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11. Troubleshooting guide
Faults
Cause
Remedy
Motor fails to start
up
- No mains voltage
- Pump rotor blocked -thermostat
switched off
- Check voltage
- Dismantle and clean pump
No intake
- Intake valve not in water
- Pump chamber without water con-
nection
- Air in intake line air-tight
- Intake valve leaks
- Strainer (intake valve) blocked
- Max. suction height exceeded
- Immerse intake valve in water
- Fill water into intake
- Make sure intake line is close
- Clean intake valve
- Clean strainer
- Check suction height
Inadequate delivery
rate
- Suction height too high
- Strainer dirty
- Water level falling rapidly
- Pump performance diminishedby
contaminants part
- Check suction height
- Clean strainer
- Place the suction hose at a deeper
level
- Clean pump and replace wearing
Thermostat swit-
ches pump off
- Motor overloaded - friction caused
by foreign substances too high
- Dismantle and clean pump. Prevent
intake of foreign substances (filter)
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