Manitowoc IYT0900A Service Manual

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Part Number 000014141 Rev 07 2/20

Indigo NXT Ice Machines

Installation, Operation and Maintenance Manual

Original Document

,

Caution

Read this instruction before operating this equipment.

Engineered for Ease

Table of Contents

Questions and Answers:

S
Samantha AustinAug 12, 2025
Why is my Manitowoc IYT0900A Ice Maker not working?
- P
  pottsjosephAug 12, 2025
  If your Manitowoc Ice Maker isn't operating, several factors could be at play. First, ensure the unit is receiving electrical power by checking the fuse, resetting the breaker, or turning on the main switch. A tripped high-pressure cutout might also be the culprit, requiring you to clean the condenser coil. Confirm that Energy Saver settings or other custom programming aren't inadvertently halting the ice machine. Make sure the water curtain is correctly installed and swings freely. Verify the ice machine is powered on, with the display indicating “Making Ice”. For IB Models, check that the dispenser ice level thermostat is correctly adjusted.
X
xrayAug 16, 2025
Why is my Manitowoc IYT0900A Ice Maker not making ice?
- L
  Laura OlsenAug 16, 2025
  Your Manitowoc Ice Maker might not be operating due to several reasons: * There's no electrical power: Replace the fuse, reset the breaker, or turn on the main switch. * The high-pressure cutout is tripping: Clean the condenser coil. * Energy Saver mode is stopping the ice machine: Reset to factory defaults. * The water curtain is off or stuck open: Ensure the water curtain is installed and swinging freely. * The ice machine is not turned on: Press the power button; the display must indicate “Making Ice.” * For IB Models Only - The dispenser ice level thermostat is open: Adjust the thermostat to maintain the correct dispenser level.
R
rthomasAug 20, 2025
How to fix a Manitowoc Ice Maker that is not releasing ice?
- J
  jeremykellerAug 20, 2025
  If your Manitowoc Ice Maker is not releasing ice or is slow to harvest, several factors could be responsible. Start by descaling and sanitizing the ice machine, as it might be dirty. Ensure the ice machine is level. The air temperature around the ice machine head section must be at least 35°F (2°C). If the fan cycle control isn't de-energizing the condenser fan motor, call for service. Check if the water regulating valve is incorrectly adjusted or won't close; if water is present at the condenser drain outlet during the harvest cycle, contact a qualified service company to adjust or replace the valve.
S
Samuel ClarkAug 23, 2025
What to do if my Manitowoc IYT0900A Ice Maker produces poor quality ice?
- J
  John West MDAug 25, 2025
  If your Manitowoc Ice Maker is producing soft or unclear ice, it could be due to: * Poor incoming water quality. * Poor water filtration: Replace the filter. * The ice machine is dirty: De-scale and sanitize the ice machine. * The water dump valve is not working: Disassemble and de-scale the water dump valve. * The water softener is working improperly (if applicable): Repair the water softener.
K
Kathy PopeAug 27, 2025
Why is my Manitowoc Ice Maker producing shallow or incomplete cubes?
- M
  Marvin GutierrezAug 28, 2025
  If your Manitowoc Ice Maker is producing shallow or incomplete cubes, or the ice fill pattern on the evaporator is incomplete, consider the following: * The ice thickness probe is out of adjustment: Adjust the ice thickness probe. * The water trough level is too low: Check the water level probe position. * The water inlet valve filter screen is dirty: Remove the water inlet valve and de-scale the filter screen. * Poor water filtration: Replace the filter. * Hot incoming water: Connect the ice machine to a cold water supply. * The water inlet valve is not working: Replace the water inlet valve. * Incorrect incoming water pressure: Ensure water pressure is between 20 psi - 80 psi (140 kPa - 550 kPa). * The ice machine is not level: Level the ice machine.
J
James GalvanAug 31, 2025
How to fix low ice capacity in my Manitowoc IYT0900A?
- A
  Aaron Martinez DVMAug 31, 2025
  If your Manitowoc Ice Maker has a low ice capacity, check these possible causes: * The water inlet valve filter screen is dirty: Remove the water inlet valve and de-scale the filter screen. * The incoming water supply is shut off: Open the water service valve. * The water inlet valve is stuck open or leaking: Press the power button and turn off the ice machine; if water continues to enter the water trough, replace the water inlet valve. * The condenser is dirty: Clean the condenser. * High air temperature entering the condenser. * The harvest assist air compressor is not functioning.
G
gordonalexaSep 4, 2025
What to do if my Manitowoc Ice Maker does not release ice?
- C
  Crystal ValenzuelaSep 4, 2025
  If your Manitowoc Ice Maker is not releasing ice or is slow to harvest, consider these potential issues: * The ice machine is dirty: De-scale and sanitize the ice machine. * The ice machine is not level: Level the ice machine. * Low air temperature around the ice machine head section: Ensure the air temperature is at least 35°F (2°C). * Fan cycle control does not de-energize condenser fan motor. * The water regulating valve is incorrectly adjusted or will not close: Check for water at the condenser drain outlet in the harvest cycle. Contact a qualified service company to adjust/replace the valve if water is present.
J
Jeremy FletcherSep 8, 2025
Why won't my Manitowoc IYT0900A Ice Maker cycle into harvest mode?
- A
  Andrew LoweSep 8, 2025
  If your Manitowoc Ice Maker is not cycling into harvest mode, it might be due to: * The six-minute freeze time lock-in has not expired yet: Wait for the freeze lock-in to expire. * The ice thickness probe is dirty: De-scale and sanitize the ice machine. * The ice thickness probe is disconnected: Connect the probe to the control board. * The ice thickness probe is out of adjustment: Adjust the ice thickness probe. * Uneven ice fill (thin at the top of the evaporator): Verify sufficient water level in the sump trough. Contact a qualified service company to check the refrigeration system.

