What does each Manitowoc Indigo (original) code mean?
22 documented codes and fault signals for the Manitowoc Indigo (original), verified against service documentation. Find your code in the table below, click through to its section for the full explanation, causes, DIY steps, and when it needs a technician.
Which machines show these codes?
Which machines show this code: the original Indigo series is Manitowoc's previous-generation full-size cuber (model numbers like IY and ID), sold roughly 2010 through the late 2010s — the machines now in the middle of their service life, old enough to show wear-related faults but usually young enough to be worth repairing. They use nearly the same E-code list as the newer Indigo NXT, displayed on a smaller screen with keypad navigation instead of a touchscreen, and a few thresholds differ between generations (the curtain-switch fault, for example, trips at 12 hours on the original Indigo versus 24 on the NXT). If your display is a touchscreen, read the Indigo NXT version of this code instead — the diagnosis is similar but the details are generation-specific.
Full code table
| Code | What it means | DIY or tech? |
|---|---|---|
| E01 | Long freeze cycle | Often fixable in-house |
| E02 | Long harvest cycle | Often fixable in-house |
| E03 | Input power loss | Often fixable in-house |
| E04 | High condenser temperature | Typically needs a technician |
| E05 | High pressure cutout (HPC) | Typically needs a technician |
| E07 | Starving TXV or low on charge | Typically needs a technician |
| E08 | TXV fault | Typically needs a technician |
| E09 | #1 evaporator flooding | Typically needs a technician |
| E10 | #2 evaporator flooding | Typically needs a technician |
| E11 | Refrigeration fault | Typically needs a technician |
| E12 | Curtain switch fault | Often fixable in-house |
| E13 | Spare (reserved) code | Typically needs a technician |
| E15 | Fan cycle control fault / low liquid line temperature | Typically needs a technician |
| E16 | Remote condenser fault | Typically needs a technician |
| E19 | Ice thickness probe fault | Typically needs a technician |
| E20 | Water system fault | Often fixable in-house |
| E25 | Bin level probe low sensor fault | Often fixable in-house |
| E26 | Bin level probe medium sensor fault | Typically needs a technician |
| E27 | Bin level probe high sensor fault | Typically needs a technician |
| E28 | AuCS accessory fault | Typically needs a technician |
| E33 | Keyboard fault | Typically needs a technician |
| E34 | Display fault | Typically needs a technician |
- Manitowoc ice machine cleaner, genuine OEM (part 000005162) — Use the cleaner your machine's manual specifies — generic acid descalers can strip a nickel-plated evaporator.
- Manitowoc ice machine sanitizer, genuine OEM (part 000005164) — Use the sanitizer your manual specifies, as a separate step after cleaning. Never mix cleaner and sanitizer.
- Manitowoc Arctic Pure replacement filter cartridges — Match the cartridge part number printed on your existing filter housing — cartridges are not interchangeable between systems.
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E01: Long freeze cycle
Freeze time hit the maximum limit; repeated over-long freeze cycles in a row shut the machine down. Scale on the evaporator, dirty condenser, or water supply problems are the usual causes.
What's usually behind it (causes and parts most often involved):
- Scale on the evaporator slowing ice formation
- A dirty condenser or blocked airflow
- Water supply problems: valve, pressure, filter
- Ice thickness probe dirty or out of adjustment
- Refrigerant or TXV problems — the technician tier
Often, yes — same story as on the newer NXT: E01 is a maintenance code first. A full clean-and-sanitize, a clean condenser, and verified water solve the majority of cases on these machines.
Diagnostic sequence — what to try, in order:
- Clean and sanitize the machine, especially the evaporator
- Clean the condenser
- Verify water supply, pressure (20-80 psi), and filter condition
- Check ice thickness probe cleanliness and adjustment
- Power cycle to reset and observe a cycle
Why it needs a technician: On an original Indigo now a decade or more old, an E01 that survives a genuine cleaning brings the sealed system into question — charge, TXV, or a tired compressor. Those diagnoses need gauges and EPA-certified hands, and on an older machine the quote deserves a side-by-side with replacement cost.
