E9-00" - Electronic Expansion Valve Abnormality (Units With No Pressure Sensor); Ea-00" - 4-Way Valve Abnormality - Daikin FTXTA30AW Service Manual

ESIE17-19C | Part 2. Troubleshooting
2.2.2.7. "E9-00" – Electronic expansion valve abnormality (units with no pressure sensor)
Trigger
1. No continuity of expansion valve.
2. Minimum expansion valve opening
and suction superheat < A K and
discharge superheat < B K.
Possible cause
Wet operation.
Faulty outdoor unit main PCB.
Faulty thermistor.
Faulty or disturbance of the power supply
(imbalance >10%). Power drop. Short cir-
cuit.
Faulty expansion valve.
Faulty capacity adapter on outdoor PCB.
External factory (e.g. electrical noise)
(cause when error is reset after power
reset, and error happens again after a
while).
More info:
Check procedures
"Main PCB" on page 56
"Refrigerant thermistors" on page 60
"Electronic expansion valve" on page 53
"Product specific information" on page 118
2.2.2.8. "EA-00" – 4-way valve abnormality
Trigger
The room thermistor / indoor heat
exchanger are not functioning within oper-
ation range.
Possible cause
Faulty 4-way valve coil.
Faulty 4-way valve body, blocked.
19/08/19 | Version 1.1
Optimized Heating 4
Effect
Unit will stop operating.
Check
Check for wet operation. (Wet operation
can be detected by checking the suction
superheat. If the suction superheat is 0°C
then liquid refrigerant is returned to the
compressor.)
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check if the outdoor main PCB receives
power.
Check thermistor.
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Check the expansion valve.
Check if the correct adapter is installed.
Check if the correct spare part is installed.
Check for source which could cause elec-
trical interference.
Replacing procedures
"Replacing main PCB" on page 95
"Replacing expansion valve body" on page 89
Effect
Unit will not stop operating.
Unit will stop operating.
Check
Check 4-way valve coil.
Check 4-way valve body.
2.2. Error based troubleshooting
Reset
Manual reset via user interface.
Power reset via outdoor unit.
Corrective action
In case wet operation was detected, con-
firm the cause:
• Refrigerant overcharge.
• Faulty expansion valve.
Adjust the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Replace thermistor when required.
Adjust power supply when required.
Power reset via outdoor unit.
Replace the expansion valve body or
motor when required.
Adjust capacity adapter when required.
Avoid electrical interference.
Reset
Automatic reset when unit runs without
error for 60 minutes.
Manual reset via user interface.
Corrective action
Replace 4-way valve coil when required.
Replace 4-way valve body when required.
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