Hi all, been asked to go look at a contactor setup on a pump which is only used for garden lawn sprinklers etc.. and as I don't often play with danfoss overloads and such I cannot work out what's up! I have no details on the load of the pump / model, make etc.. and only know that the pump was new last year. Basically the contactor is pulled in via a danfoss pressure switch or differential switch and then feeds the pump which they say usually sits running at all times until a gardena controller opens the water flow to feed the sprinklers. There is a C19 danfoss contactor and a TI16C overload on it, It's apparently been fine but now there is a constant quiet buzz when it pulls in and the load was sometimes pulling 16A and most of time 7.1A or so and slowly dropping to 5A or so but the pitch suddenly changes after maybe 30 secs max and either the overload breaks the contacts or it rises higher and doesn't trip the overload but strangely the contactor does stay in but no voltage or current through the overload and down to the pump. Pump is single phase, and overload is shown 2-3A and adjacent on side up to 7 odd amps. 16A rcbo feeding it all doesn't trip either. I am thinking pump is jammed maybe and taking overload as no water is coming through pipes. Anyone know how you set overload on that clear slider part on side as how can you differentiate between the front scale lower amps or rear scale higher ? it seems a crap design and danfoss technical do not provide anything like any help!! They're a waste of time entirely.