JULABO F34-EH Refrigerated and Heating Circulators - Manual (Page 30)

Troubleshooting guide / Error messages
30
Warning without a complete shutdown of the unit:
 Compressor stage 1 does not work.
The motor of the cooling compressor is equipped with an overload
protector, which will be activated by excessive temperature in the
capsule or by excessive current consumption. Poor air circulation
(distance to walls, dirt accumulated on condenser) may cause the
motor to be disconnected.
After a short cooling interval, the compressor motor will be
automatically reconnected and the message "E 21" no longer
appears.

The LED temperature display indicates the cause for the warning in
form of a code and an acoustic signal sounds in regular intervals.
These messages appear every 4 seconds.
Disturbances that are not indicated.
The electronic pump motor is overload-protected by an electronic current
limiter. If viscosity of the bath fluid is or becomes too high, the motor
stops running.
15
A
M
P
Circulator: Mains circuit breakers (resettable) 15 A
Cooling machine: Fuse T 10.0 A, dia.5 x 20 mm
The mains fuses (8b) on the rear of the unit may easily be exchanged as
shown on the left.
Warning:
Before exchanging the fuses, turn off the mains power switch and disconnect the
power plug from the mains socket!
Only use fine fuses with a nominal value as specified.
Example:
Manufacturer Supplier Type Order No.
Wickmann Wickmann G- fuse insert
T10,0A 5x20 mm
No. 19195