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Tucson Equinox fault 4.D

Air trapped in the system (pump fails to stop)

Shower pump

What it means

Pump fails to stop because air is trapped in the line/pump, causing continuous operation.

Likely causes

  1. Air trapped in the line/pump
  2. Air trapped in the system

Where to start

  1. Purge the system with the pump unpowered
  2. Remove the shower head and hose and hang into the shower tray
  3. Operate at full power for five minutes on both Hot and Cold outlets

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 15), 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 Tucson manual for the Equinox. Check the model on the data plate before you order parts.

Other Tucson Equinox fault codes