Hoshizaki DCM 300BAH(-OS) service manual

9)Ice Purge Cycle – "GM" LED is on. GM and GMPR energize. 60-sec. ice purge timer starts. GM runs for 60 sec. to clear any ice from the evaporator. Note: GM cannot energize unless UF/S is closed, WCR is energized, and WCR terminals #4 (O wire) and #6 (GY wire) are closed. Diagnosis: If "GM" LED is off, check control switch and BC continuity. If either are open, CB "GM" LED will not turn on. If both are closed and CB "GM" LED does not turn on, replace CB. If "GM" LED turns on and GM does not energize, check for 115VAC at CB K1 connector NO pin (DBU wire) to a neutral (W wire). If 115VAC is not present, replace CB. If 115VAC is present, check GM external protector (overload), GM windings continuity, and GM capacitor. If GM external protector or GM internal protector is open, allow to cool and reset. If reset does not occur, replace as needed. If GM winding is open, replace GM. If GM energizes, but auger does not turn, check coupling between auger and GM. If Comp energizes at the same time GM energizes, check CB. See "IV.C. Control Board Check."

10)Freeze Cycle – "COMP" and "GM" LEDs are on. 60-sec. ice purge timer terminates. GM continues. CB confirms GM operation through GMPR terminal #3 (BR wire) and terminal #5 (DBU wire). Comp and FM energize. Ice production begins 4 to 6 min. after Comp and FM energize depending on ambient and water temperature conditions. Diagnosis: 60 sec. after GM energizes, confirm Comp LED turns on and Comp and FM energize. If not, check that GMPR is energized (115VAC). Next, check continuity between GMPR terminal #3 (BR wire) and terminal #5 (DBU wire). If open, GMPR

is de‑energized or contacts are stuck open. If closed, and "COMP" LED, Comp, and FM do not energize, replace CB. If "COMP" LED turns on and Comp and FM do not energize, confirm 115VAC at CB X2 relay (BR wire) to a neutral (W wire). If 115VAC is not present, check connections. If 115VAC is present, confirm 115VAC at CB X2 relay light blue (LBU wire) to a neutral (W wire). If 115VAC is not present and "COMP" LED is on, replace CB. If 115VAC is present, check Comp external protector (overload), allow to cool and reset. If reset does not occur, replace as needed. Check Comp motor windings continuity and Comp capacitor. Check FM for binding and FM winding continuity.

11)Refill /Low Water Safety – As ice is produced the water level in the reservoir drops. UF/S opens. Nothing happens at this time. LF/S opens. FT starts. WCR de‑energizes, energizing WV. Comp, FM and GM continue. As water fills the reservoir, LF/S closes. Nothing happens at this time. UF/S closes. FT terminates. WCR energizes, closing low water safety circuit and de‑energizing WV. This continues until BC shuts the icemaker down, a drain cycle occurs, or power is turned off to the icemaker. Diagnosis: Confirm that the water level has dropped and UF/S and LF/S are open. See "IV.E. Float Switch Check and Cleaning." Check that the reservoir fills. If not, check for water supply line shut-off valve closed, clogged water filters, dirty or sticking F/S, clogged WV screen, defective WCR, defective WV coil, and DV leaking by. For further information, see "IV.B.8) Fill Cycle." If UF/S remains open longer than 90 sec. after LF/S opens (FT exceeded), Comp and FM de‑energize. GM de‑energizes 60 sec. later. WV continues until UF/S closes.

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