hunting

Hello all, I'm at my wits end... I have fairly recently taken the plunge and re fitted my entire bathroom. I should probably add at this point that I am not a plumber and before I undertook this mammoth task I had no plumbing experience whatsoever. I hope that this has not now let me down at...

My salamander pump (RSP100 2 bar pump) supporting 2 showers, works most times, but then once it has been used, and switched off, will not work again, starts pulsing, for another 15-30mins. But this is not alsways the case. it will usually come on again in the evening, or the following morning...