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12) Drain Cycle – "FLUSH" (drain) LED is on. The icemaker drains the evaporator and
reservoir once every 12 hr. A manual drain is provided when cleaning the icemaker by
moving the control switch from the "ICE" position to the "DRAIN" position.
a) Automatic Drain Cycle: A drain cycle occurs once every 12 hr. for 20min.
DCTterminates and DVT starts. If the icemaker is not running when DCT terminates,
DV energizes immediately. If the icemaker is running when DCT terminates, Comp
and FM de-energize. GMde-energizes 60 sec. later, then DVenergizes. Once
DVT terminates, DCTresets and DV de-energizes. Fill cycle starts. DCT resets
every time the power supply is turned off and on again. Diagnosis: Once GM
de-energizes, DV energizes. If not, check for 24VAC at the control switch (LBU wire)
to a neutral (LBUwire). If 24VAC is not present, replace CB. If 24VAC is present,
check for 24VAC at GMPR terminal #2(P wire) to a neutral (LBU wire). If 24VAC is
not present, GMPR is energized or defective. If GMPR is energized, conrm GM is
off. If not, DCT has not terminated or 60-sec. shutdown sequence is not complete.
If 60-sec. shutdown is complete and GM is still energized, replace CB. If 24VAC is
present, check for 24VAC on DV. If 24VAC is present and DV does not energize,
check DV solenoid continuity.
b1) Manual Drain: 150-sec. shutdown sequence: Move the control switch to the
"DRAIN" position. The 150-sec. shutdown sequence starts. 90 sec. after moving
the control switch to the "DRAIN" position, Comp and FM de-energize, 60 sec.
later GM de-energizes and DV energizes. DV continues until the control switch is
moved to the "OFF" or "ICE" position or power is turned off. Diagnosis: Once GM
de-energizes, DV energizes. If not, check for 24VAC at CBK3connector pin #3(DBU
wire) to a neutral (LBU wire). If 24VAC is not present, conrm 24VAC power supply
to CB K2connector pin #7(Rwire) on push button model and pin #9(Rwire) on
Opti-Serve model to a neutral (LBU wire). If 24VAC is present on CB K2 pin #7(push
button model) or pin #9 (Opti-Serve model) and not on CB K3 connector pin #3(DBU
wire), replace CB. If 24VAC is present at CB K3 connector pin #3 (DBU wire), check
for 24VAC at control switch (LBU wire) to a neutral (LBU wire). If 24VAC is not
present, check continuity of the control switch. Replace the control switch if defective.
If24VAC is not present, GMPR is energized or defective. If 24VAC is present, check
for 24VAC at GMPR terminal #2 (P wire) to a neutral (LBU wire). If 24VAC is not
present, check GMPR continuity between terminals #2 (P wire) and #6 (LBU wire). If
open, replace GMPR. Next, check for 24VAC at DV. If 24VAC is present and DV does
not energize, check DV solenoid continuity.
b2) Manual Drain: 150-sec. shutdown sequence bypass: To bypass the 150-sec.
shutdown sequence, remove the front panel, then move the power switch to the
"OFF" position. Next, move the control switch to the "DRAIN" position, then move
the power switch to the "ON" position. DV energizes. IMPORTANT! Drain valve
will not energize unless the front panel safety switch is engaged.
Diagnosis: If DV does not energize, check for 24VAC at CBK3connector pin
#3(DBU wire) to a neutral (LBU wire). If 24VAC is not present, conrm 24VAC power
supply to CB K2 connector pin #7(Rwire) on push button model and pin #9(Rwire)
on Opti-Serve model to a neutral (LBU wire). If 24VAC is present at CB K2 pin
#7(push button model) or pin #9 (Opti-Serve model) and not on CB K3 connector
pin #3 (DBU wire), replace CB. If 24VAC is present at CB K3 connector pin #3 (DBU
wire), check for 24VAC at control switch (LBU wire) to a neutral (LBU wire). If 24VAC
is not present, check continuity of the control switch. Replace the control switch