Manitowoc IYT0900A Specifications

General

Brand	Manitowoc
Model	IYT0900A
Category	Ice Maker
Language	English

Summary

Section 2 Installation

Location Requirements

Specifies criteria for selecting an appropriate installation location for the ice machine.

Installation Requirements

Details general prerequisites and conditions for a correct ice machine installation.

Bin Installation

Dispenser Installation

Electrical Requirements

Details electrical connections, grounding, and protection for safe operation.

Maximum Breaker Size & Minimum Circuit Amperage Chart

Table showing breaker sizes and circuit amperages for various models.

QuietQube Head Sections & CVD Condensing Units Electrical Data

Water Supply and Drain Line Sizing/Connections

Details water and drain line requirements and specifications for proper function.

Water Supply and Drain Connections

Drain Connections

Remote Condenser and Condensing Unit Refrigeration System Installation

Instructions for installing remote condenser and condensing unit refrigeration systems.

Remote Condenser Models

Calculating Installation Distances

Formulas and guidelines for determining optimal line set distances for refrigeration systems.

QuietQube Models Installation

Remote Ice Machine Usage with Non-Manitowoc Multi-Circuit Condensers

Guidelines for using non-Manitowoc condensers with Manitowoc ice machines.

Section 3 Operation

Touch Screen Features

Setup Wizard

Guides the user through initial ice machine programming and setup.

Menu Screen Navigation

Ice Making Sequence of Operation

Describes the step-by-step process of ice making, from water purge to harvest.

Minimum/Maximum Slab Weight

Ice Thickness Check

Section 4 Maintenance

Descaling and Sanitizing

General guidance on descaling and sanitizing procedures for efficient operation.

Remedial Cleaning Procedure

Detailed Descaling/Sanitizing Procedure

Comprehensive procedure for thorough descaling and sanitizing of the ice machine.

Sanitizing Procedure

Steps for sanitizing components and surfaces to ensure hygiene.

Parts Removal for Detailed Descaling and Sanitizing

Cleaning the Air Filter and Condenser

Section 5 Troubleshooting

Before Calling for Service Checklist

Checklist to diagnose common ice machine problems before contacting service.

Service Faults

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