Samsung MH020FVEA Service Manual page 140

Troubleshooting
G If Error code is displayed on indoor or outdoor LED, check as follows;
- Manaul address setting
Q1 Turn on the system. But outdoor units PCB displayed E201 or E101 Error code.
Step 1
Step 2
Check to communication cable indoor units.
Q2 Turn on the system. But outdoor units PCB displayed E203 Error code.
Outdoor communication error between the outdoor main
Guidance
Step 1
Q3 Turn on the indoor units. But indoor unit displayed E121/122/123/154 Error code.
Error code
Indoor unit room temperature sensor error (open/short)
E121
E122 Indoor unit heat exchanger in temperature sensor error (open/short)
Indoor unit heat exchanger out temperature sensor error (open/short)
E123
Indoor unite fan error
E154
Please, all units turn off and check to indoor unit's PCB and wire connection. E121/122/123 error detected, replace
Guicance
related sensor.
Q4 Turn on the system. But indoor unit displayed E162/163 Error code.
Error code
Indoor unit EEPROM Error.
E162
Indoor unit EEPROM Option Error.
E163
Please, all units turn off and follow guidance.
E163 : Please reset indoor Option code.
Guidance
E163 : If you don't know about that, replace indoor unit PCB which is related.
E162 : Please replace indoor unit PCB which is related.
Q5 Turn on the system. But outdoor unit displayed E221/237/251/320 Error code.
Error code
E221 Outside temperature sensor error (open/short)
Indoor unit heat exchanger in temperature sensor error (open/short)
E237
Condenser temperature sensor error (open/short)
E251
Compressor Discharge temperature sensor error (open/short)
E251
Compressor OLP sensor error (open/short)
E320
Please, The System turn off and replace sensor which is related.
Guidance
9-8
Check point
Check to Number of indoor unit's SW01.
Check to power cable to indoor units.
Check point
PCB and sub PCB.
Check to sub PCB wire and replace it.
Contents
Contents
Contents
Explanation
Contents
Explanation
Contents
Explanation
Remarks
Outdoor PCB
SW01
Wire connect
Remarks
Outdoor PCB
SW01
Wire connect
Samsung Electronics