Troubleshooting; Test Run - Mitsubishi Electric City Multi PAC-LV11M-J Installation Manual

7. Troubleshooting

7.1. Test run

Caution:
Before operating the unit, check that the wiring, piping, and thermistor are installed and that the switches have been set.
Refer to the "Test run" section of the indoor units and outdoor unit installation manuals.
After installation of an indoor unit, connection kit, and outdoor unit, begin a test run to check water leaks in the connection kit.
Be sure to perform a test run in cooling mode for each indoor unit installed. Make sure that each indoor unit operates
properly following the installation manual supplied with the unit.
If a test run is performed on all indoor units at once, improper connection of the refrigerant pipes and the indoor and outdoor unit
connecting wires cannot be detected.
Caution:
• Always use the remote controller to operate the indoor unit.
• When using a connection kit, operation from the outdoor unit is not possible.
• The following symptoms are not malfunctions.
.
Symptom
Indoor unit does not operate
even if set to cooling (heating )
operation
Indoor unit fan stops during
heating operation
* See the operation manual of indoor units for details.
** This mode is activated for approximately 1 minute to help avoid an insufficient supply of refrigerant during heating operation when
refrigerant is stored in an indoor unit that has been turned off or thermo-off.
• A hissing noise can be heard immediately after the air conditioner is started or stopped. This is the sound of the refrigerant flowing
inside a connection kit. The problem is insignificant.
22
Cause
The cooling (heating) operation cannot be operated
when the cooling (heating) operation of another
indoor unit is operating.
The fan stops during defrosting operation.
Fan stops when the refrigerant collecting mode ** is
activated.
When this occurs, the vanes close.
Indoor unit LED display *
Stand by
(For Multi System)
-
Stand by
(For Multi System)