Outdoor Error Code For Mds-M Pcb - McQuay MDS Series Service Manual

6.5 Outdoor Error Code for MDS-M PCB

Error
Description
Code
R22 Wrong combination of
PCB and software
R410 Wrong combination of
PCB and software
ERSE Wrong dipswitch setting
EC00 00# - 47# indoor unit
- communication failure
EC47
6
ER48 Digital compressor
overload
ER49 Fixed compressor 1
overload
ER50 Fixed compressor 2
overload
ER51 Fix compressor 3
overload
ER52 Discharge pressure too
high
ER53 Suction pressure is too
low
Outdoor unit's IC error
ER54
70

PCB hardware is designed for R22 but software for R410A unit is installed into it.

PCB hardware is designed for R410A but software for R22 unit is installed into it.

Outdoor dipswitch setting wrong

Outdoor model dipswitch setting wrong

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

Digital compressor operating current too high, overload protector OL4 on

Fixed compressor 1 operating current too high, overload protector OL1 on

Fixed compressor 2 operating current too high, overload protector OL2 on

Fixed compressor 3 operating current too high, overload protector OL3 on

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

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

Outdoor PCB chip read faultily at the very beginning when power on

Outdoor PCB chip broken
Possible Causes Page
88
88
89
76
77
78
82
Service Manual SM-MDS_(ii)