To Next Page

To Previous Page

5.0 Troubleshooting

This section includes a table of warning and error messages that may appear on the appliance as well

faults that may appear on the air handling appliance app.

A problem that does not prevent the operation of the air handler is declared as a "warning". A problem

that prevents the appliance from operating is declared as an "error" and the appliance is shut down.

5.1 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.

5.2 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.

5.3 Fault Codes

Fault Code/Error Message Description Possible Fix

Inlet Temperature Sensor Sensor not connected or

faulty.