Service Manual

21
IV. Service Diagnosis
WARNING
•Thisicemakershouldbediagnosedandrepairedonlybyqualiedservice
personnel to reduce the risk of death, electric shock, serious injury, or re.
•Riskofelectricshock.Useextremecautionandexercisesafeelectricalpractices.
•Movingparts(e.g.,fanblade)cancrushandcut.Keephandsclear.
•CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the icemaker is serviced. Make sure that none have fallen
into the storage bin.
•Makesureallfoodzonesintheicemakerandstoragebinarecleanafter
the icemaker is serviced. For cleaning procedures, see "VI. Cleaning and
Maintenance."
A. Ice Production Check
To check production, prepare a bucket or pan to catch the ice and a set of scales
to weigh the ice. After the icemaker has operated for 10 to 20 minutes, catch the ice
production for 10 minutes. Weigh the ice to establish the batch weight. Multiply the batch
weight by 144 for the total production in 24 hr.
B. 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, adequate
water pressure (10 to 113 PSIG), and proper voltage per unit nameplate. Check that
the 24VAC 1A fuse and the 10.5VAC 0.5A fuse are good. When checking high-voltage
(115VAC), always choose a neutral (W wire) to establish a good neutral connection.
When checking low-voltage (24VAC and 10.5VAC), always choose a neutral (LBUwire)
from CT to establish a good neutral connection. WARNING! LBU wires are used
in both high-voltage and low-voltage applications. When checking low-voltage
(24VAC and 10.5VAC) conrm that the neutral (LBU wire) being used is the LBU
wire from CT, not the 115VAC power LBU wire used for Comp/FM operation or the
24VAC LBU wire on the control switch to GMPR (DV operation).
When checking DC-voltage (5VDC), use CB K3 connector pin #1 for DC ground (GND).
CB "POWER" LED remains on unless power supply is interrupted. IMPORTANT!
Icemaker will not start unless the front panel safety switch is engaged.
1) Turn on the power supply. Remove the front panel. Move the power switch to the "ON"
position, then move the control switch to the "DRAIN" position. Engage the safety
switch.
2) Allow the water system to drain for 5 minutes. If water does not drain from the icemaker,
see step 12 Drain Cycle below.
3) Disengage the safety switch, then move the control switch to the "OFF" position.
4) Move the power switch to the "OFF" position.
5) Remove the control box cover.
6) Engage the safety switch.