Mitsubishi Electric GUG-01SL-E Handbook page 32

(3) If the Lossnay unit to which the Dx-coil unit is connected fails to operate properly
*For symptoms other than the following, see the Lossnay service handbook.
No. Symptom
1 The Lossnay unit does
not operate even when
trying to operate it by
Dx-coil unit remote con-
troller (PZ-01RC).
2 The Lossnay unit does
not stop even when try-
ing to stop it by Dx-coil
unit remote controller
(PZ-01RC).
3 Air supply fan of the
Lossnay unit stops oc-
casionally.
4 The air volume of the
air supply fan decreas-
es.
5 Even when the exter-
nal signal is input to
change the fan speed
to 1 or 2, the Lossnay
unit operates at Fan
speed 3.
Cause
The function selection switch (SW7-1:
Setting whether or not the Dx-coil unit
is connected) on the control circuit
board is set to OFF.
The power of the Lossnay unit is not
ON.
Communication error between PCB A
and PCB B of the Dx-coil unit
Communication error between the
Lossnay unit and Dx-coil unit
The function selection switch (SW7-1:
Setting whether or not the Dx-coil unit
is connected) on the control circuit
board is set to OFF.
Lossnay is performing the night-purge
operation.
The pre-heater is connected to the
Lossnay unit.
Communication error between PCB A
and PCB B of the Dx-coil unit
Communication error between the
Lossnay unit and Dx-coil unit
The trial operation switch (SW2-1) is
set to ON.
The outdoor unit is in defrosting opera-
tion.
The outdoor unit is operating in heat-
ing standby mode.
The Lossnay unit is operating in the
protective mode (intermittent opera-
tion).
Water is accumulating in the drain pan
of the Dx-coil unit.
(In the case that water is detected by
the water sensor, even when the fan
speed of the Lossnay unit is set to Fan
speed 3 or 4, the supply fan runs at
Fan speed 2.)
The function selection switch (SW7-2
(and SW7-3): Selection of the opera-
tion mode from "Temp. priority mode"
or "Fan speed priority mode" (or
"Fan priority mode after temp. priority
mode")) on the control circuit board of
the Lossnay unit, or the function set-
ting (No. 72) of Lossnay remote con-
troller (PZ-61DR-E) is set to "Temp.
priority mode" or "Fan priority mode
after temp. priority mode."
─ 32 ─
Corrective action
Check the function selection switch
(SW7-1) on the control circuit board of
the Lossnay unit, or the function setting
(No. 71) of Lossnay remote controller
(PZ-61DR-E).
Check the power of the Lossnay unit.
See 7-3 (3).
See 7-3 (3).
Check the function selection switch
(SW7-1) on the control circuit board of
the Lossnay unit, or the function setting
(No. 71) of Lossnay remote controller
(PZ-61DR-E).
Check the screen display on Lossnay
remote controller (PZ-61DR-E) or cen-
tralized controller (AE-200E).
Lossnay stops three minutes later to
cool the pre-heater.
See 7-3 (3).
See 7-3 (3).
Check the trial operation switch (SW2-
1) on the control circuit board of the
Lossnay unit.
Check the screen display on Dx-coil unit
remote controller (PZ-01RC).
Check the screen display on Dx-coil unit
remote controller (PZ-01RC).
See the Lossnay service handbook.
Check the condition of the drain pan.
When the Lossnay unit is in the "Temp.
priority mode," and while the Dx-coil unit
is operating in the cooling or heating
mode, the Lossnay unit operates at Fan
speed 3, regardless of the external fan
speed input of Fan speed 1 or 2.