Manitowoc SN12 Specifications download pdf (Page 28)

Before Calling For Service Section 5

5-2

Part Number 000005544 12/09

Safeguard Feature

In addition to standard safety controls, your Manitowoc ice machine features built-in SafeGuards. The ice machine will

stop when conditions arise that would cause major component failure.

GENERAL

The ice machine control board has safety features to

protect the ice machine from severe failures. The ice

machine will stop when conditions arise that would

cause major component failure.

A control board light will flash to indicate which

Safeguard has stopped the ice machine.

Safeguards can be viewed by placing the ICE/OFF/

CLEAN toggle switch in the OFF position.

After 48 hours a Safeguard is automatically erased.

DETERMINING WHICH SAFEGUARD STOPPED THE

ICE MACHINE

Move the ICE/OFF/CLEAN toggle switch to OFF.

If a safeguard has stopped the ice machine, the light

which corresponds to the failure will flash.

SAFEGUARD INDICATOR LIGHTS

During a SafeGuard Mode the corresponding light will

flash continuously.

Example; the “water ok” light on the control board

flashes when the toggle switch is placed in the Off

position. This indicates a loss of water in the reservoir or

a failure of the water sensing switch.

The SafeGuard will remain in memory for 48 hours after

the control is reset with the toggle switch. After 48 hours

the SafeGuard will automatically be erased. If power is

interrupted during the 48 hours, the timing will resume

when power is applied to the ice machine.

Placing the toggle switch in the OFF position:

The corresponding light will flash continuously.

Placing the toggle switch in the ICE position:

The light will de-energize and a start-up sequence will

initiate.

During the first 48 hours after the control board was

reset, the corresponding light will flash anytime the

toggle switch is placed in the OFF position.

SafeGuards

1. No Water - The water sensor switch opens for more

than 20 seconds during the freeze cycle.

2. No Ice Production - The damper door (HES1) fails to

open and close at least once during the first 8

minutes of compressor run time.

The damper door fails to open and close at least

once every 90 seconds during the freeze cycle.

RESET PROCEDURE

1. Move the ICE/OFF/CLEAN toggle switch to OFF

and then back to ICE.

A. If a safeguard feature has stopped the ice

machine, it will restart after a short delay.

Proceed to step 2.

B. If the ice machine does not restart, refer to “Ice

Machine Does Not Operate” in section 5.

2. Allow the ice machine to run to determine if the

problem still exists.

A. If the ice machine continues to run, the condition

has corrected itself. Allow the ice machine to

continue running.

B. If the ice machine stops again, the problem still

exists.

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Manitowoc SN12 Specifications Page 28

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