Daikin GYEQ20AN Service Manual page 147

SiAUY361411EA
6
Abnormal Discharge Temperature
Sub-code 0: While the unit is running, discharge temperature 1 rises beyond 120°C.
Sub-code 1: While the unit is running, discharge temperature 2 rises beyond 120°C.
Sub-code 2: While the unit is running, discharge temperature 1 remains equal to or higher than the discharge
Description
of the failure Sub-code 3: While the unit is running, discharge temperature 2 remains equal to or higher than the discharge
Sub-code 4: While the unit is running, discharge temperatures 1 and 2 both remain equal to or higher than the
Possible Sensor failure; refrigerant level too low; EV failure; four-way valve failure; SV failure; refrigerant piping clogged;
causes intake air temperature sensor failure; compressor failure; BS unit failure; outdoor heat exchanger clogged;
of the failure indoor heat exchanger clogged; short circuit; external filter clogged
Flow chart
Is Outdoor Heat Exchanger
Free From Clogging?
YES
Are Indoor Unit Filters
And Indoor Heat Exchanger
Free From Clogging?
YES
Is Unit Free From
Short Circuits?
YES
Is the BS unit
operating normally?
YES
Is Refrigerant Amount
Sufficient?
YES
Are SHS2 and
SHS5 30°C or Lower?
YES
Are Discharge Temperature
Sensors Operating Normally?
YES
Are Intake Air Temperature
Sensors Operating Normally?
YES
Is High/Low-Side Pressure
Appropriate?
YES
Are Pressure Sensors
Operating Normally?
YES
Is the external filter
free of defects?
YES
Check Compressor.
Troubleshooting
predicted temperature for 10 minutes.
predicted temperature for 10 minutes.
discharge predicted temperature for 10 minutes.
NO
Check Clogging.
NO
Check Clogging.
NO
Check Short-circuit.
NO
BS unit inspection
NO
Check Refrigerant Amount.
NO
Check Electronic
Expansion Valve
Check Four-Way Valve.
Check Solenoid Valves.
NO
Check Discharge
Temperature Sensors.
NO Check Intake Air
Temperature Sensors.
NO
Check Appropriate
Pressure Range.
See Flow Chart in "Abnormal
High-Side Pressure" Section.
See Flow Chart In "Abnormal
Low-Side Pressure" Section.
NO
Check Pressure Sensors.
NO
Check the external filter.
Flow Charts for Troubleshooting
025869-00EN03
Error
E6
code
136