Troubleshooting Guide
Table Of Contents
- Foreword
- Safety Notice
- CONTENTS
- Safety Notice on Maintenance
- Safety Notice on Operation
- 1. Product Introduction
- 2. Control
- 2.1 Operation Mode
- 2.2 Control Mode
- 2.3 Functions
- 2.3.1 Set Capacity Dial Code
- Set the capacity of the outdoor unit through the f
- Capacity
- 24K
- 36K
- 48K
- 60K
- Dial Codes
- 2.3.2 Set Defrost Mode
- The second digit dial code are selecting the defro
- 2.3.3 Set Operating Mode
- The third digit dial code and the fourth digit dia
- By setting the Forcible mode dial codes of the con
- Energy saving mode is achieved by setting the cond
- 2.3.4 Set Indoor Fan Speed
- Set the indoor fan speed through the four-digit di
- Capacity
- 24K indoor unit dial code
- 36K indoor unit dial code
- Level 1 (Default)
- Level 2
- Level 3
- Capacity
- 48K indoor unit dial code
- 60K indoor unit dial code
- Level 1 (Default)
- Level 2
- Level 3
- 2.3.5 Forced Defrost Control
- Press and hold "SW1" for about 5s to enter the fir
- 2.3.6 Refrigerant Recovery Control
- Press and hold "SW1" for about 5s to enter the fir
- 2.3.7 Forced Operation Control
- Press and hold "SW1" for about 5s to enter the fir
- 2.3.8 Thermostat Functions
- Thermostat model: XE70-00/E1, please refer to the
- 3.1 Wiring Diagrams
- 3.2 PCB Layout
- 3.2.2 IPM, PFC Testing Method
- 3.3 Error Code
- 3.4 Troubleshooting
- 3.4.1 “E1” Compressor High Pressure Protection
- 3.4.2 “E3” Compressor Low-pressure Protection, Ref
- 3.4.3 “E4” Compressor Air Discharge High-temperatu
- 3.4.4 “F2” Condenser Temperature Sensor Error
- 3.4.5 “F3” Outdoor Ambient Temperature Sensor Erro
- 3.4.6 “F4” Discharge Temperature Sensor Error
- 3.4.7 “F6” ODU Tube Temperature Sensor Error
- 3.4.8“EE” ODU Memory Chip Error
- 3.4.9 “H4” Overload
- 3.4.10 “H5” IPM Protection
- 3.4.11 “H6” DC Fan Error
- 3.4.12 “H7” Driver Out-of-Step Protection
- 3.4.13 “HC” PFC Protection
- 3.4.14 “Lc” Startup Failure
- 3.4.15 “P0” Driver Reset Protection
- 3.4.16 “P5” Over-Current Protection
- 3.4.17 “P6” Master Control and Driver Communicatio
- 3.4.18 “P7” Driver Module Sensor Error
- 3.4.19 “P8” Driver Module High Temperature Protec
- 3.4.20 “PA” AC Current Protection
- 3.4.21 “Pc” Driver Current Error
- 3.4.22 “PL” Bus Low-Voltage Protection
- 3.4.23 “PH” Bus High-Voltage Protection
- 3.4.24 “PU” Charge Loop Error
- 3.4.25 “ee” Drive Memory Chip Error
- 3.4.26 “e1” High Pressure Sensor Error
- 3.4.27 “C4” ODU Jumper Cap Error
- 3.5 Failures Not Caused by Errors
- 4. Maintenance
- Appendices
- 1. Resistance/Temperature Lists of Temperature Sen
- 2. Temperature/Pressure List of Refrigerant
- 3. Operation Tools
MRCOOL Universal Service Manual
114
Temperature (℃)
Resistance (kΩ)
Voltage (V)
Temperature (℃)
Resistance (kΩ)
Voltage (V)
-17
407.51
0.079
74
7.4702
1.889
-16
384.51
0.084
75
7.2245
1.916
-15
362.99
0.088
76
6.9882
1.943
-14
342.83
0.094
77
6.7608
1.969
-13
323.94
0.099
78
6.542
1.995
-12
306.23
0.104
79
6.3315
2.021
-11
289.61
0.11
80
6.1288
2.046
-10
274.02
0.116
81
5.9336
2.071
-9
259.37
0.123
82
5.7457
2.096
-8
245.61
0.129
83
5.5647
2.12
-7
232.67
0.136
84
5.3903
2.144
-6
220.5
0.143
85
5.2223
2.168
-5
209.05
0.151
86
5.0605
2.191
-4
195.97
0.158
87
4.9044
2.214
-3
188.12
0.167
88
4.7541
2.237
-2
178.65
0.175
89
4.6091
2.259
-1
169.68
0.184
90
4.4693
2.281
0
161.02
0.193
91
4.3345
2.302
1
153
0.202
92
4.2044
2.323
2
145.42
0.212
93
4.0789
2.344
3
135.96
0.223
94
3.9579
2.364
4
131.5
0.233
95
3.841
2.384
5
126.17
0.242
96
3.7283
2.404
6
119.08
0.256
97
3.6194
2.423
7
113.37
0.267
98
3.5143
2.442
8
107.96
0.28
99
3.4128
2.46
9
102.85
0.292
100
3.3147
2.478
10
98.006
0.306
101
3.22
2.496
11
93.42
0.319
102
3.1285
2.514
12
89.075
0.333
103
3.0401
2.531
13
84.956
0.348
104
2.9547
2.547
14
81.052
0.362
105
2.8721
2.564
15
77.349
0.378
106
2.7922
2.58
16
73.896
0.393
107
2.715
2.595
17
70.503
0.41
108
2.6404
2.611
18
67.338
0.427
109
2.5682
2.626
19
64.333
0.444
110
2.4983
2.64
20
61.478
0.462
111
2.4308
2.655
21
58.766
0.48
112
2.3654
2.669
22
56.189
0.499
113
2.3021
2.682
23
53.738
0.518
114
2.2409
2.696
24
51.408
0.537
115
2.1816
2.709
25
49.191
0.558
116
2.1242
2.722
26
47.082
0.578
117
2.0686
2.734