Fault finding and diagnosis
71
Worcester 2000 – 6 721 814 551 (2019/09)
Table 31 Indicators and fault displays
11.3 Pump operation and diagnosis
The operation/fault indicator ( ) will indicate the status of the pump
including any errors detected.
Table 32 Pump operation and diagnosis
2973 – System fault, appliance electronics / basic
controller
▶ Perform reset - factory reset.
▶ Check and replace control unit.
2974 – Internal error ▶ Restart the appliance and check if fault remains.
▶ Check and replace control unit.
Fault
code
Fault
category
Description Remedy
LED colour Description Diagnostic Potential cause Remedy
Green -
continuous
Normal operation Pump runs as expected Normal operation --
Green/Red -
blinking
Warning mode (pump
operating in an abnormal
condition, no risk for the
pump functionality).
The pump is running but sent
a warning message.
• Dry run:
– The pump is operating
without water.
▶ Check appliance system
pressure and top up as required.
• Overload of motor:
– Friction due to particles and
/or impeller blocked with
debris and /or too high
viscosity.
▶ Check installation water quality,
clean system if debris is
present.
• Generator operation:
– The pump rotor is driven by
an external flow.
▶ The pump will operate normally
when the external flow will be
stopped.
Red - blinking Abnormal running mode
(pump stopped but still
functioning).
The pump has stopped due to
external failure.
• Under or Over voltage:
– Mains supply voltage
U<160V or U>280V.
▶ Check mains voltage supply to
pump: 160V < U < 280V.
The pump will restart itself
after the disappearance of the
external failure.
• Overload of motor:
– Friction due to particles and/
or impeller blocked with
debris and/or too high
viscosity.
▶ Check installation water quality,
clean system if debris.
• Over speed:
– The pump rotor is driven by
an external flow above the
maximum allowed value.
▶ Ensure that there is no other
external flow (additional
secondary pump running) on
the system.
• Over current:
– Abnormal current exceeding
the limit.
▶ Check for leakage on appliance.
• Module over temperature:
– Temperature inside the
motor is too high.
▶ Check for evidence of dry
running, low system pressure
and ambient temperature.
• Turbine mode:
– The pump is driven by
external flow (>1200l/h) in
opposite direction of its flow.
▶ Ensure that the external flow is
less than 1200l/h.
Red - continuous Pump stopped The pump has stopped due to
permanent failure.
• Faulty electronic module and/or
faulty motor.
▶ Restart the appliance and wait
30 seconds before switching
back ON.
▶ Replace pump if LED is still red
after power restart.
No LED No power supply No voltage on electronics • Pump is not connected to mains
supply
▶ Check cable connection and
supply to pump.
• Faulty LED ▶ Check if pump is running.
• Faulty electronics ▶ Replace pump.
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