Repair or replace the engine.2)Pump blocked2a)Prolonged periods of inactivity .2b)Presence of solid bodies in the impeller2c)Bearings blocked2a)Unblock the pump by using a screw driver to turn the relevant notch on the back of the shaft.2b)Remove any solid foreign bodies inside the impeller2c)Replace the bearings.3)The pump functions but no water comes out3a)Presence of air inside the pump or suction pipe3b)Possible infiltration of air.3c)Foot valve blocked or suction pipe not fully immersed in liquid3a)Release the air from the pump using the delivery control valve.3b)Check which part is not tight and seal the connection.3c)Clean or replace the bottom valve and use a suitable suction pipe .3d)Clean the filter, if necessary, replace it .See point 2b)also.4)Insufficient flow4a)Pipes and accessories with diameter too small4b)Presence of deposits or solid bodies in the impeller4c)Rotor deteriorated4d)Worn rotor and pump case4e)Gases dissolved in the water4f)Excessive viscosity of the liquid pumped4a)Use pipes and accessories suitable for the specific application4b)Clean the impeller and install a suction filter4c)Replace the impeller4d)Replace the impeller and the pump casing4e)Perform the opening and closing manoeuvres through the feeder gate4f)The pump is unsuitable4g)Invert the electrical connections in the terminal board5)Noise and vibrations from the pump5a)Worn bearings5b)Unbalanced power supply5a)Replace the bearings5b)Check that the mains voltage is right6)Leakage from the mechanical seal6a)The mechanical seal has functioned when dry or has stuck6b)Mechanical seal scored by presence of abrasive parts in the liquid pumped6c)Mechanical seal unsuitable for the type of application6d)Slight initial drip during filling or on first start-upIn cases 6a), 6b)and 6c), replace the seal6a)Make sure that the pump casing is full of liquid and that all the air has been expelled.6b)Install a suction filter and use a seal suited to the characteristics of the liquid being pumped.6c)Choose a seal with characteristics suitable for the specific application6d)Wait for the seal to adjust to the rotation of the shaft.If the problem persists, see points 6a), 6b)or 6c).NM, NMS, NM4, NMS4 Rev. 24- Dimensions and weights -Disegno per lo smontaggio ed il rimontaggioDrawing for dismantling and assemblyNM4 0,37 - 1,1 kWWe CALPEDA S.p.A. declare that our Pumps NM, NMS, NM4, NMS4, with pump type and serial number as shown on the name plate, are constructed in accordance with Directives 2006/42/EC, 2009/125/EC, 2014/30/EU, 2014/35/EU and assume full responsability for conformity with the standards laid down therein.Commission Regulation No. 547/2012, 640/2009.- Via Roggia di Mezzo, 39 - 36050 Montorso Vicentino - Vicenza/Italia