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Cooper & Hunter / Astoria Pro Series

Cooper & Hunter ECC1 error code

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.

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Urgency
stop use
Verified
Jul 31, 2026
Fix path
Technician

What it means

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.

Urgency

Likely causes

  1. Cooper & Hunter Astoria R454B owner manual identifies ECC1 as other indoor unit refrigerant sensor detects leakage on multi-zone systems.
  2. The manual states ECC1 applies only to units with refrigerant sensors.
  3. The leak-detection section states the compressor stops and indoor fan starts when a refrigerant sensor detects leakage.

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.

This code points to refrigerant or sealed-system, compressor, and electrical or inverter work - get repair quotes from contractors in your area.

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Repair vs replace

R-454B leak-detection and refrigerant-sensor faults are normally repairable by a qualified technician. Compare replacement only if the system is older, out of warranty, or the diagnosis includes multiple major components.

See Cooper & Hunter mini-splits

Your Cooper & Hunter model

Astoria Pro Series model pages in the Cooper & Hunter catalog help compare this repair path with current replacement options.

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Parts for this line

The parts catalog for Cooper & Hunter Astoria Pro Series lists 5 sourced replacement parts for this product line.

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For your technician

Technician note: identify the originating indoor unit, follow A2L mitigation, inspect that unit and shared refrigerant circuit, verify sensor operation, and restore charge only after leak repair. Page context: Cooper & Hunter maps this display to the Astoria Pro Series line; source: manufacturer documentation; display convention: match the letter E, letter C, letter C, and one marker exactly before comparing neighboring codes.

Which systems show it

Astoria Pro Series

Related troubleshooting

Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.

Your mini split is showing a refrigerant leak codeMini split leaking waterMini split indoor unit freezing up

Related codes

FHCC Technician pathEHC1 error codeEL0C Technician pathEHC2 Technician pathECC1 Technician pathEE diagnostics

Source

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Document
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Sourced Jul 2026

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