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5833 275 - 04
Vitotrans 300 Installation, Operating and Service
Service
System Pump Warnings Codes
Pump Code
Display
System Characteristics Cause
Measures
77
(S3HA/D3HA
-90 only)
Communication fault,
twin-head pump.
Communication between
pump heads disrupted or
broken.
Check that the pump heads are powered. One
pump head will display a yellow light and the
second pump head no light will be displayed.
88
Internal sensor fault.
The pump is receiving a
signal from the internal
sensor which is outside
the normal range.
Replace the pump head.
93
External sensor fault.
The pump is receiving a
signal from the external
control signal which is
outside the normal range.
Does the electrical signal set (0-10VDC) match
the control’s output signal? Refer to page 69.
If the control’s output signal does not match
replace the control PLC.
If the control’s output signal, does match replace
the pump head.
System pump warnings are displayed on the touch screen
user interface as a ‘Pump P1 Warning’. System pump (P1)
warning codes are displayed at the system pump. System
pump may continue to run, but will display a yellow
indicator light.
Remove right rear side panel to access the system pump.
Pump Code
Display
System Characteristics Cause
Measures
10
Pump communication
fault.
Internal pump
communication fault.
Replace the pump head.
See code (29) Forced pumping.
29
Forced pumping.
Other pumps or sources
forcing flow through the
pump even if the pump
is stopped and switched
off.
Check the system for correct position and / or
defective check valves and replace, if necessary.
40, 75
Undervoltage.
Supply voltage to the
pump too low.
Check that the power supply is within the
specified range.
51
Blocked pump.
The pump is blocked.
Remove pump head and remove any foreign
matter or impurities preventing the pump from
rotating.
57
Dry running.
No water at the pump
inlet or the water
contains too much air.
Prime and vent the pump before a new start-up.
Check that the pump is operating correctly. If not,
replace the pump head.
64
High motor
temperature.
Temperature in stator
windings too high.
Replace the pump head.
72, 84,
155, 157
Internal fault.
Internal fault in the pump
electronics.
Replace the pump head.
74
Overvoltage
Supply voltage to the
pump too high.
Check that the power supply is within the
specified range.
Note:
Carry out measures in the described order.
‘Pump P1 Warning’ is saved to the fault memory.
System pump faults are displayed on the touch screen user
interface as a ‘Pump P1 Fault’. System pump (P1) fault
codes are displayed at the system pump. System pump will
not operate and will display a red indicator light.
Remove right rear side panel to access the system pump.
Note:
Carry out measures in the described order.
‘Pump P1 Fault’ is saved to the fault memory.
System Pump Fault Codes
