Samsung Error Code E4-64: High Pressure Trip

Severity
Warning
Type
digital display
Estimated repair cost: $250 — $600 (parts + labor)
Warning: Your Samsung heat pump has shut down due to a high-pressure fault. This prevents further operation until the issue is resolved.

How to Fix Samsung Code E4-64

  1. Step 1: Check the outdoor unit for any obstructions like leaves, debris, or snow blocking airflow. Clear away anything restricting the coil.
  2. Step 2: Ensure the condenser fan is running when the unit is calling for cooling. If the fan isn't running, the unit will overheat and trip the high-pressure switch.
  3. Step 3: If the problem persists after clearing obstructions and verifying fan operation, contact a qualified HVAC technician for diagnosis and repair.

How to Reset Samsung Code E4-64

  1. Turn off the unit using the remote control or wall controller.
  2. Turn off the circuit breaker for the outdoor and indoor units. Wait 60 seconds.
  3. Restore power at the breaker.
  4. Turn the unit on with the remote control. If the error returns, the fault needs professional diagnosis.

Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.

What Does Samsung Error Code E4-64 Mean?

The E4-64 error code on your Samsung heat pump indicates a high-pressure trip within the refrigerant system. Basically, the system detected that the refrigerant pressure went above a safe limit, so it shut down to prevent damage. This can happen for a few reasons, but it usually means something is restricting the flow of refrigerant or preventing proper heat dissipation. The high pressure can occur on either the high-pressure or low-pressure side, but this code is specific to the high-pressure side. Ignoring this error can lead to compressor damage or even a refrigerant leak, so it's important to address it promptly. This error will prevent the unit from cooling or heating.

Common Causes

  • Dirty outdoor coil restricting airflow
  • Failed or failing condenser fan motor
  • Refrigerant overcharge
  • Restriction in the refrigerant lines (kinked line, faulty TXV)
  • Non-condensables in the refrigerant (air, moisture)

Diagnostic Steps

If... Check Expected
Unit is tripped on high pressure Measure the refrigerant pressure on the high side with gauges Pressure should be within the normal operating range specified on the unit's nameplate. Significantly higher indicates a problem.
High-side pressure is elevated Check the condenser fan motor voltage Should read 208-230VAC. Low voltage indicates a failing motor or wiring issue.
Condenser fan is operating normally Check the temperature difference across the condenser coil There should be a significant temperature drop as refrigerant passes through the coil. A small temperature difference suggests poor heat transfer.
No obvious airflow or fan issues Recover refrigerant and weigh charge Match nameplate charge. Overcharged systems will have high head pressure.

Applicable Samsung Models

Replacement Parts

Part OEM Number Est. Cost Where to Buy
Condenser Fan Motor DA31-00287A — Find Part
High-Pressure Switch AQ150A1C — Find Part
Reversing Valve — — —

Related Codes on Same Models

Other codes that affect the same Samsung model families as E4-64.

Code Description Severity
E1 Communication Error Warning
E1-21 Compressor Overcurrent Warning
E1-54 IPM Fault Warning
E2 Room Temp Sensor Fault Warning
E2-14 Freeze Protection Active Warning
E3 Indoor Coil Sensor Fault Warning
E4 Outdoor Coil Sensor Fault Warning
E4-65 Low Pressure Trip Warning
E5 Inverter Overcurrent Warning
E6 Outdoor Fan Motor Fault Warning