E02: Long harvest cycle
Harvest reached the 3.5-minute limit and the board returned to freeze; repeated consecutive long harvests stop the machine. Most often a dirty evaporator or ice thickness probe problem.
What's usually behind it (causes and parts most often involved):
- A scaled evaporator gripping the ice sheet at harvest
- A dirty or misadjusted ice thickness probe
- A warped or sticking water curtain, or missing magnet
- A weakening harvest valve
Usually, yes. Descale, clean the probe, verify the curtain swings free with its magnet in place. Most E02 events on these machines are years of scale talking.
Diagnostic sequence — what to try, in order:
- Clean and sanitize the machine with approved cleaner
- Clean the ice thickness probe and verify adjustment
- Check the water curtain swings freely and its magnet is intact
- Power cycle to reset
Why it needs a technician: Persistent long harvests after cleaning implicate the hot-gas valve or refrigeration circuit — instrument diagnosis on the sealed system, and on an aging Indigo, a finding worth pricing against the machine's remaining life.
E03: Input power loss
A power interruption to the machine was detected and logged in the event log.
What's usually behind it (causes and parts most often involved):
- A tripped breaker or blown fuse
- A building power interruption
- A loose supply connection
Yes — reset, restore, confirm a full cycle. The code is a logbook entry unless it repeats.
Diagnostic sequence — what to try, in order:
- Check and reset the dedicated breaker/fuse
- Verify the machine restarts and completes a cycle after power is restored
Why it needs a technician: Recurring power-loss events without a building outage mean circuit or connection trouble — electrician territory, and worth catching before a failing connection damages the control board.
E04: High condenser temperature
Liquid line/condenser temperature ran too high, typically from a dirty condenser or blocked airflow.
What's usually behind it (causes and parts most often involved):
- A grease-and-dust matted condenser coil
- Blocked airflow around the cabinet
- A hot equipment room
- A failing fan or fan control
Frequently — clean the coil, clear the clearance, check the room temperature, watch the fan run. This is the most fixable code on the list.
Diagnostic sequence — what to try, in order:
- Clean the condenser coil
- Clear airflow around the machine
- Confirm ambient temperature is within spec
- Power cycle and observe
Why it needs a technician: A clean, ventilated machine still running hot at the condenser has a fan motor, fan control, or refrigeration-side problem — live electrical and sealed-system work.
E05: High pressure cutout (HPC)
The high-pressure cutout opened 3 times within a 4-hour period, indicating sustained high head pressure — usually a dirty condenser or airflow/water supply restriction.
What's usually behind it (causes and parts most often involved):
- High head pressure from a dirty condenser — three trips in a four-hour window locks it out
- Airflow or water-supply restriction (water-cooled units)
- A refrigeration circuit fault
The cleaning tier, yes: condenser, airflow, water supply on water-cooled units. Then one reset, and honest observation.
Diagnostic sequence — what to try, in order:
- Clean the condenser
- Remove airflow obstructions
- On water-cooled units, verify condenser water supply
- Reset via the power button
Why it needs a technician: The high-pressure cutout tripping three times in four hours is the machine documenting a sustained problem, not a fluke. Past cleaning, the causes are all inside the pressurized system — certified-technician work, and pressure problems punished by repeated resets end in compressor failures.
E07: Starving TXV or low on charge
Evaporator conditions indicated a starving expansion valve or low refrigerant charge.
What's usually behind it (causes and parts most often involved):
- Low refrigerant charge (a leak, somewhere)
- A starving expansion valve
- Heat problems mimicking the condition
No — beyond cleaning the condenser to rule out the mimic and saving the event log. The diagnosis lives in the sealed system.
