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Samsung Heat pump fault E912

Flow switch close error

Heat pump

What it means

Water flow switch is stuck in closed position or continuously detecting flow when it should not

Likely causes

  1. Flow switch malfunction or stuck
  2. Flow switch connector short circuit
  3. Debris in flow switch
  4. Flow switch wiring shorted

Where to start

  1. Check flow switch for debris or blockage
  2. Inspect flow switch connector for shorts
  3. Measure flow switch resistance

The full answer, free

  • 1 more check in order
  • How to put it right, step by step
  • The manual page for this fault (page 85), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Samsung manual for the Heat pump. Check the model on the data plate before you order parts.

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