Page 59
Corp. 1244-L9
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
E5
5
OFF
OFF
Compressor
over-current
protection
All system functions are
terminated except indoor fan.
S
Check for locked compressor rotor
due to excessively high ambient
temperature.
S
Check for restricted refrigerant flow
due to blocked capillary tubing.
S
Check outdoor unit to make sure
that coil is not blocked.
E6
OFF
OFF
OFF
Communication
failure between
indoor unit and
outdoor unit
All system functions are
terminated after three-minute
delay except indoor fan.
S
If error is displayed on outdoor unit,
check communications cable / wire
at indoor and outdoor controls to
verify proper connection. See unit
information manual for further
information.
FH
OFF
4
OFF
Anti-freezing upper
and lower limit
range
Compressor will run at reduced
speed until temperature increases.
S
Wait for temperature to increase
above 42.8ºF (6ºC), then recheck
operation status.
F0
OFF
OFF
OFF
Indoor coil is
gathering refrigerant
All system functions are
terminated except indoor fan.
S
Pump refrigerant into outdoor unit.
Check 2-way shut-off valve in small
line to see if it is closed or if flow is
restricted. Correct, if necessary.
F1
OFF
OFF
OFF
Indoor ambient
sensor (RT1) open
or short circuited
Cooling and dehumidification
modes will continue to operate as
well as indoor fan. Unit will not
operate in heating mode.
S
Check sensor to ensure that it is in
acceptable range.
S
Check sensor for proper resistance.
S
Replace sensor if shorted, open or
out-of-calibration.
F2
OFF
OFF
OFF
Indoor coil sensor
(RT2) open or short
circuited
F3
OFF
6
OFF
Outdoor ambient
sensor (RT4) open
or short circuit
All system functions are
terminated except indoor fan.
S
Check sensor to ensure that it is in
acceptable range.
S
Check sensor for proper resistance.
S
Replace sensor if shorted, open or
out-of-calibration.
F4
OFF
4
OFF
Outdoor coil sensor
(RT3) open or short
circuit
F5
OFF
7
OFF
Discharge line
sensor (RT5) error
All system functions will continue
to run for 3 minutes, then
terminate. Indoor fan will continue
to run.
S
Check sensor for proper resistance.
Sensor should be in acceptable
range. Replace sensor if shorted,
open or out-of-calibration.
F6
OFF
3
OFF
Compressor over
load limit issue
Normal operational state with
compressor speed automatically
adjust for operational conditions.
System will continue to operation
at reduced compressor speed until
issue is corrected.
S
Check outdoor ambient air
temperature. Could be too high.
S
Check for locked compressor rotor.
S
Check for blocked refrigeration
circuit (capillary tubes for example).
S
Check for blocked or restricted
outdoor air flow. Clear, if necessary.
S
Check for low refrigerant charge.
F8
OFF
1
OFF
High current limit
issue
System will continue to operate at
reduce compressor speed until
issue is corrected.
S
Check for low or high input voltage.
Correct if necessary. Could be too
high.
F9
OFF
2
OFF
Discharge line
temperature too
high
S
Check discharge line temperature.
Correct if to high.
HC
14
OFF
OFF
Power factor
correction
protection
System will continue to operate at
reduce compressor speed until
issue is corrected.
See unit information manual for fur
ther information.
H1
2
OFF
OFF
Defrosting (heat
pump only)
Normal operation
Normal defrost operation.
H3
8
OFF
OFF
Compressor
overload protection
sensor (CT1,2)
malfunction.
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.
