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Diagnostic Codes
STATUS DISPLAY
ERROR
LIGHT
SUGGESTED ACTION
FP
Freeze Protection Engaged. The room temperature
measured by the wireless remote thermostat or indoor
ambient thermistor active sensor falls below 40°F.
YN
No Action required. This setting will disengage when
the room temperature rises above 43°F.
Fd
Front
Desk
switch is closed. All outputs are switched off.
YN
Open front desk switch to allow occupant unit
operation.
On
Control is configured to respond to a wired thermostat Y N
No action if a wired thermostat is being used.
Otherwise, see Configuration Settings.
Indoor Ambient Thermistor reads outside the range -20°F to
200°F & the wireless thermostat is not communicating to the
unit control or
Indoor Ambient Thermistor (IAT) without a wireless remote
thermostat reads outside the range -20°F to 200°F.
F2
Configuration Error N N Set C1 Configuration Code to 0 or L5.
F3
Indoor Ambient Thermistor reads outside the range -20°F to
200°F
Y N Replace black Indoor Ambient Thermistor.
F4
Indoor Coil Thermistor either above or below operating
tolerances.
N Y Replace Red Indoor Coil Thremistor .
F5
Configuration Error N Y Set C1 Configuration Code to 0 or L5.
F6
Indoor Discharge Thermistor either above or below operating
tolerances.
NY
Replace Yellow Indoor
Discharge Thermistor.
Fb
Configuration Error N Y Set C1 Configuration Code to 0 or L5.
br
Brown Out Protection engaged. Power was lost or voltage is
low.
N N Check for incoming power at correct voltage.
L6
Discharge Air Too Hot. N Y Clean Filter or Remove Air Blockage.
L8
Air Restriction in Heating. N Y Clean Filter or Evaporator Coil.
L9
Air Restriction in Cooling. N Y Clean Filter or Evaporator Coil.
LC
Outdoor Coil Thermistor temperature high. N Y
Clean Condensor Coils, Check Fan
fault code. Code will reset after cleaning.
C1
Clean Indoor Coil / Filter. N Y Check for Blocked Indoor Air.
C0
Clean Outdoor Coil. N Y Check for Blocked Outdoor Air.
CODE
M
O
D
E
S
A
I
R
F
L
O
W
W
A
R
N
I
N
G
S
Replace black Indoor Ambient Thermistor or
Wireless Remote Thermostat.
YY
F
A
I
L
U
R
E
S
F1