A.O. Smith Innovo 12-160 Installation, Service & Maintenance Manual page 75

Code and description
F03 (lock out error)
Air proving switch error
Switch is closed when fan
is not running.
0312266_INNOVO_UKUK_V3.0, 2017-02-10
Cause
Damaged wiring/closed circuit.
Air proving switch defect.
Measure
• Make sure that the wiring, between the
air proving switch and the control, is
connected and not damaged.
• If necessary replace the wires or
reconnect the wires. Reset the controller,
when wires are replaced or reconnected.
• Make sure that the air proving switch
works properly.
• If necessary, replace the air proving
switch.
• When the air proving switch is replaced
and reconnected, reset the controller.
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