Fault Finding Chart; Disposal - Grundfos Unilift AP12 Instrucciones De Instalación Y Funcionamiento

8. Fault finding chart

Fault
1. Motor does not
start.
2. Motor protection/
thermal relay trips
out after short time
of operation.
3. Pump runs
constantly or gives
insufficient water.
4. Pump runs but
gives no water.

9. Disposal

Disposal of this product or parts of it must be carried
out according to the following guidelines:
1. Use the local public or private waste collection
service.
2. In case such waste collection service does not
exist or cannot handle the materials used in the
product, please deliver the product or any
hazardous materials from it to your nearest
Grundfos company or service workshop.
10
Cause
a) No electricity supply.
b) Motor switched off by level switch.
c) Fuses are blown.
d) Motor protection/thermal relay has
tripped out.
e) Impeller blocked by impurities.
f) Short-circuit in cable or motor.
a) Temperature of pumped liquid too high.
b) Impeller blocked or partly blocked by
impurities.
c) Phase failure.
d) Voltage too low.
e) Overload setting of the motor starter too
low.
f) Incorrect direction of rotation.
See section 4.1 Checking of direction of
rotation.
a) Pump partly blocked by impurities.
b) Discharge pipe or valve partly blocked
by impurities.
c) Impeller not properly fixed to the shaft.
d) Incorrect direction of rotation.
See section 4.1 Checking of direction of
rotation.
e) Incorrect setting of level switch.
f) Pump too small for the application.
g) Impeller worn.
a) Pump blocked by impurities.
b) Discharge pipe or non-return valve
blocked by impurities.
c) Impeller not properly fixed to the shaft.
d) Air in pump.
e) Liquid level too low. The suction strainer
is not completely submerged in the
pumped liquid.
f) Level switch does not move freely.
Subject to alterations.
Remedy
Connect the electricity supply.
Adjust/replace the level switch.
Replace fuses.
Wait until the motor protection trips
in again/reset the relay.
Clean the impeller.
Replace the defective part.
Use another pump type.
Clean the pump.
Call an electrician.
Call an electrician.
Adjust the setting.
Reverse the direction of rotation.
Clean the pump.
Clean the discharge pipe.
Tighten the impeller.
Reverse the direction of rotation.
Adjust the level switch.
Replace the pump.
Replace the impeller.
Clean the pump.
Clean the discharge pipe.
Tighten the impeller.
Vent the pump and the discharge
pipe.
Submerge the pump in the liquid or
adjust the level switch.
Make the level switch move freely.