Fujitsu ASU30RLE Service Instruction page 69

Trouble shooting 30
OUTDOOR UNIT Error Method:
4-Way Valve Error
Detective Actuators:
Indoor unit controller PCB circuit
Heat Ex. temperature thermistor
Room temperature thermistor
4-way valve
Forecast of Cause:
1. Connector connection failure
5. Main PCB failure
Test 1 : Check connection of Connector
Check if connector is removed.
Check erroneous connection.
Check if thermistor cable is open.
>> Upon correcting the removed connector or miss-wiring, reset the power.
OK
Test 2 : Check thermistor of Indoor unit
Isn't it fallen off the holder?
Is there a cable pinched?
>> Check characteristics of thermistor, (Refer to Trouble shooting 11,12),
If defective, replace the thermistor.
OK
Test 3 : Check the solenoid coil and 4-way valve
[ Solenoid coil ]
Remove CN6 from PCB and check the resistance value of coil.
Resistance value is about 1725 + 172.5
>> If it is Open or abnormal resistance value, replace Solenoid Coil.
[ 4-way valve ]
Check each piping temperature,
and the location of the valve by the temperature difference.
>> If the value location is not proper, replace 4-way valve.
OK
Test 4 : Replace Main PCB
If Test 1- 3 do not improve the symptom, replace Main PCB.
Indicate of Display:
Indoor Unit :
Operation lamp: 9 times Flash,
Timer lamp
ERROR CODE : [E : 99]
Detective details:
When the indoor heat exchanger temperature is compared with the
room temperature, and either following condition is decided
continuously two times, the compressor stops.
Cooling or Dry operation.
[Indoor heat exchanger temp.] - [Room temp.] >
Heating operation
[Indoor heat exchanger temp.] - [Room temp.] <
If the same operation is repeated 5 times, the compressor stops permanently.
2. Thermistor failure
-
(68°F (20°C))
02-33
Outdoor unit :
POWER
ERROR
MODE
: 9 times Flash
2
: Light OFF
3. Coil failure 4. 4-way valve failure
PUMP LOW PEAK
DOWN NOISE CUT
(L1) (L2) (L3) (L4) (L5) (L6)
9 9
: Light ON n : n times blinking
50°F (10°C)
-50°F (-10°C)