Manitowoc E15

What does Manitowoc E15 mean?

E15 indicates a fan cycle control fault caused by excessively low liquid line temperature. On air-cooled machines operating below 50°F ambient, a fan cycle control regulates condenser fan operation to maintain adequate head pressure. E15 logs when the liquid line temperature drops outside the allowable range during the freeze cycle, suggesting the ambient is too cold for the fan cycle control to maintain proper refrigerant conditions.

Symptoms

• Machine shuts down with E15 in the event log during cold ambient conditions.
• Liquid line temperature is below the allowable minimum when measured.
• Ice production is erratic or freeze cycles are unusually short in cold environments.
• Fan cycle control is not cycling the condenser fan as expected in cold weather.

Common causes

• Ambient temperature at the condenser is below 50°F, the threshold for fan cycle control activation.
• Defective fan cycle control not cycling the condenser fan off to build head pressure in cold weather.
• Low refrigerant charge causing liquid line temperature to drop below normal.
• Fan cycle control sensing tube or capillary failure giving incorrect pressure reading.

Diagnostic steps

1. 01

   Verify ambient temperature at the condenser

   Record ambient temperature at the condenser inlet. Below 50°F requires that the fan cycle control modulates fan operation. Below 35°F may be outside the rated operating range for the unit.

2. 02

   Check fan cycle control operation

   In cold ambient conditions, the condenser fan should cycle off periodically to allow head pressure to build. Confirm the fan cycle pressure control is opening and closing the fan motor circuit at the correct pressure cutout points per the service data.

3. 03

   Inspect the fan cycle control sensing connection

   Verify the fan cycle control capillary or sensing port connection to the high-side refrigerant circuit is secure and leak-free. A failed connection causes incorrect pressure sensing.

4. 04

   Measure liquid line temperature and refrigerant pressures

   Use a clamp thermometer on the liquid line and manifold gauges on the high side. Compare readings against published specifications for the operating ambient temperature.

5. 05

   Replace the fan cycle control if defective

   If the fan runs continuously in cold ambient without cycling, and pressure settings are verified out of spec, replace the fan cycle pressure control with the Manitowoc-specified replacement part.

When to call a professional

Fan cycle control replacement requires verifying correct pressure settings and involves working with the high-pressure refrigerant circuit. Engage a licensed technician if refrigerant charge is also suspect, as combined issues require EPA 608 certified service.