Biddle Comfort Circle Series Manual page 47

M
ANUAL
P
ROBLEM
The unit does not
work, and the control-
ler display is blank.
One or more keys do
not work.
One or more units do
not work.
Version: 1.0 (22-09-2005)
Table 7-1 Correcting simple faults
L
IKELY CAUSE
If the LED is lit: the unit is in
pause mode.
If the LED is not lit: no power
is supplied to the controller.
If the display only shows the
room temperature: the unit is
switched off.
If the lock symbol is displayed:
the keys of the controller are
locked.
If the display shows the clock
symbol or the arrows symbol:
the unit is controlled by an
external control.
If the display shows more
symbols:
If you have a 6-key controller,
J
and the symbol is dis-
played:
If the display shows the clock
symbol or the arrows symbol:
the unit is controlled by an
external control.
W
HAT TO DO
Exit the pause mode by pressing the
Check the mains power supply:
• plug in power point;
• isolation switch;
• unit live.
Switch the unit on using the
To unlock the keys, press
simultaneously.
This is not a fault. Operation is limited by the
input signal from the external control.
For CC S: This is normal – the room tempera-
ture has been reached, and the fan switches off.
For CC M in mode: the room tempera-
AUTO
ture has become too high (when heating) or
too low (when cooling).
\
Press the key to switch on the ventilation
M
units – the symbol appears in the display.
This is not a fault. Operation is limited by the
input signal from the external control.
F
AULTS
=
key.
=
key.
+ - ?
, and
47