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Installation and operating instructions • Wilo-Yonos MAXO/-D/-Z • Ed.01/2022-08 33
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 5minutes after disconnecting the power supply.
10.3 Error table
Error Cause Correction
Pump is not running with
switched-on power supply.
Electric fuse defective. Check fuse.
Pump is not running with
switched-on power supply.
No voltage. Check voltage.
Pump makes noises. Cavitation due to insufficient suc-
tion pressure.
Maintain pressure/increase system
pressure. Observe permissible
pressure range.
Pump makes noises. Cavitation due to insufficient suc-
tion pressure.
Check the delivery head and adjust
where necessary.
Hot water does not get warm
within a short period of time.
Setpoint set too low. Increase setpoint.
Hot water does not get warm
within a short period of time.
Setpoint set too low. Set operating mode Δp-c.
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
10minutes.
No. Fault Cause Remedy
E04 Undervoltage Power supply on mains side
too low.
Check mains voltage.
E05 Overvoltage Power supply on mains side
too high.
Check mains voltage.
E09
1)
Turbine operation Pump is operated backwards. Check the flow and install
non-return valve if necessary.
E10 Blocking Rotor blocked. Contact customer service.
E21
2) *
Overload Slow motor. Contact customer service.
E23 Short-circuit Motor current too high. Contact customer service.
E25 Contacting/ winding Winding defective. Contact customer service.
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