Mitsubishi Electric GUG-01SL-E Handbook page 31

No. Symptom
2 The room is too cool
or too warm.
3 Cool air comes out
while the Dx-coil unit
is operating in the
heating mode.
4 Water leaks from the
Dx-coil unit.
5 Drain pump fails to
operate.
6 Drainage water quan-
tity of the drain pump
is less.
7 The drain pump fails
to stop.
8 Even when the setting
of DIP switches (func-
tion selection switches)
are changed, functions
cannot be switched.
Cause
In the case of interlocking with the
City Multi indoor unit, operation mode
or target temperature is set by the
remote controller for the City Multi
indoor unit. (Operation mode or target
temperature of the City Multi indoor
unit remote controller does not affect
the Dx-coil unit.)
With a pre-heater connected to the
Lossnay unit, conditions for turning
ON the pre-heater is satisfied while
the Dx-coil unit is operating in the
heating mode.
Setting of the function selection
switches on circuit boards of the Dx-
coil unit, for which any setting change
is prohibited, is changed.
Defects related to the outdoor unit
The trial operation switch (SW2-1) is
set to ON.
Communication error between PCB A
and PCB B of the Dx-coil unit
Communication error between the
Dx-coil unit and Lossnay unit
The outdoor unit is in defrosting
operation.
The Dx-coil unit is installed in an
inclined state.
Drain piping defect (including faulty
connection, improper piping length, or
improper head height)
Refrigerant piping defect (including faulty
connection and insufficient heat insulation)
Drain pump drainage defect
Failure of PCB B of the Dx-coil unit.
Faulty connection of connector CN3
on PCB B of the Dx-coil unit
Wrong connection of the drain pump
connector.
Drain pump defect
Drain piping work defect
Drain pump defect
The residual operation is being pro-
cessed.
The test run switch (SW11-1) is set
to ON.
Water is accumulating in the drain
pan of the Dx-coil unit.
function selection switches were
switched while power is supplying to
the Dx-coil unit.
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Corrective action
• Set the operation mode and target tem-
perature of the Dx-coil unit by using the
Dx-coil unit remote controller (PZ-01RC)
even when interlocking with the City Multi
indoor unit.
• Check the model name of the remote
controller before operating it. (PZ-01RC:
BH00J360).
Check the operation of the pre-heater.
See 7-2 (6).
See the outdoor unit service handbook.
Check the trial operation switch (SW2-1) on
the control circuit board of the Lossnay unit.
See 7-3 (3).
See 7-3 (3).
It is not a failure.
See the installation instructions of the Dx-
coil unit.
See the installation instructions of the Dx-
coil unit.
See the installation instructions of the Dx-
coil unit.
See 7-3 (3).
See 7-3 (3).
Check the connector connection of CN3 on
PCB B.
Check that the drain pump connector is
connected to CN3 on PCB B.
Replace the drain pump assembly.
See the installation instructions of the Dx-
coil unit.
Replace the drain pump assembly.
Drain pump continues operation for approxi-
mately six minutes after the Dx-coil unit stops.
Check the test run switch (SW11-1) on
PCB B of the Dx-coil unit.
Check the condition of the drain pan.
Set the function selection switches while
power supply to the outdoor unit is shut off.