water alarm when tank full

We've just had a new pump fitted in our fresh water tank,when it's either 25%,75% or 100% full ,when we run the water the alarm goes off and it flashes on the control panel showing tank is 0% full,does'nt do it every time but often,it's going back to let the chap have a look at it,.You guys and gals are really clued up thought you would know,do you think it's the sensor? Thanks jubejube

Ours does exactly the same, and I seem to recall a thread on here a month or two ago when others had similar symptoms.

I've done nothing about ours yet, but cleaning the contacts with citric acid is a popular remedy.


(IF you can buy it now!!! With all the acid attacks and new legislation I'm expecting widespread bans of anything with the word acid in its name.)

Gromit wrote:
(IF you can buy it now!!! With all the acid attacks and new legislation I'm expecting widespread bans of anything with the word acid in its name.)

Well, that would be most interesting for deoxyribonucleic acid, so trying to imagine how a ban on this substance would be initiated and by who or what method.......................................Oh, for short, DNA 
Sorry off topic.