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Operating mechanism does not
Tripping voltage lacking ?
Auxiliairy contacts do not transmit
Secure the supply voltage
Position checking of spring condi-
Spring operating mechanism does not
Supply voltage lacking ?
Secure the supply voltage
Incorrect contact in the operating mecha-
nism due to the corrosion
Heating m.c.b. tripped ?
Heating voltage lacking ?
Heating resistor defective ?
Mechanism housing not tight
Secure the heating voltage
Replace the heating plate
Check the housing seals, if neces-