Biddle SensAir, Manual

Page: 74 / 208

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F2 For water-heated models:
There is too much heating.
This error may occur if the control valve
does not work correctly.
1. Switch the unit 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. Check the wiring and connectors of the valve drive
and the discharge temperature sensor (X350).
4. 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 can:
• switch on the central heating system earlier;
• set the unit to turn on the central heating: Set
function 61. Function of outputs
to
Heating on and
connect the relevant output to the central heating
system.
• turn off this error message: Set function 21. User
interface options
>
Error display
to
Disable .
For water-heated models:
There is too little heating.
This error may occur:
• if not enough hot water is supplied;
• if the control valve does not work cor-
rectly.
1. Check the central heating system:
• is it turned on?
• is it able to supply enough hot water?
2. Check whether the heat exchanger only becomes
partially warm: if so, it needs venting.
3. Check the wiring and connectors of the valve drive
(X370) and the inlet temperature sensor (X360).
4. Take the drive from the valve and check the interior
for mechanical operation and defects.
For electrically heated models:
There is too little heating because one or
more heating elements do not work.
1. Check the fuses of the mains supply.
2. Check the wiring and connections of the heating ele-
ments, using the wiring diagram as a reference
If they are OK, a relay is faulty: Contact Biddle.
For all models:
If the fans do not rotate:
1. Check whether the fans are rotating. If one or more
fans do not work, check:
• the wiring of the fans;
• the connections on the printed circuit board
(connectors X60);
• the transformer fuse;
• the transformer itself.
F4 The temperature sensor in the control panel
is faulty.
The room temperature control now only
works with the sensor in the unit’s air inlet. Replace the control panel if you wish to have the room
temperature controlled by the sensor in the control
panel (if function
71. Indoor temperature sensor is set to
Control panel ).
If function 65. Control panel input is set to
Temperature : The external temperature
sensor is faulty or not connected to the con-
trol panel.
Check the wiring between the external temperature sen-
sor and terminal X426 on the wall holder. If this error
occurs repeatedly, replace the sensor.
C
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ROBABLE CAUSE
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HAT TO DO