Service Manual

41
2. LED Lights and Audible Alarm Safeties
The "POWER OK" LED indicates proper control voltage and will remain on unless a
control voltage problem occurs. For further details, see "II.A. Sequence of Operation Flow
Chart."
Sequence Step LED
Energized
Components Min. Max.
Fill Cycle WTRIN WV - -
Ice Purge Cycle GM GM, FM/FMR 5 min. 5 min.
Freeze Cycle (with rell) GM, WTRIN* (rell),
COMP
GM, Comp,
FM/FMR, LLV,
SLV, WV* (rell)
- *On until UFS closes.
Alarm sounds after
90 sec.
Drain Cycle FLUSH (Drain) DV 2 sec. 10 min.
The built-in alarm safeties shut down the unit.
No. of Beeps
(every 5 sec.)
Type of Alarm Reset Options
1 Low Water Safety
UFS open > 90 sec. after WV energized.
Automatic reset once water supply is restored
and UFS closes.
2 Control Switch
In "DRAIN" position longer than 15 min..
Automatic reset once the control switch is
moved to the "ICE" position.
3 High-Pressure Switch
First and sec. activation in 1 hour.
Automatic reset once pressure drops below the
high pressure threshold and the high pressure
switch closes.
4 High-Pressure Switch
Third activation in 1 hour.
Call for service. To avoid possible catastrophic
failure, it is recommended to leave the
icemaker off until this alarm is resolved.
Manual reset. Turn power off and on again.
5 Freeze Timer
WV off > 30 min. since last WV activation.
Manual reset. Turn power off and on again.
6 Low Voltage
(92VAC±5% or less)
"POWER OK" LED turns off if voltage
protection operates.
The control voltage safeties automatically reset
when voltage is corrected.
7 High Voltage
(147VAC±5% or more)
8 Gear Motor
CCR contacts fail to close.
Manual reset. Turn power off and on again.
9 BC1 (infrared sensor) fails (CB S1 dip switch
7 on)
BC2 (mechanical backup) actuator paddle
engaged.
Manual reset. Turn power off and on again.
Legend: BC1–bin control (infrared sensor); BC2–bin control 2 (mechanical backup);
CB–control board; CCR–compressor control relay; Comp–compressor;
DV–drain valve; FM–fan motor; FMR–fan motor-remote; GM–gear motor;
LLV -liquid line valve (MLH model); SLV –suction line valve (MLH model);
UFS–upper oat switch; WV–inlet water valve
3. Ice Purge Cycle Bypass
To speed up the diagnostic process, the 5-min. 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.