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8. Fault finding the product
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before
starting any work on the product.
Make sure that the power supply
cannot be accidentally switched
on.
Fault Cause Remedy
1. The motor does
not start.
a) No power supply. Connect the power supply.
b) The motor is switched off by the
float switch.
Adjust or replace the float switch.
c) The fuses are blown. Replace the fuses.
d) The motor protection or thermal
relay has tripped.
Wait until the motor protection
trips in again or reset the relay.
e) The impeller is blocked by
impurities.
Clean the impeller.
See section 7.1 Cleaning the
pump.
f) There is a short circuit in the cable
or motor.
Replace the defective part.
2. The motor
protection or
thermal relay
trips after a short
time of operation.
a) The temperature of the pumped
liquid is too high.
Contact your Grundfos
representative.
b) The impeller is blocked or partly
blocked by impurities.
Clean the impeller.
See section 7.1 Cleaning the
pump.
c) Phase failure. Consult an electrician.
d) The voltage is too low. Consult an electrician.
e) The overload setting of the motor-
protective circuit breaker is set too
low.
Adjust the setting.
3. The pump runs
constantly or
gives insufficient
water.
a) The pump is partly blocked by
impurities.
Clean the pump. See section
7.1 Cleaning the pump.
b) The outlet pipe or valve is partly
blocked by impurities.
Clean the outlet pipe or valve.
c) The impeller is not properly fixed to
the shaft.
Tighten the impeller.
d) The float switch is set incorrectly. Adjust the float switch setting.
e) The pump is too small for the
application.
Replace the pump.
f) The impeller is worn. Replace the impeller.
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