Water pressure pulsing

[JohnG]

As already said, do NOT adjust the pressure switch, particularly on an inverter pump. Unless you know exactly what you're doing you are likely to do a lot more harm than good.

[bluejets]

I'd go with JohnG.
Don't know what model your pump is but according to Hitachi manual on several inverter pumps, their run call comes from a pressure sensor ( not the usual pressure switch which is digital i.e. on-off)
The inverter style sensor monitors pressure in the line and depending on the number of outlets active, signals a control board ( analog signal) which ramps motor speed up or down to maintain pressure.
Not the sort of thing to go screwing with willy nilly.
These systems tend to be fairly constant without the need for intervention so I would be inclined to think that other factors have come to bear such as crap in the sensor or a faulty sensor perhaps.
Either way an accredited service person could be a good move.

Details can be found in .... water-pump-201207.pdf

look on the second page on the right hand side of the document.

Hope this helps...

[macca46]

If you want expert advice go and see Steve at Udon Hardware he will set you straight very quickly.

[vincemunday]

Totally agree, see Steve

[Little Italian Udon]

My pump is also pulsing and I solved the problem opening another tap, so while I'm taking a shower I also open the sink tap.

[glalt]

Try turning the pump off & the inlet valve.
Then drain the pump by the plastic plug at the bottom of the pump.
You should also take off the plastic plug on the top of the pump to allow it drain properly.
This allows air into the tank & gives you a cushion of air in the tank.
There is an air charging system on the pump to do this automatically but sometimes after running for long periods it needs a little help.
If you still have the manual on the pump it will show the plugs & air charging system

Excellent advice. That's commonly known as a water logged pressure tank. If there is no air head in the pressure tank, the pump will start and stop every few seconds.

[JohnG]

My pump is also pulsing and I solved the problem opening another tap, so while I'm taking a shower I also open the sink tap.

Shouldn't make any difference with an inverter pump, which should adjust pressure / volume automatically, as @bluejets described. If you need to do this with a regular pump you've either got a faulty pressure tank that needs venting (simple, see above), or need to clean the shower heater and shower head to get more flow (simple again) or you've got the wrong size pump. Problem with a standard pump is if you get it right for one outlet it'll probably be wrong for another, hence inverters.