Everlasting COH

What does Everlasting COH mean?

COH is the condenser-overheated signal, described in the manual as a high-condensation warning. The controller reports it when condensing temperature, read from the condenser probe, reaches the high-condensation signalling threshold (parameter C6, defaulting to 60°C). It is an early warning that the condenser is heating up; if the temperature keeps climbing it escalates to the high-condensation alarm (CSd).

Symptoms

• COH shown on the controller display as a warning
• Condenser warm and possibly dusty or restricted
• Early sign of reduced heat rejection before a full CSd alarm
• Cooling performance starting to drop

Common causes

• Condenser beginning to clog with dust or dirt
• Reduced airflow across the condenser
• High ambient temperature around the cabinet
• Condenser fan underperforming

Diagnostic steps

1. 01

   Confirm the warning

   Read COH on the display; treat it as an early high-condensation warning that precedes the CSd alarm.

2. 02

   Clean the condenser

   Inspect and clean the condenser per the monthly maintenance instructions to restore heat rejection before the condition worsens.

3. 03

   Check airflow and ambient

   Ensure airflow around the unit is unobstructed and ambient temperature is within the cabinet's stated operating range.

4. 04

   Verify the condenser fan

   Confirm the condenser fan is running so heat is being carried away from the coil.

5. 05

   Monitor for escalation

   Watch whether COH clears after cleaning, or escalates to CSd, which indicates a more serious high-condensation condition needing service.

When to call a professional

Call technical support if COH does not clear after cleaning the condenser and confirming airflow and fan operation, especially if it escalates to the CSd high-condensation alarm. The manual reserves refrigeration-circuit and condenser-fan repairs for authorized specialist personnel, so a recurring overheating warning that routine cleaning cannot resolve should be diagnosed by a technician before it damages the compressor.