SiBE811001EB
Troubleshooting
CONVENI-PACK
208
8.4.29 Wet Operation from Refrigeration Suction Pipe
Error Code
F4
Applicable
Models
LRYEQ16AY1
Method of Error
Detection
Detect an error for discharge SH and suction SH of driving compressor
Error Decision
Conditions
These conditions continued for 10 minutes.
Defective electronic expansion valve of refrigeration side
Defective solenoid valve of refrigeration side
Excessive frost formation of refrigeration side
Refrigerant overcharge
Defective booster unit
Troubleshooting
&
Suction SH of refrigeration side < 5K
Discharge SH < 5K
Discharge pipe temperature < 60°C
Disconnected
thermistors (R3T, R5T) for
the booster unit, defective thermal
insulation, or defective
resistance value
Defective
valve body at the
electronic expansion valves
(Y1E, Y2E) of the booster unit,
disconnected coil, or
defective coil
YES
Repair the defective parts.
Repair the defective parts.
YES
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
YES
NO
NO
NO
Defective
expansion valve at
refrigeration side or displaced
feeler bulb
Excessive frost
formation in the indoor
unit
Defective
electric expansion valve
body or disconnected thermal
tube (There is leakage
when thermostat is
OFF)
YES
Repair the defective parts.
Repair the defective parts.
NO
YES
Check for disconnection of heater
Adjust the defrosting cycle.
Check whether charging amount
of refrigerant onsite is appropriate.
NO
NO
Booster
unit is connected and
discharge from the booster
is moist