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Grundfos STP 2 fault 2F

The pump runs but delivers no water (isolating valves closed)

Shower pump

What it means

Pump runs but no water is delivered because isolating valves are closed.

Likely causes

  1. Isolating valves are closed
  2. Blocked strainers common on initial pump installation or new buildings due to jointing compounds, tapes, flux and debris flushed through system
  3. Debris ingress into pump causing blockage or damage if strainer omitted

Where to start

  1. Check isolating valve positions
  2. Inspect all flexible hoses and connections at least every six months
  3. Check for reduced shower flow performance indicating blocked strainers

The full answer, free

  • 3 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 14), right under the answer
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Safety: Isolate power and water, and prove dead before you open or test the pump.

From the Grundfos manual for the STP 2. Check the model on the data plate before you order parts.

Other Grundfos STP 2 fault codes