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Table 16: Diagnostic codes
Code
Freeze Protection Engaged. The room temperature
FP
measured by the wireless remote thermostat or indoor ambi-
ent thermistor active sensor falls below 40°F.
Front Desk switch is closed. All outputs are switched off.
Fd
Un-Configured Service Board -
Eo
All operation held awaiting configuration
Emergency Hydronic Engaged. The EHH switch is closed.
EH
Compressor is switched off.
Load Shedding Engaged. The LS switch is closed.
LS
Compressor and Electric heat is switched off.
Control is configured to respond to a wired thermostat
On
Open Door Lockout (DS1 & DS2 open; wireless)
oP
Window Switch Lockout - (LS & INN open)
nP
Heat Sentinel - (WIAT > u3)
hP
Un-Rented Status (EHH & INN or wireless)
Ur
Indoor Ambient Thermistor reads outside the range -20°F to
200°F & the wireless thermostat is not communicating to the
unit control or
F1
Indoor Ambient Thermistor (IAT) without a wireless remote
thermostat reads outside the range -20°F to 200°F.
F2
Wireless Remote Thermostat failure
Indoor Ambient Thermistor reads outside the range -20°F to
F3
200°F
Indoor Coil Thermistor either above or below operating toler-
F4
ances.
F5
Wireless Thermostat failure
Indoor Discharge Thermistor either above
F6
or below operating tolerances.
Low Remote Battery Warning.
Fb
High Voltage Protection engaged.
H1
Power supply voltage is to high.
Brown Out Protection engaged.
br
Power was lost or voltage is low.
Discharge Air Too Hot.
L6
Outdoor Coil Thermistor temperature high.
LC
Indoor Air Recirculation. Large delta between thermostat and
C2
return.
Outdoor Coil temperature too high for outdoor ambient
C5
temperature.
Indoor Coil is freezing up.
C1
Indoor Coil is freezing up.
C3
Indoor Coil froze up.
C4
Poor Unit Performance.
C6
Indoor Freezing Lockout (ICT - IAT > 20) +10 Min.
C7
Status
Error
Display
Light
No Action required. This setting will disengage when the
Y
N
room temperature rises above 43°F.
Open front desk switch to allow occupant unit operation.
Y
N
Enter Configuration Menu and set "C3" to "C"
Y
Y
for coolers with electric heat or "H" for heat pumps.
Open front emergency hydronic switch to allow occupant
Y
N
unit operation.
Open load shedding switch to allow occupant unit
Y
N
operation.
No action if a wired thermostat is being used.
Y
N
Otherwise, see Configuration Settings.
Close Room Door.
Y
Y
Unit will not condition space with door open.
Close Room Door or Window.
Y
Y
Unit will not condition space with door or window open.
No action required. This setting will disengage when the
Y
N
room temperature falls.
Front Desk needs to set to Rented mode (if applicable).
Y
N
Replace black Indoor Ambient Thermistor or Wireless
Y
Y
Remote Thermostat.
Replace Wireless Thermostat.
N
N
Replace black Indoor Ambient Thermistor.
Y
N
Replace Red Indoor Coil Thermistor.
N
Y
Attempt to rebind Wireless Thermostat or Replace Wireless
N
Y
Thermostat.
Replace Yellow Indoor Discharge Thermistor.
N
Y
Replace Batteries in Wireless Devices.
N
Y
Check for incoming power at correct voltage.
Y
N
Check for incoming power at correct voltage.
N
N
Clean Filter or Remove Air Blockage.
N
Y
Clean Condenser Coils, Check Fan for fault. Code will reset
N
Y
after cleaning.
Clean Filter or Remove Air Blockage or Close Vent Door or
N
Y
Improve indoor to outdoor seal.
Check for Blocked Outdoor Air or Clean Coil.
N
Y
Clean filter, Check for fan and blower operation,
N
Y
Check for Refrigerant loss or Restricted capillary tube.
Clean filter, Check for fan and blower operation,
N
Y
Check for Refrigerant loss or Restricted capillary tube.
Clean filter, Check for fan and blower operation,
N
Y
Check for Refrigerant loss or Restricted capillary tube.
Check for blower motor, compressor, or electric heat
N
Y
operation.
Clean filter, Check for fan and blower operation,
N
Y
Check for Refrigerant loss or Restricted capillary tube.
Suggested Action
IM 1193 / Page 23 of 32
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