Siemens Water Heater SINVERT 350 Manuel D’Utilisation

39 

Table 4-24 Fault 96 

(Alarm) Grid voltage outside tolerance 

The CU has detected that the grid voltage is outside the 
set tolerance limits 
Grid voltage outside tolerance 

o

  No power supply 

o

  Unstable power supply 

o

  Medium-voltage breaker has tripped (if 

installed) 

o

 Control 

oscillations 

o

  Supply point overloaded (voltage rise as a 

result of additional load) 

o

  Control (CU software) is not working correctly

Defective components 

o

 Transformer 

o

 AC 

capacitors 

o

 Restrictor 

o

 AC 

fuses 

o

 Drive 

Adjust the parameter settings 
Close the medium-voltage breaker 

 

Replace the defective components 

 

Table 4-25 Fault 97 

(Alarm) No checkback signal from the DC link contactor 

The CU has detected that the grid voltage is outside the 
set tolerance limits 
No checkback signal on the S7 
Interface contactor has not responded 

o

  Interface contactor is defective 

o

  Interface contactor has not operated 

o

  Interface contactor is blocked  

o

  Insufficient current supply to contactor coils 

Fault in signal power supply 
Wire break 

S7 relay output module defective 
Repair the interface contactor 
Replace the interface contactor 
Repair the power supply 
Use a higher-capacity power supply 
Replace the cabling 

 

Replace the S7 relay output module 

 
 
 
 

Table 4-26 Fault 98