Siemens Water Heater SINVERT 350 Benutzerhandbuch

32 

 

o

 

Air inlet to switchroom is blocked 

o

 

Air outlet from switchroom is restricted 

o

 

Ambient temperature is too high 

Replace the defective components 
Check the parameter settings 

 

Clean or enlarge the air inlet 

Table 4-5 Faults 4 and 47 

Fault 4 (alarm): Inverter overload, I²t monitoring, stage 1 
Fault 33 (alarm): Inverter is signaling overtemperature, stage 2 

The CU has detected a current which is higher than the 
permissible l²t limit. 

o

 

Parameter setting error (CU software – 
current limit value) 

o

 

Parameter setting error (CU software - limit 
value I

2

t) 

 

Adjust the parameter settings 

Table 4-6 Fault 6 

(Alarm) overload 

The CU has detected a current which is higher than the 
selected permissible value. 
USI is defective 
AC current transformer defective 

Parameter setting error 

 

Adjust the parameter settings 

Table 4-7 Fault 12 

(Alarm) System is in commissioning mode 

The CU has detected that commissioning mode is 
selected 

The CU is in commissioning mode 

 

Set the CU operating mode to "Reversion" 

Table 4-8 Fault 14 

(Alarm) Fan has exceeded its useful life 

The hours counter in the CU has reached "0" (hours are 
counted backwards) 

The fan has operated for 35,000 hours since initial 
commissioning 

The value set initially for the hours counter was too low 
Replace the fan. 

 

Set the hours counter to 35,000 hours. 

The fans do not necessarily develop defects after working for this number of hours.