Fault Code/Error Message Description Possible Fix
RTOS Fault 2 Software fault Contact IBC Technical
Support for software upgrade.
Table 17 Warnings and error messages shown on the air handler unit app
6.3 Measuring voltage on AHU boards
The control voltage transformer is not bonded to the AHU cabinet. When measuring the voltage
supplied to the individual control circuit, you must reference the common post of the circuit. If you
measure to ground or to another common terminal, misleading readings of approximately 14V will
occur.
To test for nominal 24V, reference the adjacent COM connection. For example, to test voltage at
Compressor S1 terminal, measure for VAC between Compressor COM and Compressor S1 and
do not reference the Thermostat COM terminal.
6.4 Pump not energized
If the pump is not energizing:
In the IBCconnect app, go to Advanced Settings, and check that Pump Enabled is set to
"on".
In the IBCconnect app, go to Basic Settings, and check that Heat Mode is not set to "Heat
Pump": During Stage 1 heat pump heating, the AHU pump is not energized by design, to
avoid interfering with circulation through the heat pump. AHU pump is energized at Stage 2
call for heat.
Check the AHU board for blown pump fuse—the only fuse rated for 10A. See Figure 32 .
6.5 Troubleshooting the IBCconnect app
6.5.1 Unstable WiFi connection
If the IBCconnect app is unable to maintain a connection to the IBC AHU WiFi, the IBCConnect
app footer will show an "X" icon above WiFi. It is likely the device is attempting to perform uploads
in the background. To prevent cell phone data and WiFi conflict:
1. Remove the IBC AHU WiFi connection from the device.
2. Go to the device’s WiFi Setting.
3. Press and hold the IBC-AHU-xxxxx entry.
4. Tap Forget Network.
5. Place the device in "Airplane Mode".
6. Reconnect the device to the IBC AHU WiFi by selecting the "IBC-AHU-xxxxx" from the list
Section: Find troubleshooting for IBC Technologies' air handling appliances.
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