Diagnostic Procedure - Toshiba HFC R407C Service Manual

MAR-F104HTM8-PE, 3-pipe outdoor unit
Malfunction judgement is performed using the self-diagnostic function of the outdoor unit. The combination
of the display switches (SW1, SW2) and the LEDs (LD 71~LD 74) indicates the diagnostic details.
Located on the electrical inverter cover is a transparent window, which allows the 7-segment LED to be
viewed while the unit is in operation.
The transparent window has access holes to allow the adjuster pen, which is attached to the window,
access to alter the setting of the display switch SW1 and SW2 while the unit is running.
A slit is positioned at one end of the pen to locate onto the rotary switch.
The adjuster pen can also be used to push switches SW3 and SW4 during the diagnostic procedure
check.
A crimp connector is located on the other end of the adjuster pen. This connector can be used to 'short'
TP1 or TP2 connectors when performing manual operation of the outdoor valves.
No other component other than that supplied must be used to adjust the rotary switches. Failure to do
so may result in damage to the unit, malfunction or risk of electric shock.
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Diagnostic procedure

Outdoor unit