Biddle DF Manual page 35

DF M
ANUAL
P
ROBLEM
The unit (or part of the unit) is
blowing cold air.
The LEDs on the control panel are
flashing.
Discharge air is not hot enough.
The unit continues to blow hot air.
The unit always blows cold air in
automatic mode.
If multiple units have been con-
nected to a single control panel:
Units are heating unevenly in auto-
matic mode.
Manual version 2.0 (26-10-2012)
P C
OSSIBLE AUSE
For electrically heated units:
The temperature cut-out has
turned the unit (or part of the unit)
off to prevent overheating.
w
This may indicate a seri-
ous fault that may be
hazardous.
This fault can also occur if the unit
has been powered down for a short
while.
For water-heated units:
The supply water temperature is
too low.
For electrically heated units:
One or more phases on the power
supply have tripped out.
For water-heated units:
The valve has been opened manu-
ally.
The temperature sensor is not
working.
The temperature is set indepen-
dently in each unit.
See also:
2.7.2 "Control panel settings" on page 18
2.7.3 "External control input" on page 19
2.7.5 "Unit settings" on page 20
2.7.6 "Multiple units operated from one control panel" on
page 21
6.3 "Fuses" on page 39
6.4 "Temperature cut-out" on page 39
R
ESOLUTION
1. Check and reset the tempera-
ture cut-out.
2. Check the fans. If one or more
fans do not work, check:
• the fan wiring;
• control PCB connections
• control PCB fuses
3. If these are okay, then replace
the fan.
Raise the central heating system's
water temperature.
Check the power supply's fuses and
electrical connections.
Turn the handle to the 'AUTO'
position.
1. Check Connector J3 on the con-
trol PCB.
2. Replace the sensor.
Configure one unit as a master.
en
F
AULTS
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