Diagnostic sequence — what to try, in order:
- Power cycle once and note whether the fault repeats
- Save the event log details for the technician
Why it needs a technician: Charge-versus-TXV is a gauges-and-superheat question, and a low charge means finding and fixing a leak before recharging — EPA-certified work start to finish. On a machine this age, ask the tech for the leak's location before authorizing: evaporator leaks on old machines often tip the repair-or-replace math.
E08: TXV fault
The control board detected an expansion valve malfunction.
What's usually behind it (causes and parts most often involved):
- A malfunctioning thermostatic expansion valve
- A transient reading (one power cycle rules it out)
No. One power cycle, save the log, book the call.
Diagnostic sequence — what to try, in order:
- Power cycle and note whether the fault repeats
- Record the event log for the service visit
Why it needs a technician: TXV replacement is a recover-braze-evacuate-recharge job on the sealed system — certified refrigeration work with no in-house version.
E09: #1 evaporator flooding
A flooding condition was detected on the number 1 (single-circuit) evaporator.
What's usually behind it (causes and parts most often involved):
- The #1 evaporator flooding — TXV overfeeding refrigerant
- A transient reading
No — one power cycle to confirm, then stop. Flooding conditions risk the compressor with every running hour.
Diagnostic sequence — what to try, in order:
- Power cycle and note whether the fault repeats
- Record the event log for the technician
Why it needs a technician: Liquid refrigerant migrating back to the compressor is the classic compressor-killer; the technician's gauges confirm the flooding and the valve correction before that bill arrives.
E10: #2 evaporator flooding
A flooding condition was detected on the number 2 evaporator circuit (dual-circuit machines).
What's usually behind it (causes and parts most often involved):
- The #2 evaporator circuit flooding on dual-circuit machines
- A transient reading
No. Same as E09 — confirm once, log it, call.
Diagnostic sequence — what to try, in order:
- Power cycle and note whether the fault repeats
- Record the event log for the technician
Why it needs a technician: Two valves and two circuits to isolate makes this strictly instrument work, with the same compressor-protection stakes as E09.
E11: Refrigeration fault
General refrigeration system fault — compressor discharge temperature did not reach/hold expected values.
What's usually behind it (causes and parts most often involved):
- Compressor discharge temperature outside expected values
- Cooling stress: dirty condenser, hot room
- A weakening compressor
The environment only: clean, ventilate, power-cycle once, save the log.
Diagnostic sequence — what to try, in order:
- Clean the condenser and verify ambient conditions
- Power cycle once and observe
- Save event log details for the technician
Why it needs a technician: Discharge temperature anomalies on an aging machine put the compressor itself in question — a diagnosis you want confirmed with gauges and amp readings before it drives a four-figure decision.
E12: Curtain switch fault
The water curtain switch stayed open (bin-full condition) for more than 12 hours on original Indigo machines.
What's usually behind it (causes and parts most often involved):
- Ice or objects holding the water curtain open past the 12-hour threshold
- A genuinely full bin
- A warped curtain or missing magnet
- A failed bin switch
Usually — clear the ice, free the curtain, verify the magnet, reset. Note the original Indigo trips this at 12 hours, half the newer NXT's threshold, so a busy weekend with a propped curtain can trigger it honestly.
Diagnostic sequence — what to try, in order:
- Clear ice or objects holding the water curtain open
- Check the curtain is installed, unwarped, and swings freely
- Verify the curtain magnet is present
- Reset with the power button
Why it needs a technician: A free, magnetized curtain with a persistent fault means the reed switch failed — a quick meter test and swap for a tech.
E13: Spare (reserved) code
E13 is a spare code on Indigo machines — reserved in firmware for future fault codes, along with E06, E14, E17 and E18. It has no assigned fault meaning.
What's usually behind it (causes and parts most often involved):
- E13 has no assigned fault — it is a spare code reserved in Indigo firmware (along with E06, E14, E17, E18) for future use
- If actually displayed: unusual firmware or a board anomaly
There is nothing defined to fix. Power-cycle once and record exactly what displayed, including any other codes in the event log.
