10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
235
10
Cause of compressor stop
When the compressor stops due any of the factors below, Stop Reason Code (d1 Code) is sent to Indoor Unit.
The Code will be overridden when another Code is sent before it.
Stop reason
code
Stop factors
52C1
Process
00 Switch OFF OFF
01 Thermo OFF ON
02 Alarm OFF
03 Freeze protection ON
05 Momentary power failure detection in Outdoor unit and reset of the Outdoor PCB micro controller OFF
07
Outdoor temperature at cooling lower than -5°C for individual operation
(Outdoor temperature -15°C for simultaneous operation at annual cooling setting)
ON
Outdoor air temperature and indoor suction temperature for heating (Overload condition) ON
Stop due to outdoor heating temperature lower than -20°C (Low temperature condition) ON
10
Demand (external input) ON
Emergency stop (DSW1-4: ON or forced stop input) OFF
13 Discharge pressure increase prevention for cooling and heating ON
15
Gas shortage detection (detected by pipe temperature: gas shortage detection I) OFF
Gas shortage detection (detected by compressor-top temperature: gas shortage detection II) OFF
Compressor-top overheating (Td) ON
16 Abnormal decrease of discharge gas superheat degree (TdSH) ON
17 Inverter trip (Instantaneous overcurrent, Electronic thermal activation, Current sensor abnormality) OFF
18 Inverter trip (Inverter undervoltage, Overvoltage, Transmission error, Microcomputer reset) OFF
19 Prevention Control for expansion valve opening deviance ON
21
Thermo OFF stop due to oil return control ON
Forced Thermo OFF of simultaneous twin or greater (when other units are Thermo OFF) ON
22 Outdoor unit Heat Start Control OFF
26 Retry stop due to high pressure decrease abnormality ON
28 Cooling discharge temperature control ON
35 Refrigerating cycle abnormality (Bad or wrong switch of 4-way valve) OFF
36 Forced stop upon return from defrosting ON
39 Stop due to indoor unit rotation control ON
41 Stop due to pump down control ON
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