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Grundfos STP 2 fault 1B

The pump fails to start (fuses blown)

Shower pump

What it means

Pump fails to start due to blown fuses.

Likely causes

  1. The fuses are blown
  2. Solder joint heat damaging plastic pump components
  3. Air pockets from incorrectly routed pipework
  4. Additional outlet fittings on inlet pipework causing incorrect flow switch operation

Where to start

  1. Check fuses
  2. If new fuses blow, check the electrical installation
  3. Switch off power supply for ten seconds

The full answer, free

  • 18 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