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E4: Low Pressure Switch Trip (Trane)

Trane heat pump low pressure switch has opened due to suction pressure dropping too low.

What This Error Code Means

The refrigerant suction pressure fell below the minimum safe operating level.

Common Causes

  • Low refrigerant charge / leak
  • Refrigerant circuit restriction
  • Evaporator coil frozen
  • Airflow restriction over indoor coil
  • Liquid line filter drier restricted

Affected Brands

TraneCarrier

How ROMA Heating Fixes This

  • Check refrigerant pressures and temperature split
  • Look for signs of refrigerant leak
  • Inspect evaporator coil for frost or ice
  • Clean or replace air filter
  • Repair leak and recharge system

Why Trust ROMA Heating

24/7 Emergency

True round-the-clock service including weekends and holidays

Licensed Technicians

TSBC licensed and trained on all major heat pump brands

Fast Diagnosis

We know exactly how to interpret and resolve error codes

Related Services

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