M
ANUAL
F
AULTS
Version: 6.1 (05-12-2011)
57
F2
For water-heated models:
Overheating.
This fault may occur if the control
valve does not work correctly.
1.
Switch the air curtain Off using the control panel, wait
for one minute, and switch it On again.
2.
Check that the connections of the supply and return
pipes have not been interchanged.
3.
CA S/M:
Check the LED on the valve drive: it should
come on when the unit is switched Off and On using
the control panel.
4.
Check the wiring and connectors of the valve drive
(X230) and the discharge air temperature sensor
(X350).
5.
Take the drive from the valve, and check the interior
for mechanical operation and defects.
F3
For water-heated models:
The central heating system switches
on later than the unit.
You may:
• switch on the central heating system earlier;
• have the central heating system switched on by the unit
(Function
61a/b Function of output
to
Heating ON
);
• switch off this error message at installer level (Function
72. Set error display
to
disable
).
For water-heated models:
Underheating.
This fault may occur:
• if not enough hot water is
supplied;
• if the control valve does not
work correctly.
1.
Check the central heating system:
-
is it turned on?
-
is it able to supply enough hot water?
2.
Check if the entire heat exchange element gets hot: if
not, vent it.
3.
CA S/M: Check the LED on the valve drive: it must
come on when a higher or lower heating strength is
being set.
4.
Check the wiring and connectors of the valve drive
(X230) and the inlet air temperature sensor (X360).
5.
Take the drive from the valve, and check the interior
for mechanical operation and defects.
Electrically-heated models:
There is too little heating because
one or more heating elements do
not work.
1.
Check the mains fuses.
2.
Check the wiring and connections of the heating
elements, using the wiring diagram as a reference.
If they are OK, a relay is defective: contact Biddle.
F3
For all models:
If the fans do not revolve:
1.
Delete the fault message (see section
5.3.2
).
2.
Check the fans. If one or more fans do not work,
check:
-
the fan wiring;
-
the connections on the printed circuit board
(connectors X130, X120 and X110);
-
the transformer fuse;
-
the transformer itself.
C
ODE
L
IKELY
CAUSE
W
HAT
TO
DO
