Manitowoc E16 Error Code — What It Means
The E16 error code on Manitowoc ice machines (CVD models) signals a Remote Condenser Fault. The control board has detected that the liquid line temperature has dropped below 40°F or climbed above 140°F for more than one continuous minute during a freeze cycle. This means the remote condensing unit is not operating within the safe refrigeration temperature range, so the heat exchange process is failing.
When the temperature exceeds 140°F, the condenser is not rejecting heat properly (usually because the fan is not running). When the temperature falls below 40°F, the system is either losing refrigerant or operating in an environment colder than the unit was designed for. The fault only activates during a freeze cycle and requires the out-of-range condition to persist for more than one minute before the board logs the error.
Before You Replace Anything
Technicians sometimes replace the control board thinking it is misreading the temperature sensor. Check the remote condenser fan motor circuit first, since a dead fan is the most common cause of E16 and is far cheaper to replace than the board.
Common Causes
- Condenser fan motor failure (~50%) The fan motor or its circuit has failed, preventing the condenser from dissipating heat and causing the liquid line temperature to exceed 140°F.
- Low refrigerant charge (~20%) A leak or undercharge in the refrigerant system causes the liquid line temperature to drop below 40°F.
- Dirty condenser coils (~15%) Restricted airflow from dust and debris buildup prevents proper heat exchange, which can push the liquid line temperature above 140°F.
- Low ambient temperature (~10%) Operating the machine in an environment colder than the design specification (below 40°F) causes the liquid line temperature to fall below the minimum threshold.
- Power or wiring issues to the remote fan (~5%) A tripped breaker, disconnected wire, or damaged harness to the condenser fan motor stops the fan from running.
Quick Diagnosis
Answer these to narrow it down fast.
Is the remote condenser fan spinning during a freeze cycle?
No: The fan motor or its circuit has failed. Check power and wiring to the fan. If power is present, replace the fan motor or capacitor.
Is the ambient temperature around the remote condenser below 40°F?
No: The ambient temperature is normal. Focus on the fan motor, coil cleanliness, or refrigerant system.
Are the condenser coils visibly clogged with dust or debris?
No: The coils are clear. If the fan runs but the error persists, suspect low refrigerant or a faulty control board.
Step-by-Step Fix
- Verify power to the unit. Check the main breaker and any disconnect switches. Confirm the unit is powered on and the remote condenser has voltage.
- Observe the remote condenser fan during a freeze cycle. If the fan is not spinning, the motor or its circuit is faulty. If the fan runs, continue to the next step.
- Inspect and clean the condenser coils. Remove any dust, dirt, or debris that could restrict airflow. Use a coil cleaner and a soft brush, then rinse if appropriate for your model.
- Check the ambient temperature around the remote condenser. If the room is colder than 40°F, the unit is outside its operating range. Relocate the condenser or install a low-ambient kit if available.
- Test the fan motor and capacitor. Use a multimeter to check for continuity in the motor windings and measure the capacitor if the motor is electrically sound but will not start. Replace the motor or capacitor as needed.
- Check refrigerant pressures. If the fan runs, the coils are clean, and the ambient temperature is normal but the error persists, suspect low refrigerant. Call a qualified technician to test pressures and recharge the system.
- Inspect wiring and connections to the fan motor. Look for loose, corroded, or damaged wiring between the control board and the remote condenser. Repair or replace any faulty wiring.
Parts Often Needed
| Part | Notes |
|---|---|
| Condenser fan motor | Amazon | The primary replacement for a fan that will not spin or has an open circuit. |
| Fan motor run capacitor | Amazon | Replace if the motor hums but does not start or if the capacitor tests out of range. |
| Control board | Amazon | Rare replacement for cases where the board incorrectly reads the temperature sensor after all other causes are ruled out. |
When to Call a Pro
Call a professional if the condenser fan motor tests good and the coils are clean but the error continues. A low refrigerant charge requires EPA-certified technicians to recover, test, and recharge the sealed refrigeration system. Also call a pro if you are uncomfortable working with high-voltage wiring or if the diagnostic steps do not reveal an obvious cause. Manitowoc recommends contacting their technical support at 888-235-9695 for complex refrigerant issues or unclear diagnoses. If the entire remote condensing unit is compromised, a licensed technician will need to replace the assembly and evacuate and charge the system.
Rough cost: A pro service call runs about $200-500.