Mitsubishi Electric GUG-01SL-E Handbook page 30

No. Symptom
1 Air blowing through
the Dx-coil unit can-
not be cooled or
warmed.
2 The room is too cool
or too warm.
Cause
DIP switches (function selection
switches) on PCB A of the Dx-coil
unit are not set according to specifi-
cations.
Wrong connection of thermistor con-
nectors on PCB A of the Dx-coil unit
Ductwork defect between the
Lossnay unit and Dx-coil unit
Communication error between PCB A
and PCB B of the Dx-coil unit
PCB B of the Dx-coil unit is not func-
tioning.
Function settings of Dx-coil unit re-
mote controller (PZ-01RC) are set to
values other than "factory setting" val-
ues. (Except function setting No. 01)
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
cooling mode.
Communication error between the
Dx-coil unit and Lossnay unit
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
Target temperature of the Dx-coil unit
is too low or too high.
Temperature control selection of the
Dx-coil unit is wrong.
Processing capacity of the Dx-coil
unit is not sufficient for a room space.
DIP switches (function selection
switches) on PCB A of the Dx-coil
unit are not set according to specifi-
cations.
Wrong connection of thermistor con-
nectors on PCB A of the Dx-coil unit
─ 30 ─
Corrective action
Check the setting of the function selection
switches on PCB A of the Dx-coil unit.
Check the connector connections of CN23,
CN21, and CN29 on PCB A.
• Check for any defect including air leakage
from the duct between the Lossnay unit
and Dx-coil unit.
• Check for any problem including clogging
of the duct.
See 7-3 (3).
See 7-3 (1).
Check the function setting details of the
remote controller (PZ-01RC).
• 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 7-3 (3).
See 7-2 (6).
See the outdoor unit service handbook.
Check the temperature setting by Dx-coil
unit remote controller (PZ-01RC).
Check the setting of the function selec-
tion switch (SW1-7: Selecting of RA temp.
control or SA temp. control) on PCB A of
the Dx-coil unit.
Install an adequate Dx-coil unit.
Check the setting of the function selection
switches on PCB A of the Dx-coil unit.
Check the connector connections of CN23,
CN21, and CN29 on PCB A.