Diagnostic sequence — what to try, in order:
- Power cycle the machine
- Record the exact code and any other codes in the event log
Why it needs a technician: A reserved code actually appearing on screen means the firmware or board is doing something undocumented — precisely the situation for a Manitowoc-authorized servicer with access to current service bulletins, not guesswork.
E15: Fan cycle control fault / low liquid line temperature
Liquid line temperature dropped below about 60°F, indicating a fan cycling control fault or very low ambient temperature.
What's usually behind it (causes and parts most often involved):
- A fan cycling control fault dropping liquid line temperature below ~60°F
- Installation in a too-cold location
The location check only: verify the machine and condenser are within rated temperature range.
Diagnostic sequence — what to try, in order:
- Verify the machine/condenser location is within rated temperature range
- Power cycle and observe
Why it needs a technician: Fan cycling and head-pressure controls are diagnosed by reading system pressures against ambient — sealed-system instrument work.
E16: Remote condenser fault
On remote-condenser units, liquid temperature read outside the 40-140°F range.
What's usually behind it (causes and parts most often involved):
- Remote condenser coils fouled with dirt or debris
- A failed remote condenser fan
- Outdoor temperature outside the 40-140°F window
The inspection and cleaning of the remote unit, where safely reachable. Many E16s are a rooftop coil full of cottonwood fluff.
Diagnostic sequence — what to try, in order:
- Check the remote condenser for dirt/debris and clean the coil surface
- Confirm the condenser fan operates
- Power cycle and recheck
Why it needs a technician: Beyond cleaning, remote condenser faults combine work at height, live electrical, and refrigeration controls — a service call three times over.
E19: Ice thickness probe fault
The ice thickness probe circuit failed — probe unplugged, scaled up, or defective.
What's usually behind it (causes and parts most often involved):
- Scale on the ice thickness probe
- An unplugged or corroded probe connection
- A failed probe
Very often — soak the probe in approved cleaner solution, rinse, dry completely, reconnect, and observe. Scale is the usual whole story.
Diagnostic sequence — what to try, in order:
- Confirm the probe is plugged into the control board
- Soak/clean the probe in approved ice machine cleaner solution, rinse and dry completely
- Power cycle and observe
Why it needs a technician: A clean, connected probe still faulting has failed electrically; confirming probe-versus-board is a meter test at the controller.
E20: Water system fault
The board detected a water system problem — supply, filter, inlet valve, pump, or water level probe.
What's usually behind it (causes and parts most often involved):
- Water supply: closed valve, low pressure, spent filter, clogged inlet screen
- Scale on the water level probe
- A failed pump or inlet valve
Often — restore water, replace the filter, clean the screen and probe. The majority of E20s are water problems, not machine problems.
Diagnostic sequence — what to try, in order:
- Verify the water supply is on and pressure is 20-80 psi
- Check/replace the water filter and clean the inlet valve screen
- Clean scale off the water level probe
- Power cycle after correcting
Why it needs a technician: With verified water and a persistent fault, the pump, valve, or probe circuit has failed — wet-environment electrical testing that belongs to a technician.
E25: Bin level probe low sensor fault
The bin level probe's low sensor returned invalid thermistor readings for 10+ minutes.
What's usually behind it (causes and parts most often involved):
- Scale or slime on the bin level probe's low sensor (10+ minutes of invalid readings)
- A loose cable
- A failed probe
Usually — clean the probe, reseat the cable, power-cycle.
Diagnostic sequence — what to try, in order:
- Clean the bin level probe
- Check its cable connection
- Power cycle the machine
Why it needs a technician: Persistent faults on a clean probe mean replacement, confirmed by a board-side test first.
E26: Bin level probe medium sensor fault
The bin level probe's medium sensor returned invalid readings for 10+ minutes.
