26
SS-SVX07B-E4
Table 15 - Trouble-shooting (electric heating only)
Trouble-shooting
(electric heating only)
Controller troubleshooting
The controller has a built-in self-
diagnostic function. The following
LEDs are used to indicate the
problem or status.
Auto/High/Medium/Low LEDs
show fan speed setting.
Cool LED shows the COOL operating
mode.
- If the cooling fail protection is
active, this LED will be blinking
with the signal as per Figure 14, A.
- If anti-overheat or low ambient
protection is active, this LED will
be blinking with the signal as per
Figure 14, B.
Heat LED
shows the HEAT
operating mode.
- If the heating fail protection is
active, this LED will be blinking
with the signal as per Figure 14, A.
- If the compressor overload
protection is active, this LED will
be blinking with the signal as per
Figure 14, B.
7-segment LED
(2 digits) shows the
room temperature if lit, and the
setting temperature while blinking.
Dot LED
after the first digit of
7-segment LED, if blinking indicates
any of the room, freeze or defrost
sensor is open or short circuit.
Dot LED
after the second digit of
7-segment LED, indicates that the
compressor is on if lit, and indicates
either the freeze or defrost
protection is active if blinking.
Figure 14 - LEDs blinking signals
On-board setting
There is 1 jumper location on the
main control board which is related
to this setting. If the jumper is put at
OP4 location, both heat pump and
heater can be operated. If not, only
heat pump can be operated.
No heating.
A. Incorrect control switch setting.
1. Check the thermostat's set points and
operation.
1. Change the settings.
B. Defective control switch.
1. Check operation and the signal to the
heating device.
1. Repair or replace.
C. Defective heater temp. limit switch.
1. Check the heater temp. limit switch.
1. Replace the defective switch.
D. Unit wiring is incorrect.
1. Check the wiring.
1. Modify the wiring as indicated on
the wiring diagram.
E. The heater temperature limit switch
has opened.
1. Check tightness of the indoor unit's
fan on its shaft.
1. Tighten the fixing screws.
F. Dirty air filter.
1. Check the filter.
1. Clean the filter.
G. Indoor unit coil fins obstructed.
1. Check the filter is not missing.
1. Fix the filter.
H. Defective electrical component.
1. Check all the components are correct.
2. Check the fin block.
1. Replace the defective component.
2. Clean the fins.
Содержание MCD 048
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