Hitachi pump stop/start when running .

[Andrew Dwyer]

So, my Hitachi WM-P150XX pump is stopping (briefly, a second or two ) when running and appears to be getting more frequent.

 

Up until a few days ago it would run continuously when the toilet was flushed until toilet was full.

I first noticed it stopped once when filling, now it is stop/start 4 times.

Same for all other water outlets, bathroom sink, kitchen sink etc .

Water flow or pressure doesn’t appear to have changed though just an annoying stop/start frequency.

It now runs like someone has opened a tap just a little bit but the flow/pressure says otherwise.

 

Pump is around 3 or 4 years old.

 

Any ideas ?

[Crossy]

Water logged pressure tank.

 

You should be able to find the drain procedure online.

[Andrew Dwyer]

It’s a pump with the screw on bladder tank. I bought a replacement tank around 8 months ago for another issue ( loud knocking sound when pump shut off, this didn’t cure the problem but it disappeared a few days later, someone suspected the non return valve was open with a leaf of the suchlike ).

 

Tried replacing the original tank which gives me exactly the same stop/start issue ( now have 2 tanks that am not sure if good or not ! ).

 

Doesn’t appear any way to charge the tank, has a security torx screw in the top, have no idea how they charge these.

 

 

 

Will probably seek a local repair shop to see if they can check pressure in tank to eliminate.

 

What ya think ?