F
AULTS
C
OMFORT
C
IRCLE
50
Table 7-3
Fault codes
C
ODE
L
IKELY
CAUSE
W
HAT
TO
DO
E1
The controller does not communi-
cate with one or more connected
units.
This fault may occur:
• when a connected unit has been
removed or replaced;
• due to a short failure in the
power supply to a connected
unit;
• due to incorrect cabling;
• due to a defect.
1.
Reset the controller (see section 8.3).
2.
Check if mains power is supplied to all connected
units.
3.
Check the control cables:
E2
Units that have an unallowed or
unknown unit code, or an unallowed
combination of unit codes, are con-
nected.
1.
Check and compare the unit codes on the type
plate (see sections 1.3.4 and 2.13).
The controller is live but does not
communicate with some unit.
1.
Reset the controller (see section 8.3).
2.
Check the control cables.
E6
Freezing risk due to too low dis-
charge air temperature. Frost pro-
tection has been activated (see
section 2.5.2).
Freezing may cause damage to
the heat exchanger.
1.
Ensure that the temperature in the room gets
higher than 8ºC.
2.
Check the operation of the CH system.
3.
Check the discharge temperature sensor’s wiring and
connection (connector X350).
You can prevent this fault by instructing the unit to switch
on the CH system in case of freezing risk (see section
2.15.4 and table 3-1).
F1
Fault in the automatic angle adjust-
ment.
1.
Delete the fault message (see section 7.4.2).
2.
In the controller, change the desired room tempera-
ture such that the controller switches from heating to
cooling, or the other way around, and check if the
angle adjustment ring moves.
3.
Remove any obstacles from the angle adjustment
ring’s range.
4.
Check wiring and connectors between the adjust-
ment motor, the microswitch and the PCB.
5.
Replace the angle adjustment drive.
F4
The temperature sensor in the con-
troller is defective.
1.
Replace the controller.
F5
The temperature sensor in the dis-
charge section does not work.
1.
Check the sensor’s wiring and connection (con-
nector X350).
2.
Replace the sensor.
