Della / Econo Series
Della P5 error code
P5 means sub-cooling protection on cooling mode. In plain English, the unit is protecting against an indoor-coil freezing or sub-cooling condition.
- Urgency
- advisory
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
P5 means sub-cooling protection on cooling mode. In plain English, the unit is protecting against an indoor-coil freezing or sub-cooling condition.
Urgency
advisory
Clean the filter and reset once. If it returns, stop and call for service.
Likely causes
- Dirty filter or blocked indoor airflow
- Indoor fan moving too little air
- Indoor coil temperature sensor loose or failed
- Refrigerant flow or charge problem
Homeowner fix
Turn the unit off, clean the user-removable filter, and make sure furniture or curtains are not blocking the indoor unit. Reset once after the coil warms.
When to call a pro
Call a licensed HVAC technician if P5 returns after one safe reset or the condition will not clear. Tell them the official source lists P5 as Sub-cooling protection on Cooling mode.
This code points to refrigerant or sealed-system and electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
This fault is usually repairable. Replacement is worth comparing only if an older system also needs major board, compressor, or refrigerant-circuit work.
See Della mini-splitsYour Della model
Econo Series model pages in the Della catalog help compare this repair path with current replacement options.
- Della Econo 11,500 BTU R-32 115V (048-IF-11K1VR-17S-IN / 048-IF-11K1VR-17S-OUT)
Econo Series
- Della Econo 11,500 BTU R-32 208/230V (048-IF-11K2VR-17S-IN / 048-IF-11K2VR-17S-OUT)
Econo Series
- Della Econo 17,000 BTU R-32 208/230V (048-IF-17K2VR-17S-IN / 048-IF-17K2VR-17S-OUT)
Econo Series
- Della Econo 23,000 BTU R-32 208/230V (048-IF-23K2VR-17S-IN / 048-IF-23K2VR-17S-OUT)
Econo Series
For your technician
Technician note: verify filter/airflow, indoor fan operation, coil sensor connection/resistance, refrigerant pressures/flow, and PCB input. Source: Della official Econo support table, R410A lines 50-110 and R32 lines 44-104. Page context: Della maps this display to the Econo Series line; source: Della official support: Econo (lF) R410A and R32 Series Error Codes and Troubleshooting Guide; display convention: match the letter P and five marker exactly before comparing neighboring codes.
Which systems show it
Econo Series
Related troubleshooting
Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.
Related codes
Source
- Document
- Della official support: Econo (lF) R410A and R32 Series Error Codes and Troubleshooting Guide