Daikin GYEQ20AN Service Manual page 164

Flow Charts for Troubleshooting
26
Outdoor Unit Electronic Expansion Valve Failure
Sub-code 0: During heating operation, the following conditions continue for 20 minutes: 1) SHS2 is equal to or
Sub-code 1: While the unit is running, the following conditions continue for 20 minutes: 1) SHS2 is equal to or lower
Description
of the failure
Sub-code 2: While the unit is running, the following conditions continue for 20 minutes: 1) SHS2 is equal to or lower
Sub-code 3: While the unit is running, the following conditions continue for 20 minutes: 1) SHS2 is equal to or
Possible causes EV failure; low-side pressure sensor failure; rib belt broken; check valve leak; SV failure;
of the failure four-way valve failure; SC coil failure; harness failure; main circuit board failure
Flow chart
Are EVs Operating Normally?
YES
Check whether harness
cables connected properly.
If the above checks reveal no problems, other parts may be faulty.
Leaks From Check Valve
Broken Compressor Belt
Low-Side Pressure
Sensor Failure
SV Failure
Four-Way Valve Failure
SC Coil Damage
153
lower than 2°C; 2) SHS2 is equal to or lower than 2°C; 3) SHS3 is higher than 3.5°C; 4) SHS4 is
higher than 3.5°C; 5) the high-side pressure minus low-side pressure is equal to or higher than
1000 kPa; 6) EV1 is equal to or lower than 50 pulses; 7) SV8 is OFF.
than 2°C; 2) SHS4 is equal to or lower than 2°C; 3) SHS1 is higher than 3.5°C; 4) the high-side pressure
minus low-side pressure is equal to or higher than 1000 kPa; 5) EV4 is equal to or lower than 50 pulses.
than 2°C; 2) SHS3 is equal to or lower than 2°C; 3) SHS1 is higher than 3.5°C; 4) the high-side pressure
minus low-side pressure is equal to or higher than 1000 kPa; 5) EV5 is equal to or lower than 50 pulses.
lower than 2.0°C; 2) SHS1 is higher than 3.5°C; 3) the high-side pressure minus low-side
pressure is equal to or higher than 1000 kPa; 4) EV6 is equal to or lower than 50 pulses.
NO
Check EVs.
Check Check Valve
Check Compressor Belts.
Check Low-Side
Pressure Sensor.
Check SVs.
Check Four-Way Valve.
Check SC Coil.
025894-00E
SiAUY361411EA
Error
J5
code
Troubleshooting