Troubleshooting; Personnel Requisition; Safety During Troubleshooting; Error Table - Wilo Yonos MAXO Instrucciones De Instalación Y Funcionamiento

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If only the control module has to be brought into another position, the motor need not be pulled out of the
pump housing completely. The motor can be rotated in the pump housing into the desired position (follow
permissible installation positions). See the "Aligning the motor head" [} 53] chapter.
NOTICE
In general, turn the motor head before the system is filled.
Perform leakage test!
10

Troubleshooting

10.1

Personnel requisition

The troubleshooting must only be performed by a qualified specialist, work on the electrical connection must
only be performed by a qualified electrician.
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.
62
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.
Installation and operating instructions • Wilo-Yonos MAXO/-D/-Z • Ed.01/2022-08
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.