3) Fill Cycle–"WTRIN" LED is on: "WTRIN" LED turns on only when the reservoir water level is low enough to open LFS. Diagnosis: Confirm LFS is open. If "WTRIN" LED is off and LFS is open and the control switch is in the "ICE" position (open), replace CB. If "WTRIN" LED is on and water is not filling the reservoir, check for 24VAC at CB K2 connector between pin #8 (W/BR) and a neutral (LBU). If the "WTRIN" LED is on and 24VAC is not present between CB K2 connector pin # 8 (W/BR) and neutral (LBU), confirm 24VAC at CB K2 connector between pin #7 (W/R) and a neutral (LBU). If 24VAC is present between CB K2 connector pin #7 (W/R) and a neutral (LBU) and not between CB K2 connector pin #8 (W/BR) and a neutral (LBU), replace CB.
24VAC CB K2 Connector
| | | | | | LFS | LFS |
| Connector | Pin # (Wire Color) | To | Neutral (LBU) | Open | Closed |
| K2 | (CB input power) | Pin #7 (W/R) | | K8 pin #2 (LBU) | 24VAC | 24VAC |
| K2 | (WV power) | Pin #8 (W/BR) | To | 0VAC | 24VAC |
| |
4) Ice Purge Cycle–"GM" LED is on: "GM" LED turns on once UFS closes (reservoir full). If UFS is closed and "GM" LED is off, replace CB. If "GM" LED is on but GM does not start, check for 115VAC from CB K1 connector pin #3 (DBU) to a neutral (W).
If 115VAC is not present, confirm 115VAC from CB K1 connector pin #2 (BR) to a neutral (W). If 115VAC is present on CB K1 connector pin #2 (BR) but not on CB K1 connector pin #3 (DBU), replace CB.
5) Freeze Cycle–"GM" and "COMP" LED are on: 5-minute ice purge timer terminates or press the "SERVICE" button on CB after the "GM" LED turns on to bypass ice purge cycle. WARNING! Risk of electric shock. Care should be taken not to touch live terminals. After 5-minute ice purge timer terminates, "COMP" LED turns on. If not, replace CB. If "COMP" LED turns on and Comp does not start, check for 115VAC from the CB X1 relay (BR) and (R) to a neutral (W). If 115VAC is present on CB X1 relay (BR) and not on CB X1 relay (R), replace CB.
Legend: AM–agitating motor; BC–bin control; CB–control board; Comp–compressor; CT–control transformer; DCT–drain cycle timer (1-hr.); DV–drain valve; DVT–drain valve timer (2-sec.); FM–fan motor; FT–fill timer (90‑sec. low water safety); GM–gear motor; GMPR–gear motor protect relay; IPT–ice purge timer; LFS–lower float switch; UFS–upper float switch; WV–inlet water valve