Grundfos STP 2 fault 5

What it means

Pump exhibits pulsing/surging on positive pressure pumps.

Likely causes

1. Evdeki diğer muslukların kullanımı pompanın anlık çalışmaya başlamasına neden olabilir (Use of other taps in the house causing pump to momentarily start)
2. Undersized tank causing insufficient supply
3. Incorrect outlet height causing hot-water-only delivery
4. Outlet positioned below mains inlet causing air ingress
5. Leak causing loss of tank air pressure
6. Low flow rates from cistern filling causing frequent pump cycling

Where to start

1. Musluk ve diğer tahliye noktalarının su darbesine neden olmadığından emin olun
2. Check tank capacity is at least 227 litres (50 gallons)
3. Measure height difference between cold-water outlet and hot-water cylinder supply