SplitAtlas

Error-code hub

Cooper & Hunter error codes

Cooper & Hunter shows an alphanumeric code on the indoor unit display. The 6 codes below are the ones C&H publishes in homeowner-facing documentation - the set is small because the manufacturer's public literature is limited, not because these systems fail in fewer ways. If your code is not listed, ask your installer for the service manual rather than guessing from another brand.

See Cooper & Huntermini-splits ->Common FirstError Codes
Status displays
0
Error codes
6

Unit applicability

Match your unit before reading the table

This table is sourced for Astoria Pro Series. If your unit is a different generation or product line not named here, the same display code may vary by generation.

Astoria Pro Series13 models

Common codes first

Most broadly applicable documented codes

Ranking basis: we do not have failure-frequency telemetry. These are ordered by breadth of affected systems in the SplitAtlas catalog - the documented product line's published model count, whether the same code appears on more than one product line, and any manual applicability notes we hold. This is a breadth ranking, not a popularity claim.

ECC1

ECC1 means a different indoor unit on the same multi-zone system has detected a refrigerant leak. The fault may not be at the room where you see the code.

Stop useTechnician
Breadth evidence
13 published catalog models on its documented product line.
Safe first check
Do not restart cooling or heating. Ventilate the area if you suspect a leak, keep flames/sparks/smoking away, and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless a technician or emergency authority tells you otherwise; the manual says units with refrigerant sensors must remain powered except for service. Check the other indoor heads only from the room side for a displayed code or buzzer; do not open covers.
View the fix
EHC1

EHC1 means the built-in refrigerant sensor has detected a leak condition. The manual says the outdoor compressor stops and the indoor fan starts when the refrigerant sensor detects leakage.

Stop useTechnician
Breadth evidence
13 published catalog models on its documented product line.
Safe first check
Do not restart cooling or heating. Ventilate the area if you suspect a leak, keep flames/sparks/smoking away, and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless a technician or emergency authority tells you otherwise; the manual says units with refrigerant sensors must remain powered except for service. The remote can silence the buzzer on EHC1, but that does not make the system safe to run.
View the fix
EHC2

EHC2 means the refrigerant sensor is outside its expected working condition and leak detection is also active. Treat it as a refrigerant safety fault.

Stop useTechnician
Breadth evidence
13 published catalog models on its documented product line.
Safe first check
Do not restart cooling or heating. Ventilate the area if you suspect a leak, keep flames/sparks/smoking away, and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless a technician or emergency authority tells you otherwise; the manual says units with refrigerant sensors must remain powered except for service. The remote can silence the buzzer on EHC2, but that does not clear the refrigerant safety condition.
View the fix
EHC3

EHC3 means the refrigerant sensor is operating outside its expected range. Even without the manual's leak-detected wording, the leak-detection safety system cannot be trusted until serviced.

Stop useTechnician
Breadth evidence
13 published catalog models on its documented product line.
Safe first check
Do not restart cooling or heating. Keep ignition sources away if you suspect a leak and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless service or emergency personnel tell you otherwise.
View the fix
EL0C

EL0C means the Astoria unit is reporting a refrigerant problem: the system lacks refrigerant. This is not a refill task for a homeowner.

Stop useTechnician
Breadth evidence
13 published catalog models on its documented product line.
Safe first check
Do not restart cooling or heating. Ventilate the area if you suspect a leak, keep flames/sparks/smoking away, and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless a technician or emergency authority tells you otherwise; the manual says units with refrigerant sensors must remain powered except for service.
View the fix
FHCC

FHCC means the refrigerant sensor has malfunctioned. The manual says the sensor cannot be repaired and must be replaced only with the manufacturer-specified sensor.

Stop useTechnician
Breadth evidence
13 published catalog models on its documented product line.
Safe first check
Do not restart cooling or heating until the refrigerant sensor is serviced. Do not bypass the sensor. Keep the safety system powered unless service or emergency personnel tell you otherwise, and call a licensed HVAC technician.
View the fix

Cooper & Hunter mini-splits

Use the Cooper & Hunter catalog to connect these manual error codes to current model pages and replacement options.

