Possible Faults On Step Motor Valves; Water Quality - Graf oneAdvanced Operation Manual

11.4 Possible faults on step motor valves

Observation
Valve does not close.
Valve does not open.

11.5 Water quality

In most cases, also nonprofessionals can recognise bad cleaning performance: The discharge
water is smelly, cloudy, and discoloured and contains a lot of suspended matter. The cause can
be technical problems, overload, or incorrect introduction. Identifying the cause is the job of a
specialist with the right knowhow and the right instruments. Consult the information in Subsec-
tion 6 "Operating instructions" on page 48.
11. Fault messages and rectification
Possible cause
Rated voltage not present
Motor winding defective
Gears defective
Valve seized
Rated voltage not present
Motor winding defective
Gears defective
Valve seized
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