Grundfos STP 2 fault 9

What it means

Pump running noisily on universal head pumps.

Likely causes

1. Pompanın montaj yüzeyinde titreşim var
2. Hot-water supply taken directly from top of hot-water cylinder
3. Entrapped air causing airlocks in supply pipe
4. Air not thoroughly purged from system
5. Undersized tank causing insufficient supply
6. Incorrect outlet height causing hot-water-only delivery
7. Outlet positioned below mains inlet causing air ingress
8. Non-return valve fitted incorrectly in inlet pipe causing restricted flow or pump damage
9. Undersized pipework
10. Pipes routed under floor causing air traps
11. Other outlets fitted in inlet pipes
12. Shared (non-dedicated) hot/cold supplies
13. Blanked-off pipes
14. Restrictions in flexible hoses
15. Unsecured pipework
16. Leak in system
17. Drip in system
18. Air trapped in pump
19. Non-return valve incorrectly fitted in inlet pipe
20. Direct mains connection causing pressure issues or pump damage
21. Jointing compounds/tape causing blockage or leaks
22. Shared supply pipe causing air ingress or reduced flow
23. Missing surrey flange causing air in hot water supply
24. Mechanical stress on pump from rigid pipe connection
25. Leaks from use of jointing compound instead of correct hose connections
26. Leak causing loss of tank air pressure
27. Leaks due to under-tightened or incorrectly connected hoses
28. Mechanical strain on pump from misaligned pipework
29. Leaks due to insufficient hose insertion depth
30. Blocked strainers common on initial pump installation or new buildings due to jointing compounds, tapes, flux and debris flushed through system
31. Debris ingress into pump causing blockage or damage if strainer omitted
32. Low flow rates from cistern filling causing frequent pump cycling
33. Solder joint heat damaging plastic pump components
34. Air pockets from incorrectly routed pipework
35. Restricted or kinked flexible hoses
36. Additional outlet fittings on inlet pipework causing incorrect flow switch operation

Where to start

1. Check hot-water supply connection point on cylinder
2. Inspect for airlocks in supply pipe
3. Purge all air from system