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Trane · Heat pump troubleshooting

Forcing a defrost - Trane 5TWR7

What is going on

Use to check defrost operation on the multi-speed heat pump.

Likely causes

  • Coil iced, need to verify defrost

Check in this order

  1. Unit must be running in heating with a thermostat call; forced defrost does not work in cooling.
  2. Hold the board's forced defrost button down for over 5 s.
  3. Display shows 7 as the first digit while defrosting.
  4. Normal demand defrost only arms when outdoor ambient is at or below 50 F and there has been a heat call for a set time.
  5. If defrost ends too early, clipping the defrost termination jumper raises the termination temperature.

Applies to: Trane 5TWR7024A-060A

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Source: Trane ODR-SVN002E-EN (5TTR7/5TWR7 installer's guide) - section Defrost Control. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.