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Grundfos STP 2 fault 1C

The pump fails to start (thermal protection tripped)

Shower pump

What it means

Built-in thermal protection has switched off the motor.

Likely causes

  1. The built-in thermal protection has switched off the motor
  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. Wait for thermal protection to reset
  2. Switch off power supply for ten seconds
  3. Switch power supply back on

The full answer, free

  • 17 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