 : Current sensor for the 2nd compressor is disconnected or shorted.
Alarm conditions
1st compressor, 2nd compressor • When the frequency of compressor is over 35Hz and the secondary
current is over 7.0A, the primary current detected lower than 0.7A.
* No current is detected even though the compressors are operating.
Probable cause
(1) CT circuit failure (including cut wiring, etc.)
(2) Disconnected CT circuit connector
(3) This CT circuit is connected to the connector of the other CT circuit.
(4) The Outdoor Unit Control PCB failure
(5) Electrical noise
Check
(1) CT circuit failure, the Outdoor Unit Control PCB failure
Trouble: • Current value during compressor operation is below the threshold value.
Check:
• Check that the connector is not disconnected.
• Check the continuity of the CT circuit.
• Install a normal CT in place of this CT and check. If current is detected, then the
Outdoor Unit Control PCB can be judged OK.
→
CT circuit failure
• Check that current is flowing in the phase where the CT circuit is connected.
→
Check voltage and current.
(2) Crossed wiring or installation error
Trouble: When the compressor is stopped, the current value at the other compressor is high.
When this type of condition occurs, seizing-detection control takes priority.
(3) If the cause is still unknown after checking the above, then it is possible that noise is the
cause of the trouble. It is necessary to connect a PC or other instrument.
Correction
(1) Replace the CT circuit.
(2) Replace the Outdoor Unit Control PCB.
(3) Correct the problem.
Example
(1) The connector was not inserted after the PCB was replaced.
Notes
Use a normal CT as a tool to determine whether the trouble is a PCB failure or CT failure.
H03, H13 Alarm (U-72MF2U94 / U-96MF2U94 / U-120MF2U94 / U-144MF2U94)
Alarm code
H03, H13
Alarm meaning
H03 : Current sensor for the 1st compressor is disconnected or shorted.
H13 : Current sensor for the 2nd compressor is disconnected or shorted.
Alarm conditions
1st compressor, 2nd compressor · When the frequency of compressor is over 35Hz and the secondary
current is over 7.0A, the primary current detected lower than 0.7A.
* No current is detected even though the compressors are operating.
Probable cause
(1) CT circuit failure
(2) The Outdoor Unit HIC PCB failure
(3) Power source and voltage malfunction
Check
Check the power source and voltage.
Check whether the voltage between each of the phases is correct while the compressor is running.
(It is necessary to check the compressor while running because the voltage may decrease if the
compressor starts running.)
Correction
(1) Correct the power source voltage.
(2) Replace HIC PCB.
Example
—
Notes
—