E: 99. 4-Way Valve Error (Outdoor Unit) - Fujitsu ASUG12LZAS Service Manual

2-23. 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.
2-23. E: 99. 4-way valve error (Outdoor unit)
Operation indicator
Timer indicator
Economy indicator
Error code
main PCB
↓
"Thermistor resistance values"
↓
- (03-35) -
9 time flash
9 time flash
Continuous flash
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. > 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.
Connector connection failure
Thermistor failure
Coil failure
4-way valve failure
Main PCB failure
E: 99
on page 03-77.
2. Troubleshooting with error code