Biddle DF Manual page 34

en
F
AULTS
P
ROBLEM
Not all connected units are working
(or only partially).
If multiple units have been con-
nected to a single control panel:
Units (or part of a unit) are not
responding immediately to the
external control (door contact
switch or BMS).
The unit is blowing out cold air.
en-34
P C
OSSIBLE AUSE
The control panel is not communi-
cating with one or more connected
units (or with one of the control
PCBs in a dual-PCB unit).
The master unit (or the master
control PCB in a dual-PCB unit) has
not been configured properly.
The contact on the external control
input is open.
For water-heated units:
The unit is not being supplied any
hot water.
C A
OMFORT IR
R
ESOLUTION
1. Check if power is supplied to all
connected units.
2. Check the control cables:
• are they connected and free
from breaks?
• are they stretched out or
rolled up neatly?
• are they shielded from
magnetic fields?
3. Check the control PCB's fuses in
each connected unit.
4. Check wiring between
Connectors and and the
control PCB(s).
Check that the unit to which the
external control has been con-
nected has been configured as the
master.
For dual-PCB units:
Check whether the PCB on the
connection side has been config-
ured as the master.
Check the input bridges on the
units to which no external controls
have been connected.
For dual-PCB units:
Check the input bridge on the sec-
ondary PCB.
1. Check the central heating sys-
tem.
2. Check whether the valve is
allowing hot water to pass.
3. Check valve drive and inlet air
temperature sensor wiring and
connectors.
4. Take the drive from the valve,
and check the interior for
mechanical operation and
defects.
C
URTAIN