Page 60
MS8C / MS8H (208-230V)
Continued — 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)
Error Description System Status
Troubleshooting for Possible
Causes
Yellow Red Green
H4 6 OFF OFF
Compressor high
temperature
protection
All system functions are
terminated except indoor fan.
S Check for proper wiring connec
tions and loose wires at outdoor
control (CT1, 2) input plug.
S Check for continuity across over
load protection sensor terminals
mounted at top of compressor.
H5 4 OFF OFF
Intelligent Power
Module (IPM)
module protection
This can be caused by any of the fol
lowing:
S Loss of cooling to the heat sink
S Low voltage.
S High ambient temperature
S Loose screws fastening the outdoor
control to the heat sink
See unit information manual for further
information.
H6 OFF OFF OFF
Indoor fan not
communicating
All system functions are terminated.
Possible Indoor control failure or in
door motor failure.
S Check wiring between fan motor
and indoor control.
S Check wiring between fan motor
and terminal marked OFFAN.
S Replace one or both, if necessary.
LP 16 OFF OFF
Indoor and outdoor
unit mismatch
The two system components are
mis-matched. Refer to engineering
handbook for correct match-up. Also,
verify that the red jumper is in place
on the indoor control board.
L3 OFF 14 OFF
Outdoor DC fan
motor malfunction
S Check wiring between fan motor
and outdoor control terminal
marked OFFAN.
S If wiring is correct, replace outdoor
DC fan motor.
L9 9 OFF OFF
Power factor
protection
Indoor unit is experiencing either a
high or low input voltage condition.
S Verify proper input voltage at
terminal strip N(1) and 3.
PH 13 OFF OFF
High voltage protec
tion
All system functions are
terminated.
S Check input voltage on outdoor unit
terminal strip (N and L terminals).
S If voltage is higher than 265VAC,
disconnect power to unit. Correct
input voltage problem before reap
plying power to system.
S If voltage is below 265VAC, then
check capacitor while unit is turned
off.
S If voltage is between 200-208V, ca
pacitor is working properly
S If voltage is some other value, re
place capacitor.
S If input voltage and capacitor are
normal, replace outdoor control.
PL 12 OFF OFF
Low voltage protec
tion
All system functions are
terminated.
S Check input voltage on outdoor unit
terminal strip (N and L terminals).
S If voltage is lower than 150VAC,
restart system and check power
again.
S 9 - 12 kBtu, 208-230VAC systems
only -- Check reactor (choke) line
connection on outdoor control
terminal marked AC-L2.
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