E: 99. 4-Way Valve Error (Outdoor Unit) - Fujitsu GENERAL ASHG18KMTE Service Manual

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

Indicator Indoor unit
Indoor unit
Heat exchanger temperature
thermistor
Room temperature thermistor
Detective actuator
4-way valve
Forecast of cause
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
If defective, replace the thermistor.
2-30. E: 99. 4-way valve error (Outdoor unit)
Operation indicator
Timer indicator
Economy indicator
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"
- (03-35) -
9 time flash
9 time flash
Continuous flash
E: 99
Connector connection failure
Thermistor failure
Coil failure
4-way valve failure
Main PCB failure
on page 03-55.
2. Troubleshooting with error code