Pump Operation And Diagnosis - Bosch Worcester 2000 Series Installation And Maintenance Instructions Manual

Description
2973 – System fault, appliance electronics / basic
controller
2974 – Internal error
Table 31 Indicators and fault displays
11.3

Pump operation and diagnosis

The operation/fault indicator (
including any errors detected.
LED colour Description
Green - Normal operation
continuous
Green/Red - Warning mode (pump
blinking operating in an abnormal
condition, no risk for the
pump functionality).
Red - blinking Abnormal running mode
(pump stopped but still
functioning).
Red - continuous Pump stopped
No LED No power supply
Table 32 Pump operation and diagnosis
Worcester 2000 – 6 721 814 551 (2019/09)
Remedy
▶ Perform reset - factory reset.
▶ Check and replace control unit.
▶ Restart the appliance and check if fault remains.
▶ Check and replace control unit.
) will indicate the status of the pump
Diagnostic
Pump runs as expected
The pump is running but sent
a warning message.
The pump has stopped due to
external failure.
The pump will restart itself
after the disappearance of the
external failure.
The pump has stopped due to
permanent failure.
No voltage on electronics
Potential cause
Normal operation
• Dry run:
– The pump is operating
without water.
• Overload of motor:
– Friction due to particles and
/or impeller blocked with
debris and /or too high
viscosity.
• Generator operation:
– The pump rotor is driven by
an external flow.
• Under or Over voltage:
– Mains supply voltage
U<160V or U>280V.
• Overload of motor:
– Friction due to particles and/
or impeller blocked with
debris and/or too high
viscosity.
• Over speed:
– The pump rotor is driven by
an external flow above the
maximum allowed value.
• Over current:
– Abnormal current exceeding
the limit.
• Module over temperature:
– Temperature inside the
motor is too high.
• Turbine mode:
– The pump is driven by
external flow (>1200l/h) in
opposite direction of its flow.
• Faulty electronic module and/or
faulty motor.
• Pump is not connected to mains
supply
• Faulty LED
• Faulty electronics
Fault finding and diagnosis
Remedy
--
▶ Check appliance system
pressure and top up as required.
▶ Check installation water quality,
clean system if debris is
present.
▶ The pump will operate normally
when the external flow will be
stopped.
▶ Check mains voltage supply to
pump: 160V < U < 280V.
▶ Check installation water quality,
clean system if debris.
▶ Ensure that there is no other
external flow (additional
secondary pump running) on
the system.
▶ Check for leakage on appliance.
▶ Check for evidence of dry
running, low system pressure
and ambient temperature.
▶ Ensure that the external flow is
less than 1200l/h.
▶ Restart the appliance and wait
30 seconds before switching
back ON.
▶ Replace pump if LED is still red
after power restart.
▶ Check cable connection and
supply to pump.
▶ Check if pump is running.
▶ Replace pump.
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