Memmert TTC 256 Temperature test chamber (Generation 2003) - Manual (Page 45)

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Malfunctions and error messages
Error Possible causes Rectification
Insufficient cooling power Air inlet/outlet blocked Ensure that the fan opening on
the front side of the appliance is
not covered (see page 10 )
Air filter soiled Clean air filter (see page 63 )
Cooling unit iced up Set shorter defrosting intervals in
SETUP - Defrost (see Kapitel 7.5
Automatic defrosting system auf
Seite 54
Too little refrigerant Contact Customer Service
Air humidity cannot be ad-
justed (only for CTC climatic
test chambers)
Reliable climatic range
deceeded/exceeded
Set temperature setpoint within
climatic range, from 10 °C–95
°C, afterwards set the relative
humidity.
6.3 Power failure
In case of a power failure, the test chamber behaves as follows:
In normal and week time switch operating modes
After the power supply has been restored, operation is continued with the parameters set. The
time and the duration of the power failure is documented in the log memory (see page 57 ).
In programming mode
► After a power failure of less than 60 minutes, the current programme is continued from
the point at which it was interrupted. The time and the duration of the power failure is
documented in the log memory (see page 57 ).
► After a power failure of more than 60 minutes, the test chamber starts in manual operat-
ing mode for safety reasons and all setpoint values are changed to safe default values (see
table below).
For remote (PC) operation
If there is a power failure in remote operation, the test chamber starts in manual operating
mode for safety reasons and all setpoint values are changed to safe default values (see table).
Continuing the programme can only be done from the PC. The time and the duration of the
power failure is documented in the log memory (see page 57 ).
Parameter Default value
Temperature 20 ºC
Humidity (only for CTC 256) 20 % rh
Fan speed maximum