Service manual

70 Service Manual SM-MDS_(i)
6.5 Outdoor Error Code for MDS-M PCB
Error
Code
Description Possible Causes Page
R22 Wrong combination of
PCB and software
• PCB hardware is designed for R22 but software for R410A unit is installed into it.
88
R410 Wrong combination of
PCB and software
• PCB hardware is designed for R410A but software for R22 unit is installed into it.
88
ERSE Wrong dipswitch setting
• Outdoor dipswitch setting wrong
• Outdoor model dipswitch setting wrong
89
EC00
-
EC47
00# - 47# indoor unit
communication failure
• Indoor 00# - 47# and outdoor communication wire broken
• Indoor 00# - 47# and outdoor communication wire loose
• Indoor 00# - 47# and outdoor communication wire A B reverse
• Indoor 00# - 47# and outdoor jump wire not correct, still on update status
• Indoor 00# - 47# and outdoor PCB program not compatible
• Indoor 00# - 47# and outdoor PCB abnormal
76
ER48 Digital compressor
overload
• Digital compressor operating current too high, overload protector OL4 on
ER49 Fixed compressor 1
overload
• Fixed compressor 1 operating current too high, overload protector OL1 on
ER50 Fixed compressor 2
overload
• Fixed compressor 2 operating current too high, overload protector OL2 on
ER51 Fix compressor 3
overload
• Fixed compressor 3 operating current too high, overload protector OL3 on
77
ER52 Discharge pressure too
high
• Outdoor motor broken (cooling)
• Outdoor circulating air short-circuit (cooling)
• Outdoor heat exchanger too dirty (cooling)
• Outdoor ball valve not open
• Indoor circulating air short-circuit (heating)
• Indoor heat exchanger too dirty (heating)
• Indoor unit filter blocked by dirt (heating)
• Indoor EXV not on properly (heating)
• Refrigerant over charged
• Outdoor PCB high pressure output port abnormal
• Pressure sensor broken
• Pressure switch broken
ER53 Suction pressure is too
low
• Outdoor ball valve not open
• Outdoor heat exchanger efficiency too low when heating
• Outdoor motor run abnormally when heating
• Refrigerant leakage or insufficient
• Outdoor PCB low pressure output port abnormal
• Low pressure sensor broken
78
ER54 Outdoor unit’s IC error
• Outdoor PCB chip read faultily at the very beginning when power on
• Outdoor PCB chip broken
82
6