Manitowoc SN12 Specifications download pdf (Page 27)

Section 5 Before Calling For Service

Part Number 000005544 12/09 5-1

Section 5

Before Calling For Service

Checklist

If a problem arises during operation of your ice machine, follow the checklist below before calling for service. Routine

adjustments and maintenance procedures are not covered by the warranty.

Problem Possible Cause To Correct

Ice machine does not operate

Blue light on dispenser spout is

off

Blue light on dispenser spout is

No electrical power to the ice machine Reset the breaker/turn on main power switch/

plug cord into receptacle

ICE/OFF/CLEAN toggle switch set improperly Move toggle switch to the ICE position

Control Board fuse open Replace the fuse

15 minute delay has not expired Wait 15 minutes for ice machine to start

High Pressure Control is open Clean filter and condenser

Water reservoir is empty. (Water sensing

switch must be closed to start the gearmotor)

Open water service valve or clean float valve

screen

Gear Motor runs but

compressor will not start.

Dirty air filter and/or condenser causes the

high pressure cutout and compressor overload

to open

Clean air filter and condenser - Disconnect

power for minimum 4 hours then energize. If

problem persists contact a qualified service

company to determine cause.

Ice machine stops and can be

restarted by moving the toggle

switch to OFF and back to ICE

The SafeGuard feature is stopping the ice

machine

Refer to “SafeGuard Feature” in this section

Ice quality is poor Poor incoming water quality Contact a qualified service company to test the

quality of the incoming water and check filter

Water filtration is poor Replace filter

Incoming water temperature is above 90

°F

(32.3°C)

Correct water temperature. (Verify check/

mixing valves in other equipment are working

properly). Connect the ice machine to a cold

water supply

Water pressure is low Water pressure must remain between 20 and

80 psig

Water softener is working improperly (if

applicable)

Repair the water softener

Low ice capacity

Ice machine turns Off & On

repeatedly

Water float valve screen is dirty Remove and clean the filter screen

Incoming water supply is shut-off Open the water service valve

Water dump valve is leaking Clean the dump valve

Water Pressure is low. The water sensing

switch turns off the ice machine repeatedly

Water pressure must remain between 20 and

80 psig

Incoming water temperature is above 90

°F

(32.2

°C)

Correct water temperature. (verify check/

mixing valves in other equipment is working

properly)

Frequent power interruptions or power surges/

dips

Verify ice machine is on a separate circuit and

power is stable

Water float valve stuck open or leaking Remove the float valve and clean it

Objects stacked around ice machine, blocking

airflow to condenser

Remove items blocking airflow

High air temperature around ice machine Air temperature must not exceed 110

°F

(43.3

°C)

Inadequate clearance around the ice machine Provide adequate clearance

The condenser is dirty Clean the condenser

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Manitowoc SN12 Specifications Page 27

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