Panasonic U-72MF2U9 Service Manual page 183

3. 3WAY Alarm Codes
Check (1) When setting "installation of common use solenoid valve kit" is made by PC, check whether the
installation change was made in the same series of all indoor units or not.
(Check the software of address setting of PC.)
* In this case, "L11" alarm occurs at all indoor units' remote controllers.
(2) Check the condition of remote control group wiring where "L11" alarm occurs.
Check whether the group wiring is made with the indoor unit of a different solenoid valve kit or not.
Check whether the group wiring is made with the indoor unit of a different refrigerant circuit or not.
(3) Check the model of indoor unit connected to a remote control group where "L11" alarm occurs.
Check whether Type E1 indoor units are connected in the group wiring or not.
* Check the model of indoor unit with the item code 10 for the detailed setting of the remote control.
Correction (1) Perform "installation of common use solenoid valve kit" from PC in the same series of all indoor units.
(2) With a common use solenoid valve kit, change into the wiring that is allowed.
Example —
Notes This alarm may occasionally occur when connecting the common use solenoid valve kit.
L17 Alarm
Alarm code L17
Alarm meaning Model mismatch between outdoor units in one refrigerant circuit.
Alarm conditions This alarm occurs when a unit other than a R410A refrigerant model is connected.
Probable cause (1) A unit that uses R407C refrigerant, or a R22 model unit, was connected by mistake.
(2) The connected unit is correct, however the refrigerant type setting in the outdoor unit EEPROM
(item code 80) is incorrect.
Check (1) Check the refrigerant type at the connected unit.
(2) Use the outdoor unit maintenance remote controller and check the item code 80 refrigerant type.
If the setting is incorrect, change it to R410A.
Correction —
Example —
Notes The outdoor unit maintenance remote controller is required in order to set the refrigerant type in the
outdoor unit EEPROM.
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3WAY VRF SYSTEM
Trouble Diagnosis
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