See Cooper & Huntermini-splits ->

All error codes

ECC1

ECC1 means a different indoor unit on the same multi-zone system has detected a refrigerant leak. The fault may not be at the room where you see the code.

Stop useTechnician
Sourced Jul 2026
Applies to
Astoria Pro Series
Homeowner fix
Do not restart cooling or heating. Ventilate the area if you suspect a leak, keep flames/sparks/smoking away, and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless a technician or emergency authority tells you otherwise; the manual says units with refrigerant sensors must remain powered except for service. Check the other indoor heads only from the room side for a displayed code or buzzer; do not open covers.
When to call a pro
Call a licensed HVAC technician immediately. Tell them Cooper & Hunter identifies ECC1 as another indoor unit's refrigerant sensor detecting leakage on a multi-zone system.
View the fix ->

EHC1

EHC1 means the built-in refrigerant sensor has detected a leak condition. The manual says the outdoor compressor stops and the indoor fan starts when the refrigerant sensor detects leakage.

Stop useTechnician
Sourced Jul 2026
Applies to
Astoria Pro Series
Homeowner fix
Do not restart cooling or heating. Ventilate the area if you suspect a leak, keep flames/sparks/smoking away, and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless a technician or emergency authority tells you otherwise; the manual says units with refrigerant sensors must remain powered except for service. The remote can silence the buzzer on EHC1, but that does not make the system safe to run.
When to call a pro
Call a licensed HVAC technician immediately. Tell them Cooper & Hunter identifies EHC1 as refrigerant sensor detects leakage.
View the fix ->

EHC2

EHC2 means the refrigerant sensor is outside its expected working condition and leak detection is also active. Treat it as a refrigerant safety fault.

Stop useTechnician
Sourced Jul 2026
Applies to
Astoria Pro Series
Homeowner fix
Do not restart cooling or heating. Ventilate the area if you suspect a leak, keep flames/sparks/smoking away, and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless a technician or emergency authority tells you otherwise; the manual says units with refrigerant sensors must remain powered except for service. The remote can silence the buzzer on EHC2, but that does not clear the refrigerant safety condition.
When to call a pro
Call a licensed HVAC technician immediately. Tell them Cooper & Hunter identifies EHC2 as sensor out of range with leakage detected.
View the fix ->

EHC3

EHC3 means the refrigerant sensor is operating outside its expected range. Even without the manual's leak-detected wording, the leak-detection safety system cannot be trusted until serviced.

Stop useTechnician
Sourced Jul 2026
Applies to
Astoria Pro Series
Homeowner fix
Do not restart cooling or heating. Keep ignition sources away if you suspect a leak and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless service or emergency personnel tell you otherwise.
When to call a pro
Call a licensed HVAC technician. Tell them Cooper & Hunter identifies EHC3 as refrigerant sensor working condition out of range.
View the fix ->

EL0C

EL0C means the Astoria unit is reporting a refrigerant problem: the system lacks refrigerant. This is not a refill task for a homeowner.

Stop useTechnician
Sourced Jul 2026
Applies to
Astoria Pro Series
Homeowner fix
Do not restart cooling or heating. Ventilate the area if you suspect a leak, keep flames/sparks/smoking away, and call a licensed HVAC technician trained for R-454B/A2L equipment. Leave the unit's leak-detection safety system powered unless a technician or emergency authority tells you otherwise; the manual says units with refrigerant sensors must remain powered except for service.
When to call a pro
Call a licensed HVAC technician trained for R-454B/A2L refrigerant. Tell them Cooper & Hunter identifies EL0C as system lacks refrigerant.
View the fix ->

FHCC

FHCC means the refrigerant sensor has malfunctioned. The manual says the sensor cannot be repaired and must be replaced only with the manufacturer-specified sensor.

Stop useTechnician
Sourced Jul 2026
Applies to
Astoria Pro Series
Homeowner fix
Do not restart cooling or heating until the refrigerant sensor is serviced. Do not bypass the sensor. Keep the safety system powered unless service or emergency personnel tell you otherwise, and call a licensed HVAC technician.
When to call a pro
Call a licensed HVAC technician. Tell them Cooper & Hunter identifies FHCC as refrigerant sensor malfunction and says the sensor is replace-only with the manufacturer-specified sensor.
View the fix ->