E: 99. 4-Way Valve Error (Outdoor Unit) - Fujitsu ACUH09LUAS1 Service Manual
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- Design & technical manual (96 pages)
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2-28. 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 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.
2-28. 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. > 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.
"Thermistor resistance values"
- (03-33) -
E: 99
Connector connection failure
Thermistor failure
Coil failure
4-way valve failure
Main PCB failure
on page 03-53.
2. Troubleshooting with error code
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