Mitsubishi water pump?

[proton]

New about 12 months ago, no problems until a few of weeks back. Now it will come on for a couple of seconds every 1-2 minutes. Turned everything off including the inlets on the toilets, still the same. Is this is this likely to be a small leak some where, or the pump? All the pipes are in concrete of course so no chance of finding a small leak.

 

This sort of pump

 

 

[Bill97]

Leak possible 

 

pressure valve defective possible

 

air in pump system possible 

 

 

triple check turned everything off and toilet running 

 

[novacova]

Possibly the solenoid, try tapping it and see if it responds. An easy fix.