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9-8-2. Troubleshooting when Multiple Indoor Units are Connected to Cool/Heat FS Unit
When multiple indoor units are connected to a Cool/Heat FS unit, it is necessary to set the Code No. [0E]. If
this setting is forgotten, normal operation is impossible.
[Case that Code No. [0E] is set]
All the indoor units which are connected to the identical
Cool/Heat FS unit operate according to the operation
mode of the header unit. The Cool/Heat FS unit keeps the
operation mode until all the indoor units will be
thermostat-OFF.
[Case that Code No. [0E] is not set]
As the Cool/Heat FS unit is controlled by the indoor unit
which is connected with inter-unit wiring, a normal
operation is unavailable.
(In the right figure, operation follows to the indoor unit A.)
If Code No. [0E] is not set, the symptom below appears:
When the following trouble occurred, confirm the Code No. [0E] and then set the Code No. referring to item
“How to connect multiple indoor units to a Cool/Heat FS unit”.
Cooling/Heating
FS unit
Indoor unit A
Indoor unit B
Remote controller
Inter-unit wiring
Refrigerant piping
Connection to remote controller group only is available.
Remote controller individual to each indoor unit is unavailable.
[1] [Cool] is set on remote controller
Indoor unit A Indoor unit B
Cool/Heat FS unit
Symptom
SVS SVSS SVD SVDD
Cooling operation1 Cooling operation ON ON OFF OFF Normal operation
Cooling operation2 Cooling thermo-OFF ON ON OFF OFF Normal operation
Cooling thermo-OFF3 Cooling operation OFF ON OFF OFF
Cooling mode is not applied to the indoor unit B. (Fan status)
[H06] An error (Low-pressure protective operation) may occur.
[2] [Heat] is set on remote controller
Indoor unit A Indoor unit B
Cool/Heat FS unit
Symptom
SVS SVSS SVD SVDD
Heating operation1 Heating operation OFF OFF ON OFF Normal operation.
Heating operation2 Heating thermo-OFF OFF OFF ON OFF Normal operation.
Heating thermo-OFF3 Heating operation OFF OFF ON OFF Normal operation.
[3] [Cool/Heat Auto] is set on remote controller
Indoor unit A Indoor unit B
Cool/Heat FS unit
Symptom
SVS SVSS SVD SVDD
Cooling operation1 Cooling operation ON ON OFF OFF Normal operation.
Cooling operation2 Cooling thermo-OFF ON ON OFF OFF Normal operation.
Cooling operation3 Heating operation ON ON OFF OFF Indoor unit [L18] error (Cool/Heat FS unit line error)
Heating operation6 Heating operation OFF OFF ON OFF Normal operation.
Heating operation7 Heating thermo-OFF OFF OFF ON OFF Normal operation.
Heating operation8 Cooling operation OFF OFF ON OFF Indoor unit B discharges warm wind.
Heating thermo-OFF9 Heating operation OFF OFF ON OFF Normal operation.
Heating thermo-OFF10 Cooling operation OFF OFF ON OFF Indoor unit B discharges warm wind.
Cooling thermo-OFF4 Cooling operation OFF ON OFF OFF
Heating mode is not applied to the indoor unit B. (Fan status)
[H06] An error (Low-pressure protective operation) may occur.
Cooling thermo-OFF5 Heating operation OFF ON OFF OFF
Heating mode is not applied to the indoor unit B. (Fan or stop status)
[P20] An error (High-pressure protective operation) may occur.
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