Hoshizaki KM-201BAH Service Manual page 20

seconds and the icemaker automatically stops. The control board will signal this problem
using 7 beeps every 3 seconds.
The icemaker also automatically stops in cases of insuffi cient voltage (92Vac ± 5% or
less). The control board will signal this problem using 6 beeps every 3 seconds.
When the proper supply voltage is resumed, the icemaker automatically starts running
again.
f) LED Lights and Audible Alarm Safeties
The control board includes LED indicator lights, audible alarm safeties, and an output
test feature. The "POWER OK" LED indicates control voltage and will remain on unless
a control voltage problem occurs. The "POWER OK" LED fl ashes continuously when the
bin is full and DV energizes for a maximum of 5 minutes to drain the water tank.
At startup, a 5 second delay occurs to stabilize the circuit. LEDs 4 through 8 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 board is 5, 6, 8, 9, 4, 7. For more information, see "2.
SEQUENCE OF OPERATION".
Sequence Step
1 Minute Fill Cycle
Harvest Cycle
Last 0, 10, 30, or 50 seconds (adjustable by dip switch) of harvest, WV de-energizes
and PM energizes (LEDs 5, 6, and 7 are on)
Freeze Cycle
Pump-Out Cycle
The built in safeties shut down the unit and have alarms as listed below.
No. of Beeps
(every 3 sec.)
High Evaporator Temp.
1 (temperature > 127°F (53°C))
Harvest Backup Timer
2 (harvest > 20 min. for two
cycles in a row)
Freeze Timer
(freeze > specifi ed setting for
3 two cycles in a row)
Timer is factory set using S1
dip switch 9 & 10
To reset the above safeties, press the "ALARM RESET" button with the power supply
on.
Energized
LED
Components
8 WV
WV, HGV,
5, 6, 8
Comp
Comp, PM,
5, 7
FMS
Comp, HGV,
5, 6, 4, 7
DV, PM
Type of Alarm
Time LEDs are On
Min. Max.
2 minutes 20 minutes 3 to 5 minutes
freeze timer
5 minutes
setting
10 seconds 20 seconds
Check for harvest problem (stuck HGV or
relay), hot water entering unit, stuck HM, or
shorted thermistor.
Check for open thermistor, HGV not
opening, TXV leaking by, low charge,
ineffi cient Comp, or WRV leaking by.
Check for a fl oat switch stuck closed (up),
WV leaking by, HGV leaking by, PM not
pumping, TXV not feeding properly, low
charge, or ineffi cient Comp.
15
Avg.
60 seconds
25 to 30 minutes
factory default
setting
Notes