F
AULTS
C
OMFORT
C
IRCLE
48
Table 7-2
Fault finding by the installer
P
ROBLEM
L
IKELY
CAUSE
W
HAT
TO
DO
The controller displays
an E- or F-code
A fault has occurred in the
unit:
1.
Press any key of the controller.
2.
If the code disappears, the fault is no longer
current, and there is no need for immedi-
ate action.
3.
Refer to table 7-3 for resolving the fault if
the code does not disappear, or if the code
shows up frequently.
The controller works
normally but the unit
does not respond.
The fan is dead:
1.
Check the fuse on the electronics
2.
Check the wiring between the PCB and the
fan.
3.
Replace the transformer.
The unit does not
work, the controller
display is blank, and
the LED is not lit
The unit is dead:
Check the power connections, the wiring and
the fuse of the electronics module.
The connection between the
controller and the unit is not
correct:
Check the control cable.
The PCB does not work:
1.
Check the feeder cable.
2.
Replace the PCB.
The controller is defective:
1.
Check the controller by connecting it
to another unit.
2.
Replace the controller if it does not work.
The fan does not work
The fan is dead or defective:
1.
Check the fuse on the electronics
2.
Check the fan wiring.
3.
Replace the fan.
The fan does not
operate at a certain
speed
The connection for the rele-
vant speed is not correct:
1.
Check the wiring between trans-
former and PCB.
2.
Replace the transformer.
Not all connected
units are working
The controller does not com-
municate with one or more
connected units:
1.
Check if mains power is supplied to
all connected units.
2.
Check the control cables (see
section 2.13.3).
3.
Check the fuses in all connected units (see
