Technical data

Table Of Contents
FAULTS
6 720 803 687 (2012/11)62
Code Description Cause Possible solution / check
No indication No supply voltage applied to terminal block TB1.
The mains isolator upstream is switched off
Poor connection/contacts or terminal loose
Open phase (L, L1 or N).
Check mains isolator
Check and correct connection, wiring, phases and contacts
at TB1.
No voltage applied to power supply input on power
circuit board.
Poor connection/contacts or terminal loose
Power circuit board open phase
Disconnected plug (R or S).
Check and correct connection, wiring, phases and contacts
at TB1.
Check connection, wiring, phases and contacts on the
plugs on the power circuit board and correct if required.
The PCB receives no power.
Poor connection/contacts or terminal loose at
the CNDC plug, or plug pulled.
Check and repair contact at the CNDC plug on the PCB.
Check and repair contacts LD1 and LD2 at the power
circuit board and repair if required.
Poor connection/contacts or terminal loose at the
DCL or ACL transformer.
Check and repair contacts at the DCL transformer.
“LO” and “NO” on the interference suppressor board, R and
S on the power circuit board.
Power circuit board faulty. Replace faulty power circuit board.
PCB at the external unit faulty. Replace faulty PCB if the steps above have not removed the
problems.
Time limit exceeded for start of operation Check whether the electromagnetic compatibility of
terminals, power supply or the PCB is being compromised.
Switch the power supply off and on to restart the system.
F5 High pressure switch 63H
If no contact is signalled by high
pressure switch 63H for more than
3 minutes after applying the supply
voltage, fault display “F5” is shown.
Poor connection/contacts or terminal loose at the
63H plug on the PCB of the external unit or plug
pulled.
Check and repair contact at the 63H plug on the PCB.
Poor connection/contacts or terminal loose on the
63H.
Check and repair contacts and cable on the 63H.
63L tripped by faulty components. Test electrical components.
Replace faulty components.
Circuit board faulty. Replace faulty PCB.
EA Control cables between internal
and external unit faulty — too
many internal units connected
A test circuit recognises the number
of connected internal units
automatically. Fault message “EA”
will be displayed if a control cable
has a fault for longer than 4 minutes
after a power supply has gone 'live'.
Poor connection/contacts or terminal loose at the
control cable connections or wiring error.
Check and repair contacts, cables and control cable
connections for all appliances.
Control cables incorrectly sized. Check and correct control cable cross-section and cable
lengths: max. length 30 m.
Check and correct polarity of control cables S1, S2 and S3.
Transmitter/receiver circuit on external unit faulty. Switch supply voltage off and on and check if the fault
occurs again.
Replace PCBs of the internal or external units concerned if
the fault recurs. Check the control cables.
Transmitter/receiver circuit on internal unit faulty.
Noise in the control cables. Check the control cables and eliminate cause of noise.
Eb Control cable wiring fault
between internal and external
unit — phases reversed, no contact
A test circuit sets the number of
connected internal units
automatically. If the control cables
are faulty for more than 4 minutes
after connecting the power supply,
the fault display is “Eb” is shown.
Poor or detached contacts at the control cable
connections or wiring faults.
Check and repair contacts, cables and control cable
connections for all appliances.
Control cables incorrectly sized. Check and correct control cable cross-section and cable
lengths: max. length 30 m.
Check and correct polarity of control cables S1, S2 and S3.
Transmitter/receiver circuit on external unit faulty. Switch supply voltage off and on and check if the fault
occurs again.
Replace PCBs of the internal or external units concerned if
the fault recurs.
Check the control cables.
Transmitter/receiver circuit on internal unit faulty.
Noise in the control cables. Check the control cables and eliminate cause of noise.
Power circuit board on external unit faulty. Switch supply voltage off and on and check if the fault
occurs again.
Replace PCBs of the internal or external units concerned if
the fault recurs. Check the control cables.
Table 39 Fault indications, external unit