Viessmann CS Installation And Operating Instructions Manual page 35

Fault Cause
Fault report F07 Refrigeration capacity too low
Fault report F08 Evaporator sensor defective
Fault report F09 Condenser sensor defective
Emergency operation switch actuated
Fault report F10
Fault report F11 EEPROM fault
Evaporator fan does not
The plug connector on the evaporator fan unit
start-up following expira-
is loose or not plugged in.
tion of the set delay (P35).
Water or ice droplets
are forming on the cold-
The evaporator fan draws in water droplets
room ceiling in the vicinity
accumulated on the evaporator lamella fins.
of the evaporator fan
outlet
Sheets of ice are
The evaporator ices up on the intake-side too
lying on the cell floor
heavily, the ice dislodges during the defrosting
beneath the evaporator
process and falls on the cell floor.
intake opening
The Control unit cannot
be operated; when actu- The keyboard lock is switched on so that the
ating any Control unit Control unit is secured against unauthorised
key, the indication "Bo.L" operation.
appears in the display
The Control unit cannot
be operated; there is no
temperature indication
The keyboard lock is switched on and the
in the display and the
temperature display is switched off so that the
decimal point moves back
Control unit is secured against unauthorised
and forth. When actuating
operation.
any Control unit key, the
indication "Bo.L" appears
in the display
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Page No. 35-GB
Remedy
By depressing one of the two keys [ ] or [ ], the cold-
room temperature will be indicated again The Fault
report appears if the evaporator temperature does not
reached the temperature set in P41, after the compres-
sor is switched on following the time set into P35. A
renewed Fault report is suppressed for 24 hours
Replace evaporator sensor
The Refrigeration unit continues running
However, the evaporator temperature is no longer
detected.
Defrosting may be impaired because of this
Replace condenser sensor.
The Refrigeration unit continues running.
The condenser fan runs at full turning speed
see 10.2 Emergency operation
Fault at the Control unit.
Your set values may have changed following a power
outage.
The report can be deleted by depressing one of the two
keys [ ] or [ ].
Replace Control unit
Plug in or secure the plug connector to the
evaporator fan unit.
Extend the evaporator fan start-up delay (P35)
so that remaining water droplets will freeze on the eva-
porator.
Reduce the defrosting pause time (see Control unit ope-
rating instructions) so that ice formation is reduced.
Switch off the keyboard lock (see 8.2.5 Password and
keyboard lock).
Release the display and keyboard as appropriate (see
8.2.5 Password and keyboard lock)
10.3
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