What's usually behind it (causes and parts most often involved):
- Invalid readings from the bin probe's medium sensor for 10+ minutes
- Fouling on the probe
- A failed probe
Clean it, reseat it, power-cycle — the same drill as E25.
Diagnostic sequence — what to try, in order:
- Clean the bin level probe
- Check its cable connection
- Power cycle the machine
Why it needs a technician: Same as its siblings: a clean probe that keeps faulting is a test-and-replace item.
E27: Bin level probe high sensor fault
The bin level probe's high sensor returned invalid readings for 10+ minutes.
What's usually behind it (causes and parts most often involved):
- Invalid readings from the bin probe's high sensor for 10+ minutes
- Fouling or connection problems
- A failed probe
Clean, reseat, power-cycle. Bin probes forgive a lot of neglect once cleaned.
Diagnostic sequence — what to try, in order:
- Clean the bin level probe
- Check its cable connection
- Power cycle the machine
Why it needs a technician: If cleaning doesn't hold, the probe assembly needs professional testing and replacement.
E28: AuCS accessory fault
The AuCS automatic cleaning system accessory reported a fault.
What's usually behind it (causes and parts most often involved):
- The AuCS cleaning accessory disconnected or misinstalled
- An empty cleaner reservoir
- A failed AuCS unit
Check installation, fill the reservoir, power-cycle, re-run — the common causes are housekeeping.
Diagnostic sequence — what to try, in order:
- Check the AuCS unit is installed correctly and its cleaner reservoir is filled
- Verify its connection to the machine
- Power cycle and re-run
Why it needs a technician: A verified accessory that keeps faulting needs a Manitowoc-authorized look, both for the unit and because it doses chemicals into a food-contact machine.
E33: Keyboard fault
The keypad/keyboard interface on the Indigo display failed or stopped responding.
What's usually behind it (causes and parts most often involved):
- A failed or unresponsive keypad on the display assembly
- Loose display cabling
Power-cycle at the breaker and check the display cable connections. The machine may keep making ice regardless — verify at the bin.
Diagnostic sequence — what to try, in order:
- Power cycle the machine at the breaker
- Check the display/keypad cable connections
Why it needs a technician: A dead keypad after a reset means the display assembly needs replacement — a contained repair, but inside the panel.
E34: Display fault
The control board lost communication with the display assembly.
What's usually behind it (causes and parts most often involved):
- Lost communication between board and display
- A corroded ribbon cable — common in damp installs
- A failed display assembly
Inspect and reseat the ribbon cable with power off, then power-cycle. Visible green corrosion on the cable ends is your answer when you see it.
Diagnostic sequence — what to try, in order:
- Inspect the ribbon cable between display and control board for corrosion
- Reseat the cable
- Power cycle the machine
Why it needs a technician: If a clean reseat doesn't restore the display, it's an assembly replacement — quick for a tech, risky as a force-it job.
Related questions
How do I find my Manitowoc Indigo (original) code in this list?
Your machine shows one of 22 documented codes or signals. Use the table above — click your code to jump straight to its section.
Can I fix a Manitowoc Indigo (original) code myself?
Many of these 22 codes trace back to scale, dirty coolers, or a water-supply problem that in-house staff can address — each section above gives the documented first steps. Anything the page flags as refrigerant, compressor, or electrical-cabinet related needs a certified technician.
When does a Manitowoc Indigo (original) code need a technician?
Any code whose causes reach the sealed refrigeration system, the compressor, or the electrical cabinet needs a technician — those repairs require EPA Section 608 certification and diagnostic tooling most kitchens don't have. Each code section above says which side of that line it falls on.
Manufacturer source(s) verified for this page: Manufacturer document (manitowocice.com, p. 88), Manufacturer document (manitowocice.com, p. 89)
This page covers ice-making specifics only — the harvest cycle, water systems, and ice quality. For how a compressor works in general, see aircompressorcodes.com. For refrigeration-cycle and condenser fundamentals, see walkincoolercodes.com.