Samsung CH070EAMC Service Manual page 104

Troubleshooting
12-2-3 Outdoor Unit
If an error occurs during the operation, it is displayed on the outdoor unit PCB.
Display
High temperature of Discharge (Protection control)
High temperature of outdoor heat exchanger (Protection control)
Low pressure of outdoor (Protection control)
Reverse phase error (Protection control)
COMP DOWN to protect being frozen
In removing frost
Error of OUT TEMP sensor (OPEN/SHORT)
Error of temperature sensor in outdoor heat exchanger (OPEN/SHORT)
Error of Discharge TEMP sensor (OPEN/SHORT)
System Down caused by communication error after
completion of tracking
Mismatching of the indoor unit numbers set with those
communicated after completion of tracking
Error of float switch in indoor unit
Error of setting option switches for optional accessories
x
OPEN/SHORT error of room sensor in indoor unit
x
OPEN/SHORT error of eva in sensor in indoor unit
x
EEPROM option error
x
Error of fan starting
Open error of electronic expansion valve in outdoor unit
(Detected once or more times)
Close error of electronic expansion valve in outdoor unit
(Detected once or more times)
Below -5°C when cooling (Outdoor temperature)
Flicker
Over 30°C when heating (Outdoor temperature)
Flicker
K1, K2, K3, K4,
K5
Flicker
The order of priority : E1  E2  E5  P0  P1 P3  P4  P5  P9  t1  t2  t3  tu  to 
- In case that the same error displays from multi-indoor units, the one having the faster address
has the priority.
12-5
Explanation
G4  G5  E3  qx  rx  vx  K1, K2, K3, K4, K5
Remark
Error about protection
control of outdoor unit
Errors about outdoor unit sensor
(OPEN/SHORT)
Detection during the
operation of indoor unit (Sensing
and sending errors into the com-
munication data)
Communication and indoor unit
errors
Self-diagnosis of indoor and
outdoor unit (x:indoor unit
address)
Displays of operating status
Samsung Electronics