Led Display On Pcb B Of The Dx-Coil Unit - Mitsubishi Electric GUG-01SL-E Handbook

(2) LED display on PCB B of the Dx-coil unit

The LED blink interval is 0.25 seconds for both on and off. The display duration is approximately 7 seconds.
LED11
Symptom
(green)
1 blink Temperature
control setting
error
( Only for
GUG-01SL-E)
2 blinks Drain water
overflow
0.25 s 0.25 s 0.25 s
ON
OFF
Error display example of LED11: Two blinks
Cause
The function selection switch (SW1-
7: Selecting of RA temp. control or
SA temp. control) on PCB A of the
Dx-coil unit is set to OFF "SA tem-
perature control."
Model selection switches (SW11-9
and SW11-10) on PCB B are set
incorrectly after a replacement of the
circuit board.
Drain pump drainage defect
Water sensor detection defect
─ 20 ─
7 s
Dx-coil unit GUG-01SL-E cannot be used
for SA temperature control.
Set the switch (SW1-7) to ON "RA tem-
perature control."
Check the model selection switches
(SW11-9 and SW11-10) on PCB B of the
Dx-coil unit.
Dx-coil unit GUG-01SL-E cannot be used
for SA temperature control.
Check the operation of the drain pump
by using the drain pump test run switch
(SW11-1) on PCB B of the Dx-coil unit.
( Refer to "Test run" on page 10 of the Dx-
coil unit installation instructions.)
<If the drain pump fails to operate>
• Check the connector connection of CN3
on PCB B of the Dx-coil unit.
• Check an output voltage of the connec-
tor CN3 on PCB B. When the output
voltage is normal, replace the drain
pump assembly. If it is abnormal, check
the power supply voltage.
If the power supply voltage is abnormal,
correct the voltage. When the voltage is
normal, replace PCB B (GU-01-E).
<If drainage of drain pump is poor>
• Check if the drain pump and drain piping
are clogged.
• Check that raising of drain piping and its
gradient are correctly constructed.
If the problem cannot be solved after
checking the above items, replace the
drain pump assembly.
• Stop and then operate the Dx-coil unit,
with the water sensor not submerged. If
the error occurs, replace the water sen-
sor.
• If the error still occurs even after the
replacement of the water sensor, replace
PCB B (GU-01-E) of the Dx-coil unit.
Corrective action