Installation and operating instructions WILO Mather and Platt
–
MISO / PISO Pumps
25
10 Faults, Causes and Remedies (For Bare Pump Only)
Symptoms
Possible cause of trouble and remedies
(Each number is defined in the table below)
--
Output too low
1,2,3,4,5
--
Pump does not prime or only intermittently
6,7,8
--
Pump leaks
9,10
--
Temperature of the pump increases
7,11,13
--
Noisy pump
10,11,14,15
--
The motor contactor trips
8,10,16,17
Causes
Remedies
1
Back pressure too high
Regulate a new the operating point
2
Pump or pipe work, not completely filled
Vent and fill the pump as well as the suction or in flow line
3
Suction lift too high or positive suction head too low
Check the liquid level; open the shut off valves on the suction side.
Clean the filters / strainers
4
Impeller sealing gap too large
Replace worn parts
5
Wrong direction of rotation
Change the motor connection
6
Pump casing ,shaft seal, foot valve or suction line leaks
Replace the casing seal. Check the shaft seal. Check the flange
connections
7
Suction lift too high or positive suction head too low
Check the liquid level; open the shut off valves on the suction side.
Clean the filters on the suction side
8
Loose or jammed parts in the pump
Open and clean the pump
9
Casing bolts not correctly tightened
Check the tightening torque of the casing bolts
10
Mechanical seal leaks
Check the seal surfaces and rubber material of the mechanical seal.
In case of damages exchange mechanical seal
11
Pump or pipe work not completely filled
Vent and fill the pump as well as the suction line or in flow line
12
Pump is running against closed valve
Open the shut off valve on discharge side
13
Pump or pipe work not completely filled
Purge of air the pump and the pipe work
14
Pump is not properly leveled or is distorted
Check the pump leveling and alignment
15
Foreign material in the pump
Dismantle and clean the pump
16
Earth fault
Check the earth connection.
Check the potential causes such as damaged wirings or cables,
leakages on electrical parts
17
Operating conditions outside of performance range of pump Refer to pump operating conditions stated in technical data
NOTE:
The above faults, causes and remedies are for pump only. Refer Motor / Engine manufacturers manual for the respective faults, causes
and remedies.
11 Decommissioning and recycling
Proper disposal and recycling of this product prevents damage to
the environment and risks to personal health.
Disposal in accordance with the regulations requires the product to
be drained and cleaned.
Lubricants must be collected. The pump components are to be
separated according to material (metal, plastic, electronics).
1. Use public or private disposal organizations when disposing of all
or part of the product.
2. For more information on proper disposal, please contact your local
council or waste disposal office or the supplier from whom you
obtained the product.
NOTE:
The pump must not be disposed of along with household waste!
Further information on recycling can be found at: www.wilo-
recycling.com
