Service Manual

43
B. LED Lights and Audible Alarm Safeties
At startup, a 5-second delay occurs while the control board conducts an internal timer
check. A beep occurs when the control switch is moved to the "ICE" position. The red
"POWER OK" LED indicates proper control voltage and remains on unless a control
voltage problem occurs. The green LEDs 1 through 4 energize and sequence from initial
startup as listed in the table below. Note that the order of the LEDs from the outer edge
of the control board is 1, 4, 3, 2.
Sequence Step LED
Energized
Components
Time LEDs are On
Min. Max. Avg.
1-Minute Fill Cycle 4 WV 1 minute
Harvest Cycle 1, 4, 2 Comp, FMR,
HGV, WV
2 minutes 20 minutes 3 to 5 minutes
Harvest Pump Timer 1, 3, 2 Comp, FMR,
HGV, PM
0 seconds 50 seconds harvest pump timer
setting
Freeze Cycle 1 Comp, FM/
FMR, PM,
LLV
5 minutes freeze timer
setting
30 to 35 minutes
Pump-Out Cycle 1, 4*, 3, 2 Comp, DV,
FMR, HGV, PM,
SR, WV*
10 seconds 20 seconds *pump-out timer
setting
The built-in safeties shut down the icemaker and have alarms as listed below.
No. of Beeps
(every 3 sec.)
Type of Alarm Notes
1 High Evaporator Temp.
(temperature > 127°F) (53°C)
Check for harvest problem (stuck HGV or relay), hot
water entering icemaker, or shorted thermistor.
2 Harvest Backup Timer
(harvest > 20 min. for two
cycles in a row)
Check for open thermistor, HGV not opening, TXV or
LLV leaking by, low charge, or inefficient Comp, or WRV
leaking by.
3 Freeze Timer
(freeze > freeze timer setting
for two cycles in a row)
Check for FS stuck closed (up), WV leaking by, HGV
leaking by, PM not pumping, TXV not feeding properly,
LLV not opening, low charge, HM not bypassing, or
inefficient Comp.
To reset the above safeties, press the "ALARM RESET" button with the power supply on.
6 Low Voltage
(92Vac±5% or less)
Red LED turns off if voltage protection operates.
The control voltage safeties automatically reset when
voltage is corrected.
7 High Voltage
(147Vac±5% or more)
Legend: Comp–compressor; DV–drain valve; FM–fan motor; FMR–fan motor-remote;
FS–oat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); L LV –liquid line
valve; PM–pump motor; SR–service relay; TXV–thermostatic expansion valve;
WRV–water regulating valve; WV–inlet water valve