E: 99. 4-Way Valve Error (Outdoor Unit) - Fujitsu ARXG45KHTA Service Manual

2-30. E: 99. 4-way valve error (Outdoor unit)

→ired remote
Indicator
controller
Indoor unit
Heat exchanger temperature
thermistor
Room temperature thermistor
Detective actuator
4-way valve
Forecast of cause
Check point 1. Check air filter condition
Check air filter dirty.
If the air filter dirty, clean up the air filter.
Check point 2. 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 3. 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
If defective, replace the thermistor.
2-30. E: 99. 4-way valve error (Outdoor unit)
Error code
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. > 10 °C
(Cooling or Dry operation)
Indoor heat exchanger temp. - Room temp. < -10 °C
(Heating operation)
If the same operation is repeated 5 times, the
compressor stops permanently.
"Thermistor resistance values"
- (03-36) -
E: 99
Air filter clogged
Connector connection failure
Thermistor failure
Coil failure
4-way valve failure
Main PCB failure
on page 03-58.
2. Troubleshooting with error code