Freshwater system problem

[Kelpie]

Can anybody help me diagnose a problem with a freshwater system? There's a pump, a pressure switch, and an accumulator tank. Recently the pump has been failing to kick in, and I was finding that a wee wiggle of the pressure switch was generally sufficient to make it spring back into life. But the other day the opposite happened- the pump just began to run continuously, even though the tap was off.

Does this sound like I need a new pressure switch? I notice that there's a turny knob thing on it, might that be of help?

 

[ffiill]

The pressure switch is adjusted by the knob.Turn the tap full on and operate the knob to see if it has any effect.
The real big problem I experience is because the pump spends months not in use the brushes in the electric motor stick.Sometimes all it needs is a good spin by hand and usually you can do that in situ by removing the pump body and accessing the drive spindle.
The other issue can be a leak in the system.Several years ago my pipes froze and split in a most obscure place.@

 

[Len Ingalls]

Can anybody help me diagnose a problem with a freshwater system? There's a pump, a pressure switch, and an accumulator tank. Recently the pump has been failing to kick in, and I was finding that a wee wiggle of the pressure switch was generally sufficient to make it spring back into life. But the other day the opposite happened- the pump just began to run continuously, even though the tap was off.

Does this sound like I need a new pressure switch? I notice that there's a turny knob thing on it, might that be of help?

Sounds like points (contacts ) in P-Swx to me. Sandpaper if accessible. Replace P-Swx otherwise.
Another possibility- the P-Swx pressure sensing tube/passageway is blocked with corrosion crud.

Cheers/ Len

 

[superheat6k]

I had a vaguely similar problem that was caused by limescale fouling the switch mechanism.

 

[KellysEye]

You might need to take the pump apart it could be the pressure switch, which I would replace, or a broken diaphragm. If it runs continuously turn it off quickly or the motor will burn out.

 

[Kelpie]

Sounds like points (contacts ) in P-Swx to me. Sandpaper if accessible. Replace P-Swx otherwise.
Another possibility- the P-Swx pressure sensing tube/passageway is blocked with corrosion crud.

Cheers/ Len

Thanks, where would I find the contacts? I take it you don't mean the wires that connect the switch to the pump?

 

[SandgroperWA]

I had the same problem. Cleaned and replaced the spade clips / electrical connectors. Drove me nuts. Failed just as I got in the shower, bought a complete new pump and switch. About $230 AUD. No dry showers any more! Keeps me and more importantly my girl happy.