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Diagnostic Codes - Fujitsu ASU9CQ Operating Manual

Heat&coqling model (reverse cycle) room air conditioner wall mounted
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Table of Contents
DIAGNOSTIC CODES
ERROR
CODE
SUGGESTED ACTION
STATUS
DISPLAY
UGHT
Freeze Protection Engaged. The room temperature
No Action required. This setting will disengage when the
FP
measured by the wireless remote thermostat or indoor ambient
Y
N
room temperature rises above 43'F.
thermistor active sensor falls beiON 40'1".
Fd
Eo
EH
Y
N
Compressorisswlched off.
Front Desk swlch is closed. All ootputs are swlched off.
Y
N
Open front desk swKch to anow
Un-Configured Service Board.
Y
Y
Enter Configuration Menu
All operation held awaiting configuration
for coolers wlh elec!ric heat
Emeregency Hydronlc Engaged. The EHH switch is closed.
Open front emergency hydronic switch to allow
unit operation.
Load Shedding Engaged. The LS swlch
is
closed.
Open load shedding
switch
LS
N
Compressor and 8ec!ric heat is switched
off.
to allow occupant unit operation.
No action ifa wired thermostat is being used.
On
Control is configured to respond to a wired thermostat
Y
N
Otherwise, see Configuration Setlilgs.
Indoor Ambien! Thermistor reads outside the
range -20'F to 200"F
&
the wireless thermostat is not
F1
communi::ating to the unit control or
Y
Y
Replace black Indoor Ambient Thermistor or
Wireless Remote Thermostat.
Indoor Am bie rt Thermistor (IAT) wlhouta wi-eless remote
thermostat reads ootskle the range -2Q'F to 2QO'F.
F2
Wireless Rem ate Thermostat failure
N
N
Replace Wireless Thermostat
Indoor Am bien! Thermistor reads
F3
Y
N
Replace black Indoor Ambient T
outside the range ·20"F to 200'F
IndoorCoi Thermistor either above
F4
N
Y
Replace Red Indoor Coil Thermistor •
or below operating tolerames.
Attempt to rebind Wreless Thermostat
F5
Wireless Thermostat faiure.
Y
or Replace Wireless Thermostat
Indoor Discharge Thermistor elher above
Replace Yelow Indoor
F6
N
Y
or below operating tolerances.
Discharge Thermistor.
Fb
LON Remote Battery Waming.
N
Y
Replace Batteries in Wireless Devices.
High Voltage Protection engaged.
H1
Y
N
Check for incoming power at correct voltage.
Power supply voltage is to high.
Brown Out Protection engaged.
br
N
N
Check for imoming power at correct voltage.
Powe r was lost or voltage is low.
L6
Discharge Air Too Hot.
N
Y
Clean Filter or Remove Air Blockage.
Clean Condenser Coils, Check Fan for
LC
Outdoor Coil Thermistor temperature high.
N
Y
fault Code will reset after cleaning.
Indoor Air Recirculation. Large delta between thermostat and
Oean F iter or Remo\e Air Blockage or Close
C2
N
Y
return.
Vent Door or Improve indeorto outdoor seal
Outdoor Coil temperature too high for outdoor ambient
C5
N
Y
Check for Blocked Outdoor Air or Oean C
temperature.
Oean ruter, Check for fan and blower operation,
C3
Indoor CoH is freezing up.
N
Y
Check for Refrigerant loss
or Restricted capiiary tube.
Clean filter, Check for fan and blower operation,
C4
Indoor Coi froze up.
N
Y
Check for Refrigerant loss
or Restricted capillary tUbe.
Check for blower motor, compressor,
C6
Poor Unit Performance.
N
Y
or electric heat operation.
17

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