Hoshizaki F-500BAJ Service Manual page 17

10) Refill Cycle – "GM", "COMP", and "WTRIN" LEDs are on.
LFS opens. WV energizes and 90-sec. FT starts. Comp, GM, CCR, and FM continue.
LFS closes. Nothing occurs at this time. Reservoir continues to fill until UFS closes.
When UFS closes, WV de-energizes, 90-sec. FT terminates, and 30-min. FZT starts.
If UFS remains open longer than 90 sec. after LFS opens, FT exceeded and CB sounds
a 1-beep alarm. WV remains energized until UFS closes. Alarm resets automatically
when UFS closes.
Diagnosis – Confirm that the water level has dropped and the UFS and LFS are open.
See "II.E. Float Switch Check and Cleaning." Check that "WTRIN" LED is on. If LFS
is open and "WTRIN" LED is off, replace CB. If "WTRIN" LED is on, check that the
reservoir fills. If not, check water supply line shut-off valve, water filters, and WV screen.
If "WTRIN" LED is on and WV is off, check CB K2 #8 (O) to a neutral (LBU) for 24VAC.
If 24VAC is not present, check CB K2 #9 (W/R) to a neutral (LBU) for 24VAC. If 24VAC
is present on CB K2 #9 (W/R) and not on CB K2 #8 (O), replace CB. If 24VAC is
present on CB K2 #8 (O), check continuity through WV solenoid. If open, replace WV.
If WV is energized and refill exceeds FT with no water in the reservoir, check for DV
leaking. If reservoir is full and overflowing check for open UFS. See "II.E. Float Switch
Check and Cleaning." If UFS is closed, check that WV de energizes. If not, check
CB K2 #8 (O) to a neutral (LBU) for 24VAC. If 24VAC is present, replace CB. If WV
de-energizes and water continues to fill the reservoir, replace WV.
Note: Each time UFS closes, 30-min. freeze timer starts. The 30-min. freeze timer
resets when UFS closes again. If UFS does not close again within 30 min., CB
shuts down the unit and sounds a 5-beep alarm every 5 sec.
See "III.A.2 LED Lights and Audible Alarm Safeties."
FT: 90-Sec. Low Water Safety Timer – When LFS opens, 90-sec. low water safety
timer starts. If UFS does not close within 90 sec. after LFS opens (FT exceeded),
CB sounds a 1-beep alarm and a 90-sec. shutdown cycle starts
See "III.A.2. LED Lights and Audible Alarm Safeties." Comp and FM de-energize. GM
and CCR continue. 90-sec. purge timer terminates, GM and CCR de-energize. WV and
1-beep alarm continue until UFS closes.
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