Armstrong World Industries EHU-703 - Manual (Page 16)

15) Verify that all of the input/output circuits are functioning properly by entering the input/output
diagnostics mode. Press the mode button until the diagnostics indicator lights and wait ten
seconds. The unit will do a complete self-diagnostic check. See CO in the diagnostics section of
this manual (page 20) for more information.
16) Turn power off, if humidification is not needed.
17) Close and lock the doors, and store the key away from the unit.
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