Fisher & Paykel AD55 Series, Service Manual, Page: 25 / 28

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Other Fault Codes –
There are many other fault codes, these refer
to faults on the PCB assembly itself. The
PCB assembly will have to be replaced in
these cases.
Record the fault code displayed and return
with the PCB assembly to Fisher & Paykel for
repair.
TESTING THE EXHAUST
SENSOR
At normal room temperature (25
o
C) the
resistance of the thermistor will be approx
2000 ohm and at O
o
C 1640 ohms.
Description –
The Exhaust Sensor consists of a device
called a thermistor, which is mounted on a
small piece of PCB attached to the wiring
harness.
Use a multi meter to test the resistance of the
sensor.
The thermistor is a device that changes its
electrical resistance according to the
temperature. The higher the temperature,
the higher the resistance thermistor.
DOOR SWITCH
ADJUSTMENT
The door switch should be adjusted so that
the door has opened no more than 40 mm –
65 mm before the PAUSE mode is activated
and the dryer stops.
Adjust door switch by removing hinge cover
(two screws). Loosen two screws holding the
switch.
If the door switch is not activated the
ED55/56 will sound a warning tone when the
START/PAUSE button is pressed.
BROWN OUT
If the mains voltage falls below a certain
voltage, even for a short period of time, it is
known as a brown out.
If this mains voltage falls below this minimum
voltage the Electronic Control System will not
be able to function correctly. The Electronic
Control System therefore is fitted with a
circuit that will automatically turn the dryer off.
The voltage at which this happens is between
165 – 170 volts.
During Brown Out the dryer will simply switch
off. The dryer can be restarted by simply
using the POWER button.