Airbus A320 Cockpit Tour: #24 - Probes/Window Heat Panel: What do all those buttons do?!

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The aircraft uses electrical heating for anti-icing each windshield and defogging the cockpit side
windows.
Two independent Window Heat Computers (WHCs), one on each side, automatically regulate the
system, protect it against overheating, and indicate faults.
Window heating comes on:
‐ automatically when at least one engine is running, or when the aircraft is in flight.
‐ manually, before engine start, when the flight crew switches ON the PROBE/WINDOW HEAT
pushbutton switch.
Windshield heating operates at low power on the ground and at normal power in flight. The
changeover is automatic.
Only one heating level exists for the windows.

Electrical heating protects:
‐ Pitot probes
‐ Static ports
‐ Angle-Of-Attack (AOAs) probes
‐ Total Air Temperature (TAT) probes.
Three independent Probe Heat Computers (PHCs) automatically control and monitor:
‐ Captain probes
‐ F/O probes
‐ STBY probes.
They protect against overheating and indicate faults.
The probes are heated:
‐ Automatically when at least one engine is running, or when the aircraft is in flight.
‐ Manually, when the flight crew switches ON the PROBE/WINDOW HEAT pb.
On the ground, the TAT probes are not heated and pitot heating operates at a low level (the
changeover to normal power in flight is automatic).

(1) PROBE/WINDOW HEAT pb
AUTO : Probes/Windows are heated automatically :
‐ In flight, or
‐ On the ground (except TAT probes) provided one engine is running.
ON : Light comes on blue. Probes and windows are heated permanently.