Fujitsu ADUH09LUAS1 Service Manual

2-27. E: 99. 4-way valve error (Outdoor unit)
Indicator
→ired remote
controller
Error code E: 99
Detective actuator
Indoor unit main PCB →hen the indoor heat exchanger temperature is
compared with the room temperature, and either
following condition is detected continuously two times,
the compressor stops.
Indoor heat exchanger temp. - Room temp. > 20 °F
(10 °C) (Cooling or Dry operation)
Indoor heat exchanger temp. - Room temp. < -20 °F
(-10 °C) (Heating operation)
If the same operation is repeated 5 times, the
compressor stops permanently.
Heat exchanger temperature
thermistor
Room temperature thermistor
4-way valve
Forecast of cause
Connector connection failure
Thermistor failure
Coil failure
4-way valve failure
Main PCB failure
Check point 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 mis-wiring, reset the power.

Check point 2. Check each thermistor
• Isn’t it fallen off the holder?
• Is there a cable pinched?
Check characteristics of room thermistor and indoor unit heat exchanger thermistor.
For the thermistor resistance value, refer to "Thermistor resistance values" on page 03-54.
 If defective, replace the thermistor.

2-27. E: 99. 4-way valve error (Outdoor unit) - (03-32) - 2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING

Fujitsu ADUH09LUAS1 Specifications

General

Brand	Fujitsu
Model	ADUH09LUAS1
Category	Air Conditioner
Language	English