Fujitsu R407C Service Manual page 117

LED display
Indoor Outdoor Remote
unit unit controller
Body PCB LED
LCD
LED 1 to 6
Error display
Error display Error display
(Thermistor
(Outdoor unit (Outdoor unit
error)
error) error)
Normal
Normal Normal
display
display display
or
error display
(High pres-
sure error)
Normal
Normal Normal
display
display display
or
error display
(Discharge
temperature
error)
Symptom that
Cause
can occur other
than title
Outdoor thermistor is faulty.
Outdoor fan capacitor is faulty.
Outdoor fan motor is faulty.
Outdoor unit electronic
expansion valves (EEV1, EEV2)
don't work.
Fully closed state (don't open)
during cooling operation.
Abnormal sound Ball valve and 3 way-valve are
is heard from not fully opened.
indoor unit.
Short-circuit of air circulation of
outdoor units occurred.
Outdoor unit heat exchanger is
blocked with foreign objects.
05-41
Check method
(Error state check method)
Check by measuring the
thermistor resistance and
comparing it to the ambient
temperature.
Check the capacity (11uF) and Resistance between fan motor
resistance of the capacitor. wires:
Blue-white
white-red
Voltage (AC 220-240V) is applied to
red-blue
motor, but motor does not rotate.
When the electronic expansion
When EEV1 and 2 are fully
valves(EEV1, EEV2)are working
closed during the cooling
correctly, the temperature of operation, the high pressure may
pipes which are before and after rise abnormally and the gas may
the electronic expansion valve is
become insufficient and the low
clearly different.
pressure may drop.
Turn off the power source of PCB
of the outdoor unit to initialize the
electronic expansion valves for
several times. Put a 3-minute in-
terval between each initializations.
The electronic expansion valve
may return to normal.
Check the positions of spindle Open the 3-way valve and ball
(handel) of the 3-way valve and valves fully.
ball valve.
Air discharged from an outdoor
unit is directly sucked into the
same outdoor unit or into another
outdoor unit.
Not enough space around Refer to the 'Design and Techni-
outdoor unit. cal Data' manual for the service
The surface of heat exchanger of
space.
outdoor unit was covered with If there is an obstacle covering
dirty or other foreign objects. the surface of heat exchanger,
remove it.
Remarks
Refer to section 7-2-1 to find the
correlation between the tempera-
ture and thermistor resistance.
When short or open circuit of
thermistor occurred.
: 60 ohms,
: 40 ohms,
: 20 ohms
Coil resistance (red-white,
red-orange, brown-blue,
brown-yellow) : 170~210