50
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.
Y
N
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.
Y
N
Open front desk switch to allow occupant unit operation.
Eo
Un-Configured Service Board -
All operation held awaiting configuration
Y
Y
Enter Configuration Menu and set "C3" to "C"
for coolers with electric heat or "H" for heat pumps .
EH
Emeregency Hydronic
Engaged. The EHH switch is closed.
Compressor is switched off.
Y
N
Open front emergenc y hydronic switch to allow occupant
unit operation.
LS
Load Shedding
Engaged. The LS switch is closed.
Compressor and Electric heat is switched off.
Y
N
Open load shedding 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 outs ide the range -20°F to 200°F.
F2
Wireless Remote Thermostat failure
N
N
Replace Wireless Thermostat.
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
Wireless Thermostat failure.
N
Y
Attempt to rebind Wireless Thermostat
or Replace Wireless Thermostat.
F6
Indoor Discharge Thermistor either above
or below operating tolerances.
N
Y
Replace Yellow Indoor
Discharge Thermistor.
Fb
Low Remote Battery Warning.
N
Y
Replace Batteries in Wireless Devices.
H1
High Voltage Protec tion engaged.
Power supply voltage is to high.
Y
N
Check for incoming power at correct voltage.
br
Brown Out Protection engaged.
Power was lost or voltage is low.
N
N
Check for incoming power at correct voltage.
L6
Disc harge Air Too Hot.
N
Y
Clean Filter or Remove Air Blockage.
LC
Outdoor Coil Thermistor temperature high.
N
Y
Clean Condenser Coils, Check Fan for
fault. Code will reset after cleaning.
C2
Indoor Air Recirculation. Large delta between thermostat and
return.
N
Y
Clean Filter or Remove Air Blockage or Close
Vent Door or Improve indoor to outdoor seal.
C5
Outdoor Coil temperature too high for outdoor ambient
temperature.
N
Y
Check for Blocked Outdoor Air or Clean Coil.
C3
Indoor Coil is freezing up.
N
Y
Clean filter, Check for fan and blower operation,
Check for Refrigerant loss
or Restricted capillary tube.
C4
Indoor Coil froze up.
N
Y
Clean filter, Check for fan and blower operation,
Check for Refrigerant loss
or Restricted capillary tube.
C6
Poor Unit Performance.
N
Y
Check for blower motor, compressor,
or electric heat operation.
Replace black Indoor Ambient Thermistor or
Wireless Remote Thermostat.
Y
Y
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