How to Fix / Troubleshooting

Safety first: Turn off power before inspection. Refrigerant handling must be done by certified personnel.

Steps:

Clean indoor components: Ensure indoor filters and coil are clean to prevent excessively low evaporating temperatures.
Check airflow: Confirm that supply and return air paths are not blocked by furniture or closed doors.
Inspect for oil stains: Look around flare joints and coil connections for oily residue indicating a refrigerant leak.
Technician service: A technician should check system pressures, locate leaks, repair them, evacuate, and recharge the system to the specified charge.
Sensor check: If pressures are normal, the low-pressure sensor or suction thermistor may be faulty and require replacement.

System stops with P7, often related to low ambient or abnormal pressure

Possible Causes