McQuay MDS Series User Manual

Service Manual SM-MDS_(ii) 63
6.3 Indoor Error Code for Wired Controller MC301
Error
Code
Description
Possible Causes
Page
E0
System malfunction
 High pressure malfunction occur 3 times within 1 hour
- outdoor unit motor broken (cooling)
- outdoor circulating air short (cooling)
- outdoor heat exchanger too dirty (cooling)
- outdoor ball valve not open
- indoor circulating air short (heating)
- indoor heat exchanger too dirty (heating)
- indoor unit filter web blocked (heating)
- indoor unit EXV not turn on properly (heating)
- too much refrigerant
- outdoor unit PCB high pressure output port malfunction
- pressure sensor broken
- pressure switch broken
 Low pressure malfunction occur 3 times within 1 hour
- outdoor ball valve not open
- refrigerant leakage or shortage
- outdoor unit PCB low pressure output port malfunction
- low pressure sensor broken
 Too high discharge temperature occur once
- outdoor unit motor broken (cooling)
- outdoor circulating air short (cooling)
- outdoor heat exchanger too dirty (cooling)
- outdoor unit EXV not turn on properly (heating)
- indoor unit EXV not turn on properly
- refrigerant leakage or shortage
- outdoor ball valve not turns on
 Compressor overload protector shut and occurs 3 times
- too much current flow in the compressor
- compressor overload protector protecting value wrongly set
80
E1
TH1 open/short circuit
(discharge T.)
 Outdoor discharge temperature sensor TH1 broken or loose
73
E2
TH2 open/short circuit
(1# inlet coil)
 Outdoor 1# condenser inlet coil temperature sensor TH2 broken or loose
E3
TH3 open/short circuit
(1# midlet coil)
 Outdoor 1# condenser midlet coil temperature sensor TH3 broken or loose
E4
TH4 open/short circuit
(2# inlet coil)
 Outdoor 2# condenser inlet coil temperature sensor TH4 broken or loose
E5
TH5 open/short circuit
(2# midlet coil)
 Outdoor 2# condenser midlet coil temperature sensor TH5 broken or loose
E8
TH8 open/short circuit
(ambient T.)
 Outdoor ambient temperature sensor TH8 broken or loose
E9
TH9 open/short circuit
(outlet T.)
 Outdoor outlet coil temperature sensor TH9 broken or loose
EA
TH10 open/short circuit
(sub-cool outlet)
 Outdoor sub-cool outlet temperature sensor TH10 broken or loose
EB
TH11 open/short circuit
(sub-cool suction)
 Outdoor sub-cool suction temperature sensor TH11 broken or loose
6

McQuay MDS Series Specifications

General

Brand	McQuay
Model	MDS Series
Category	Compressor
Language	English