LPH
Certikin Low Refrigerant Pressure / Low Suction

Display shows LPH or LP (Low Pressure) on Certikin heat pump; unit will not heat.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Low refrigerant charge due to leak, Blocked evaporator coil, Fan speed too low or fan not running, Faulty low-pressure switch

How to Fix / Troubleshooting

Safety first: Isolate power. Do not attempt to connect gauges or add refrigerant unless qualified.

  • Check airflow through evaporator: Ensure the coil is clean and free of leaves, dust, or ice build-up.
  • Fan operation: Confirm that the fan runs smoothly and at full speed when the unit is operating.
  • Ambient conditions: Very low ambient air temperatures can cause low-pressure trips; consult the Certikin manual for minimum operating temperatures.
  • Reset: After correcting airflow issues, reset the unit and monitor.

Repeated LPH faults indicate a likely refrigerant issue and require an F-gas certified technician to locate leaks and recharge the system.

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Repair Difficulty

Professional Required 5/5

Required Part

Certikin heat pump low-pressure switch / refrigerant circuit
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