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Grundfos STP 2 fault 3A

The flow from the shower drops (strainers blocked)

Shower pump

What it means

Reduced shower flow caused by blocked strainers.

Likely causes

  1. Strainers are blocked
  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. Inspect strainers for blockage
  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