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1. "E" and "G" Control Board without Harvest Pump Timer Diagnosis
3) Power On: Turn on the power supply, then move the control switch to the "ICE" position.
A 5-sec. delay occurs.
• "E" Control Board: CB red "POWER OK" LED turns on.
• "G" Control Board: CB red "POWER OK" LED and green "BC CLOSED" LEDturn on.
Note: • CB red "POWER" LED remains on unless the 10.5VAC power supply is
interrupted (K2 connector).
• Check CB using the steps in "II.C. Control Board Check."
• "G" CB: If yellow "BC OPEN" LED is on, check that CB red K4jumper is in place.
a) Power On Diagnosis: If CB red "POWER OK" LED is off, conrm closed BC and
10A fuse is good. If BC is open, remove ice from bulb and warm bulb in hand. IfBC
does not close, replace BC. See "II.D. Bin Control Check." Check for 115VAC at
control switch #1(BR) to neutral (W) then at control switch #2(P) to neutral (W).
If115VAC is present on control switch #1 (BR) and not on control switch #2(P),
replace control switch. If 115VAC is present on control switch #2 (P), check for
115VAC at HPS (P) to neutral (W), then HPS (BK) to neutral (W). If115VAC is present
at HPS (P) and not at HPS (BK), HPS is open. See HPS Diagnosis below. If115VAC
is present at HPS (BK), check for 10.5VAC at CB K2#1 (R) to CB K2#2(R).
If10.5VAC is not present, conrm that the cleaning valve interlock switch is closed.
Next, check CT continuity. Ifopen, replace CT.
b) HPS Diagnosis: Conrm FM is energized and fan blade turns freely. Conrm
condenser coil is not dirty. Conrm that the location meets installation requirements.
See the appliance's instruction manual for details. Conrm there are no restrictions in
the refrigeration circuit.
Harvest Cycle: HGV, strainer, or check valve.
Freeze Cycle: FM, FMR, TXV, HM, LLV, WRV, strainer, check valve, drier, damaged
line set or tting, and fan blade for binding.
Let refrigeration circuit pressures equalize. If HPS does not reset and pressures
are equalized, replace HPS. If pressures are not equalized, reclaim refrigerant and
diagnose refrigeration circuit restriction.
4) 1-Minute Fill Cycle – LED 4 is on.
WV energizes. After 1 min., CB checks for a closed
FS. If FS is closed, harvest cycle begins. If harvest cycle begins (Comp, HGV, and FMR
energize), continue to step 5. If FS is open, WV remains energized through additional
1-min. ll cycles until water enters the water tank and FS closes (low water safety
protection during initial start up and at the end of each harvest). Diagnosis: Check
that water enters the water tank. If not, check that the water supply line shut-off valve
is open and screens or external lters are clear. Check for 115VAC at CB K1 #6(O)
to neutral(W). If 115VAC is not present, replace CB. If 115VAC is present, and WV
does not energize, check for 115VAC at WV. If 115VAC is present, check coil continuity.
Ifopen, replace WV. If the water tank lls, but the appliance fails to start harvest (Comp
energized), check for open FS. See "II.E. Float Switch Check and Cleaning." If FS is
closed and CB fails to start the harvest cycle after 1 min., replace CB.