Fujitsu GENERAL AOHG18KMTA, Service Manual

Page: 79 / 158

2-30. 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 →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.
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 03-55.
If defective, replace the thermistor.
2-30. E: 99. 4-way valve error (Outdoor unit)
- (03-35) -
2. Troubleshooting with error code
TR
O
U
B
LESH
O
O
TI
N
G
TR
O
U
B
LESH
O
O
TI
N
G