Ice-O-Matic GEM0655 Air, GEM1256A/W Control System Diagnostics, High pressure cut out check, Page

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Control System Diagnostics

GEM0650/0956/1256 A/W

Control System Diagnostics

The Control System consists of: ●Control Board

●Water Sensors

●Ice Sensors

●High Pressure Cut Out

●Low Pressure Cut Out

If the unit is OFF, check the control board:

1.Is the Power OK light on? If not check power to the unit. If it has power, and the Power OK light is not on, check the high pressure and low pressure cut outs. If they are both closed, replace the board. If the POWER OK light is ON, go to the next step.

2.Is the Water OK light on? If it is, go to the next step. If not, check the water level in the reservoir. If there is water in the reservoir, check that the water sensor is plugged in. To check the water sensor:

a.Unplug the water sensor.

b.Pull the water sensor from the reservoir.

c.Place one ohmmeter lead on the sensor’s plug and the other on the sensor’s tip. The meter should show nearly zero (0) resistance. If it reads infinite resistance, check the tip for corrosion. If it is clean and still reads open, replace the sensor.

OR, connect a copper wire to the wire where the water sensor plugs into and place the other end in the water. The WATER OK should go ON. If it does not, replace the board.

3.Ice sensor Check. Is the BIN FULL light OFF? If it is OFF and the SERVICE light is OFF and the unit is not running, replace the control board.

a.If it is OFF and the auger motor is running but the compressor is not, check the compressor contactor coil.

b.If it is ON, the ice sensors may be blocked. Remove them and check for mineral scale.

4.High pressure cut out check.

a. Disconnect electrical power.

b. Pull the wires off the high pressure cut out.

c. Use an ohmmeter to determine if the switch is OPEN. If it is, check the discharge pressure. If the discharge pressure is less than 300 PSIG, replace the high pressure cut out.

d. If the high pressure cut out is open and the system has high discharge pressure, check for the cause.

5.Low pressure cut out check.

a.Disconnect electrical power.

b.Pull the wires off the low pressure cut out.

c.Use an ohmmeter to determine if the switch is OPEN. If it is, check the suction pressure. If the suction

pressure is greater than 20 PSIG, replace the low pressure cut out.

d. If the low pressure cut out is open and the system has low suction pressure, check for the cause.

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Contents SERVICE AND INSTALLATION MANUAL GEM0650A/W,GEM0956A/W and GEM1256A/WGEM0655 Air Page Keep this manual for future reference GEM0650/0956/1256 A/WForward PageTable Of Contents Table of ContentsVisible Loss or Damage Freight Claim ProcedureInspect Promptly Concealed Loss or DamageLimitation of Warranty WarrantyICE-O-Matic Filing a ClaimElectrical Specifications For the InstallerInstallation Guidelines AdjustmentsFor The Installer GEM0650/0655/0956A/WGEM1256A/W Ice Machine Specifications Bin ApplicationIce machine LocationStorage Bin Water LimitationsGEM 0650/0956/1256 A/W WATER COOLED MODELS For the PlumberWater Inlet AIR COOLED MODELSWater Cooled Models For the ElectricianElectrical Connections Air Cooled ModelsGEM0650/0956/1256A/W Final Check ListStart Up Pre-StartInspectionStart Up Component Description Air Cooled Model ShownGEM0650/0956/1256 A/W Component Description Ice Sweep Bearing Breaker/Divider Auger Evaporator Motor Water SealElectrical Sequence To ResetElectrical Sequence Shut DownOperation Water Water SystemOperation: Performance High Pressure Cut Out- Automatic ResetLow Pressure Cut Out- Automatic Reset Typical Low Side Pressurescheduled at a minimum of twice a year Sanitizing and CleaningICE MAKING SYSTEM: In place cleaning KEEP OUT OF THE REACH OF CHILDRENBearing Maintenance Bearing MaintenanceNote Left Hand Threads Sensor Maintenance Bin Control SensorWater Sensor GEM0956 Maintenance Air CooledClean the air cooled condenser GEM0650Auger Auger Maintenance1. Disconnect electrical power to the ice machine 2. Turn off the water supply to the ice machinePossible Cause Service DiagnosisSymptom Probable CorrectionGEM0650/0956/1256 A/W Control System Diagnostics 4.High pressure cut out checkR&R- Water Reservoir, Bin Control Water ReservoirBin Controls Ice Level Sensors To Remove the Breaker Bearing Assembly R&R-Bearingand BreakerR&R-Auger To Remove the AugerRemoval of the Water Seal R&R-WaterSealTo Remove the Water Seal To Replace the Water SealR&R-Evaporator To Replace the EvaporatorTo Reassemble the Evaporator and Auger To Check the Gear Motor To Remove and Repair the Gear Motor AssemblyR&R-GearMotor To Inspect the Gear MotorR&R-FanBlade and Motor Refrigeration Service Instructions for Liquid Charging R404AGEM0650 Wiring Diagram Wiring Diagram GEM0650 A/WGEM0956 Wiring Diagram Wiring Diagram GEM0956 A/WGEM1256 Wiring Diagram Wiring Diagram GEM1256 A/WGEM0655 Wiring Diagram Wiring Diagram GEM0655 AirService History What to Do Before Calling for Service
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