Page 58
MS8C / MS8H (208-230V)
Table 18. 09 through 12 and 30 kBtu System Status and Error Codes — Indoor Character Display and Outdoor
LEDs
Indoor
Character
Display
Outdoor LED Displays
(number of blinks)
Description System Status
Yellow Red Green
SYSTEM STATUS LEDs
NONE BLINKING
Indoor and outdoor
units are
communicating
System is operating normally. The blinking interval is 1 second on, 1
second off.
NONE
BLINK
ING
Compressor is
running
System is operating normally. The blinking interval is 1 second on, 1
second off.
NONE 8
System has a
heating or cooling
demand
System is operating normally. The blinking interval is 1 second on, 1
second off and up to three second pause between repeating blinks.
SYSTEM ERROR DISPLAY AND LEDs
Indoor
Character
Display
Outdoor LED Displays
(number of blinks)
Error Description System Status
Troubleshooting for Possible
Causes
Yellow Red Green
NONE 1 OFF OFF
Compressor has an
open circuit.
All system functions are
terminated except indoor fan.
S Check connections between com
pressor and outdoor control (con
trol terminals are marked U, V
and W).
NONE OFF 11 OFF
Frequency limiting
module temperature
All system functions are
terminated except indoor fan.
S Verify proper attachment of heat
sink.
S Clean heat sink, if necessary.
NONE OFF 13 OFF Power issue
Compressor speed automatically
adjusted to match conditions.
System power issue.
C5 OFF OFF OFF
Indoor control
jumper is missing
(labeled JUMP)
All system functions are
terminated.
S Check indoor control jumper con
nections and replace jumper, if
missing.
EE 11 OFF OFF EEPROM failure S Replace outdoor control.
E2 3 OFF OFF
Indoor coil freeze
protection
All system functions are
terminated except indoor fan. The
indoor coil sensor (RT2) monitors
the coil temperature continuously.
If coil temperature drops below
30.2ºF (-1ºC), the compressor and
the outdoor fan (30 seconds later)
are switched off. Condition is
cleared when indoor coil
temperature rises above 42.8ºF
(6ºC) and the compressor has
been off for a minimum of three
minutes.
S Check for restricted indoor airflow
and change filter, if necessary.
S Check for restricted refrigerant
flow.
S Check for low outdoor ambient
temperature or low indoor system
load.
E3 OFF 9 OFF
Outdoor coil
blockage or low
refrigerant due to
leak.
All system functions are
terminated except indoor fan.
S Check for proper clearances
around outdoor unit.
S Check outdoor coil for and clean,
if necessary.
E4 7 OFF OFF
Discharge line
temperature
protection
Sensor RT5 monitors compressor
discharge line temperature and
communicates with outdoor unit
microprocessor. Depending on the
temperature measured, the
compressor speed will be
increased to meet the load or will
continue to run at the existing
speed. If the temperature becomes
excessively high, the compressor
will be de-energized. When the
compressor discharge temperature
drops below 194ºF (90ºC), the unit
will resume normal operation. See
unit information manual for further
information.
S Check for low refrigerant charge.
S Check for restricted refrigerant
flow due to blocked capillary.
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