I have hot water overflowing into the loft expansion tank?
Grundfos Selectric UPS 15-50 pump?
Grundfos Selectric 15-50 - noisy when on, intermittent banging?
Can I speed up my grundfos selectric 1550 pump?
How can reduce the noise made by my Grundfos ups 15-50 pump?
the pump stays on after the heating has switched off?
The pump appears to be operating when central heating is not on?
water is filling the header & expansion tank via the feed pipe to the pump?
grundfos MK 2 15/50 x 18 playing me for a fool?