Fujitsu ABHG18KRTA, Service Manual

Page: 271 / 471

2-38. E: 99. 4-way valve error (Outdoor unit)
Indicator Indoor unit
Operation indicator 9 time flash
Timer indicator 9 time flash
Economy indicator Continuous flash
Error code E: 99
Detective actuator
Indoor unit main PCB When 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.
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
Controller 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 thermistor of Indoor unit
• Isn’t it fallen off the holder?
• Is there a cable pinched?
Check characteristics of thermistor, refer to "E: 41. Room temperature sensor error (Indoor unit)" on
page 03-30 and "E: 42. Indoor unit heat exchanger sensor error (Indoor unit)" on page 03-31.
→ If defective, replace the thermistor.
↓
2-38. E: 99. 4-way valve error (Outdoor unit)
- (03-55) -
2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING