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Vitotrans 300 Installation, Operating and Service
Service
System Faults
System Fault
Display
System Characteristics
Cause
Measures
Temp Sensor
T1A/B Fault
Vitotrans is not producing DHW.
System pump will not run.
No boiler demand signal available.
Lead break or faulty sensor
T1A/B.
Check sensor wiring connections
and sensor.
Replace sensor if necessary.
Pump P1
Dead Head
Fault
Vitotrans is not producing DHW.
System pump will remain powered
but will not run.
No boiler demand signal available.
System pump P1 has experienced
excessive head pressure and is
not able to provide flow.
Check internal isolation valves
to ensure they are open.
Safety High
Limit
Vitotrans is not producing DHW.
System pump will no longer be
powered.
No boiler demand signal available.
The DHW supply temperature has
exceeded the setting of the fixed
high limit.
Wait for the DHW to cool.
Reset the fixed high limit.
Flow Sensor
Fault
Vitotrans will not respond to
demand for DHW.
No flow of domestic water.
Faulty sensor.
Verify domestic water flow
through unit.
Check sensor power supply.
Check for signal.
Refer to page 63.
Replace sensor if required.
Temp Sensor
T2 Fault
Vitotrans will continue normal
operation, DCW temperature
displayed as “0ºF”.
Lead break or faulty sensor T2.
Check leads and sensor, replace
if required.
Temp Sensor
T4 Fault
Vitotrans will continue normal
operation, system return
temperature displayed as “0ºF”.
Lead break or faulty sensor T4.
Check leads and sensor, replace
if required.
Temp Sensor
T5 Fault
Vitotrans will continue normal
operation, DHW storage tank
temperature displayed as “0ºF”.
Lead break or faulty sensor T5.
Check leads and sensor, replace
if required.
System faults are displayed on the touch screen user
interface.
Note:
Carry out measures in the described order.
All system faults are saved to the fault memory.
