Fault Code/Error Message
Description
Possible Fix
faulty.
resistance reading, see
.
Outdoor Temperature Sensor
Sensor not connected or
faulty.
Check the sensor. For
resistance reading, see
.
Air In Temp Sensor (Probe)
Sensor not connected or
faulty.
Check the sensor. For
resistance reading, see
.
Barometer
Probe not connected or
device is faulty.
Check the probe.
Humidistat
Probe not connected or
device is faulty.
Check the probe.
Door Open / No Fan Signal
Service door is open or fan
fault.
Check door or if door
switch is faulty.
Check if harness is
disconnected.
Check if fan is turning.
No Fan RPM
No rotation of the fan is
detected.
Check if the AHU door is
correctly installed. Check the
door switch. Check for power
to the unit.
Check if fan is turning or
disconnected. Check the
fuse.
A/C Freeze
Freezing detected in the
A/C coil.
The coil needs to defrost.
Refer to the manual for the air
conditioner for details on how
to prevent freezing.
Dehumidifier Freeze
Freezing detected in the
dehumidifier appliance.
The coil needs to defrost.
Refer to the manual for the
dehumidifier for details on
how to prevent freezing.
Thermostat Fault
Simultaneous heating and
cooling calls detected
Check thermostat
wiring.
Test by disconnecting
from AHU the t-stat
wires that should be
inactive.
RTOS Fault 1
Software fault
Contact IBC Technical
Support for software upgrade.
83
6.2 Warning / fault codes
Summary of Contents for AHU 800
Page 44: ...5 Set Tankless Mode to Off 6 Tap SAVE 42 Section Installation...
Page 53: ...5 Set Tankless Mode to On 6 Tap SAVE 51...
Page 55: ...5 Set Tankless Mode to On 6 Tap SAVE 53...
Page 57: ...7 Set FA Damper Open T F to lowest Fresh Air temperature 8 Tap SAVE 55...
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Page 74: ...This page is intentionally left blank...
Page 88: ...7 Air handling appliance parts diagram 86 Section Air handling appliance parts diagram...
Page 90: ...88 Section Air handling appliance parts diagram...