Safety During Troubleshooting; Error Table; Fault Signals - Wilo Yonos MAXO Installation And Operating Instructions Manual

10.2

Safety during troubleshooting

DANGER
Risk of fatal electrical shock!
There is a risk of fatal injury due to contact voltage after switching off the pump.
• Disconnect all-pole power supply before starting work.
• Begin work at least 5 minutes after disconnecting the power supply.
10.3

Error table

Error
Pump is not running with
switched-on power supply.
Pump is not running with
switched-on power supply.
Pump makes noises.
Pump makes noises.
Hot water does not get warm
within a short period of time.
Hot water does not get warm
within a short period of time.
10.4

Fault signals

• A signal is displayed.
• The fault signal LED lights up.
• The SSM contact opens.
• Switch off the pump and try a restart at regular intervals. During E10 switch off the pump permanently after
10 minutes.
No. Fault
E04 Undervoltage
E05 Overvoltage
1)
E09 Turbine operation
E10 Blocking
2) *
E21 Overload
E23 Short-circuit
E25 Contacting/ winding
Installation and operating instructions • Wilo-Yonos MAXO/-D/-Z • Ed.01/2022-08
Cause
Electric fuse defective.
No voltage.
Cavitation due to insufficient suc-
tion pressure.
Cavitation due to insufficient suc-
tion pressure.
Setpoint set too low.
Setpoint set too low.
Cause
Power supply on mains side
too low.
Power supply on mains side
too high.
Pump is operated backwards.
Rotor blocked.
Slow motor.
Motor current too high.
Winding defective.
Correction
Check fuse.
Check voltage.
Maintain pressure/increase system
pressure. Observe permissible
pressure range.
Check the delivery head and adjust
where necessary.
Increase setpoint.
Set operating mode Δp-c.
Remedy
Check mains voltage.
Check mains voltage.
Check the flow and install
non-return valve if necessary.
Contact customer service.
Contact customer service.
Contact customer service.
Contact customer service.
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