Cooper & Hunter EHC2 error code

What it means

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

Urgency

Likely causes

1. Cooper & Hunter Astoria R454B owner manual identifies EHC2 as working condition of the refrigerant sensor is out of range and leakage is detected.
2. The manual states the buzzer may continue for 5 to 6 minutes when EHC1 or EHC2 occurs.
3. The manual states these EHC leak-detection codes apply to units with refrigerant sensors.

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.

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.

• Cooper & Hunter Astoria Pro 6,000 BTU R-454B 208/230V (CH-PRO06MASTWM-230VI / CH-RHP06F9-230VO)

  Astoria Pro Series

• Cooper & Hunter Astoria Pro 9,000 BTU R-454B 208/230V (CH-PRO09MASTWM-230VI / CH-RES09-230VO)

  Astoria Pro Series

• Cooper & Hunter Astoria Pro 9,000 BTU R-454B 208/230V (CH-PRO09MASTWM-230VI / CH-RHP09-230VO)

  Astoria Pro Series

• Cooper & Hunter Astoria Pro 12,000 BTU R-454B 208/230V (CH-PRO12MASTWM-230VI / CH-RES12-230VO)

  Astoria Pro Series

Parts for this line

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

For your technician

Technician note: treat EHC2 as leak detection plus sensor operating-condition fault; follow A2L procedures, inspect for leaks, verify sensor environment/wiring, and replace only with specified sensor if required. Page context: Cooper & Hunter maps this display to the Astoria Pro Series line; source: manufacturer documentation; display convention: match the letter E, letter H, letter C, and two 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.

Related codes

Source

Next step