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The green LEDs 1-4 represent the corresponding relays and energize and sequence
5 seconds from initial startup as follows:
{LED 1 – Comp; LED 2 - HGV/CFM; LED 3 – PM; LED 4 - WV}
The built in safeties shut down the unit and have alarms as follows:
The Output Test switch “S3” provides a relay sequence test. With power OFF, place S3
ON and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, & 4,
normal sequence every 5 seconds. (The LEDs are not in numerical order on the board. See
the diagram on the next page for the location and numbering of LEDs). S3 should remain in
the “OFF” position for normal operation.
Min. Max. Avg.
1 Minute Fill Cycle
460 seconds
Harvest Cycle
1, 4, and 2 2 minutes 20 minutes 3 to 5 minutes
Freeze Cycle
1 5 minutes 60 minutes 30 to 35 minutes
Reverse Pump Out
1, 3, and 2 10 seconds 20 seconds factory setting
Time LEDs are Lit
LEDSequence Step
No. of Beeps
(every 3 sec.)
Type of Alarm Notes
1 High Evaporator Temp.
(temperature > 127°F)
Check for defrost problem (stuck HGV or relay),
hot water entering unit, stuck headmaster, or
shorted thermistor.
2 Defrost Backup Timer
(defrost > 20 min.)
Orange LED marked 20 MIN lights up.
Check for open thermistor, HGV not opening, TXV
leaking by, low charge, or inefficient compressor.
3 Freeze Backup Timer
(freeze > 60 min.)
Yellow LED marked 60 MIN lights up.
Check for F/S stuck closed (up), WV leaking by,
HGV leaking by, TXV not feeding properly, low
charge, or inefficient compressor.
4 Short Circuit
(between the K4 connection
on the control board and the
bin control relay)
Check connections and replace wire harness if
necessary.
5 Open Circuit
(between the K4 connection
on the control board and the
bin control relay)
Check connections and replace wire harness if
necessary.
6Low Voltage
(92Vac or less)
7 High Voltage
(control voltage
> 147Vac ±5%)
Red LED will turn off if voltage protection
operates.
The voltage safety automatically resets when
voltage is corrected.
To manually reset the above safeties, press the white alarm reset button with the power supply on.