Service Manual

10
1. Operation Diagnosis
1) Startup Cycle: Turn on the power supply. Move the control switch to the "ICE" position.
"on" appears on CB display. HGV energizes and Comp/AMD 30-sec. delay timer starts.
Note: • CB display "on" LED remains on unless the 10.5VAC power supply to CB CN1 is
interrupted.
• Check CB using the steps in "II.C.Control Board Check."
• Conrm BC is CLOSED. If BC is open, remove ice from BC. If no ice is around
BC and icemaker does not start, see "II.D. Bin Control Check."
a) Startup Cycle Diagnosis: If CB "on" is off, conrm 5A fuse is good. Check for
115VAC at CS #2 (DBU) to neutral (W) then at CS #1(R) to neutral (W). If 115VAC
is present on #2 (DBU) and not on #1(R), replace CS. If 115VAC is present on
CS #1 (R), check for 115VAC at HPS (R) to neutral (W) then HPS (LBU) to neutral
(W). If115VAC is present at HPS (R) and not at HPS (LBU), HPS is open. See
HPS Diagnosis below. If115VAC is present at HPS (LBU), check for 10.5VAC at
CB CN1#1 red wire to CB CN1 #2 red wire. If10.5VAC is not present, check CT
continuity. If open, replace CT. If 10.5VAC is present and "on" is not on CB display,
replace CB.
b) HPS Diagnosis: Conrm condenser coil is not clogged or restricted. 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. Check that there are no restrictions in the refrigeration
circuit.
Harvest Cycle: HGV or strainer.
Freeze Cycle: FM, TXV, drier, and fan blade for binding.
Conrm that the location meets installation requirements. See the appliance's
instruction manual for details.