Manitowoc Ice Machine Error Code E05: High Pressure Control Opened
E05 means the high pressure cutout on a Manitowoc Indigo ice machine opened three times within four hours. Make sure air can reach the condenser, leave the machine off if it keeps cycling, and call us. This is a safety stop, so repeated restarts are not a good idea.
High: a safety cutout is tripping repeatedly and the compressor needs protecting.
- Code
- E05
- Maker
- Manitowoc
- Equipment
- Ice machines
- Applies to
- Indigo series (non-NXT) control board, Event Log (Service menu > Event Log > View ELog)
What does Manitowoc error code E05 mean?
On Manitowoc Indigo ice machines without the NXT display, E05 is logged when the high pressure cutout switch opens three times inside a four-hour window. That switch is a safety device on the refrigeration system. If pressure on the discharge side climbs past its limit, the switch opens and cuts power to the compressor so the system cannot be damaged. The control board counts each opening, and the third one within four hours produces E05. Staff see the machine stop and then start again several times, and it may lock out if the pattern continues. It can trip again soon after a restart because the conditions that raised the pressure are still there. High pressure comes from the condenser failing to remove heat, from too much refrigerant or air trapped in the system, or from the switch itself. The cause could be as simple as a coil full of grease or as involved as a sealed-system problem, which is why the entry needs a technician's gauges to sort out. The display text for this entry is E05.
Affected models and control systems
Manitowoc Indigo series cubers with the non-NXT control board (Service menu > Event Log > View ELog). For pressure events.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Machine stops and restarts several times
- Ice production stops or falls sharply
- Warm cabinet and hot air at the condenser
- Machine locked out after repeated trips
Possible causes
Listed in Manitowoc's documentation
- Condenser coil and fan
- Water flow on water-cooled machines
- Ambient heat and clearance around the cabinet
- Refrigerant overcharge or non-condensables
- High pressure switch itself
Other likely causes — what usually sits behind error code E05 on this control. A technician confirms which one it is before any part is replaced.
- A condenser coil coated with kitchen grease that traps heat even after the surface looks fine
- A fan motor that runs but turns slower than its rating
- A water regulating valve that is sticking on a water-cooled machine
Safe checks before calling for service
- Make sure air can reach the condenser and nothing is stacked against it.
- Note how long the machine ran before it stopped.
- Leave the machine off if it keeps cycling.
- Tell us if the kitchen has been unusually hot.
- Call us, and have the model and serial number ready.
How a technician diagnoses error code E05
- Read the Event Log and confirm three high pressure openings and their times.
- Clean or inspect the condenser and measure airflow or water flow.
- Connect gauges and compare discharge pressure with the chart for the ambient temperature.
- Test the high pressure switch for continuity and its opening point.
- Check the refrigerant charge and look for non-condensables before any recovery.
- Reading discharge pressure requires refrigerant gauges, and opening the sealed system is regulated work.
- A tripping safety switch can hide an overcharge that only recovery and weighing will correct.
- Testing the switch and compressor contactor means working with live voltage behind the panel.
How error code E05 differs from similar codes
E05 is a counted safety event, three openings in four hours, unlike E04, which reports a temperature reading.
Technical reference
- Document
- Indigo Series Technician's Handbook 000014794 5/17, "Event Log" p.87-91
- Maker documentation
- Manitowoc owner support
- Edition
- Part Number 000014794 5/17
- Models / control
- Indigo series (non-NXT) control board, Event Log (Service menu > Event Log > View ELog)
- Section
- Event Log: code list p. 87, Event Log Detail table pp. 88-91 (Service menu > Event Log)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Manitowoc ice machine error codes
Is it safe to reset and run the machine after E05?
One restart is fine, but if it trips again, leave it off. Repeated high pressure can damage the compressor.
Will E05 clear itself?
The log entry stays, and the machine may run for a while after cooling, but the cause remains until it is cleaned or repaired.
Does hot weather cause E05?
It can, because a hot room makes the condenser work harder. A clean coil with good clearance usually handles it.
Need help with Manitowoc error code E05?
A technician confirms the cause on site and gives you the price in writing before any work starts.