Service Manual
Table Of Contents
- Important Safety Information
- I. Construction and Water/Refrigeration Circuit Diagrams
- II. Sequence of Operation and Service Diagnosis
- III. Controls and Adjustments
- A. Control Board Layout
- B. LED Lights and Audible Alarm Safeties
- C. Controls and Adjustments
- 1. Default Dip Switch Settings
- 2. Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, 3)
- 3. Drain Frequency Control (S1 dip switch 4)
- 4. Continuous Dispensing Timer (S1 dip switch 5 & 6)
- 5. Bin Control Selector (S1 dip switch 7)
- 6. Bin Control Shutdown Delay, Agitation, and Ice Purge Timer (S1 dip switch 8)
- 7. Bin Control Shutdown Delay (S1 dip switch 9)
- 8. Factory Use (S1 Dip Switch 10)
- D. Switches
- IV. Refrigeration Circuit and Component Service Information
- V. Maintenance
- VI. Preparing the Appliance for Periods of Non-Use
- VII. Disposal
- VIII. Technical Information
14
2. Diagnostic Procedure
This diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation, proper voltage
per appliance nameplate, and adequate water supply (10 PSIG to 113 PSIG). Check that
both the 24VAC circuit fuse and the 115VAC GM fuse are good.
Note: • When checking high voltage (115VAC), always choose a neutral (W) wire to
establish a good neutral connection. IMPORTANT!Appliance will not start
unless the safety switch is engaged.
• When checking low voltage (24VAC), always choose a neutral (LBU) wire.
• When checking CB DC voltage (5VDC), always place the red test lead from the
multimeter to CB K4 pin #1 (pin closest to CB K3 connector).
See "II.C. Control Board Check."
• To speed up the diagnostic process, the ice purge cycle may be bypassed by
pressing the "SERVICE" button on the control board after the gear motor starts.
WARNING! Risk of electric shock. Care should be taken not to touch live
terminals.
• If the icemaker is in alarm, see "III.B. LED Lights and Audible Alarm Safeties."
• FM and EH energize when "GM" LED turns on.
• CB monitors the following switches with 5VDC during the icemaking process:
Control Switch (CS), High-Pressure Switch (HPS), Float Switch (FS),
Compressor Control Relay (CCR), and Bin Control (mechanical). When 5VDC is
present across any of these switches, the switch is open.
1) Turn on the power supply. Remove the front panel. Move the power switch to the "ON"
position, replace the front panel in its correct position.
2) Move the control switch to the "OFF" position, pause momentarily, then move to the
"DRAIN" position. Allow the water system to drain for 5 minutes.
Note: a) A momentary pause in the "OFF" position is necessary to de-energize the
control board when moving the control switch between "ICE" and "DRAIN."
Otherwise there is a delay of several minutes before the new selection takes
effect.
b) If the control switch is left in the "DRAIN" position for 10 minutes or more, a
2-beep alarm sounds every 5 seconds. Move the control switch out of the
"DRAIN" position to clear the alarm.
3) Remove the front panel, then move the power switch to the "OFF" position.
4) Remove the control box cover for access to the CB.
5) Check the CB S1 dip switch settings, see "III.C.1. Default Dip Switch Settings" to assure
that they are in the correct positions.
6) Engage the safety switch.