2B. Diagnostic Procedure Auxiliary Code C-1 And Later - Hoshizaki F-330BAH Service Manual

2b. Diagnostic Procedure Auxiliary Code C-1 and Later

This diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation, adequate
water supply (minimum of 10 PSIG, maximum of 113 PSIG), and proper voltage per
appliance nameplate. Check that the 24VAC 1A fuse is good and GM external protector
is closed. When checking for high-voltage (115VAC), always choose a white (W) neutral
wire to establish a good neutral connection. When checking for low-voltage (secondary)
(24VAC), always choose a light blue (LBU) neutral wire to establish a good neutral
connection.
Note: • DV energizes when BC opens.
• On -C model, EH energizes when X12 relay energizes.
1) Confirm the appliance is plugged into the electrical outlet, supply voltage is correct per
nameplate.
2) Remove the front panel.
3) Confirm the power switch is in the "ON" position, then move the control switch to the
"DRAIN" position. DV Diagnosis: If DV does not energize, check for 24VAC at HPS
red (R) wire to neutral (LBU) and HPS white/red (W/R) wire to neutral (LBU). If 24VAC
is not present on HPS red (R) wire to neutral (W), check CT continuity. Replace if open.
If 24VAC is present on HPS red (R) wire and not on HPS white/red (W/R) wire, HPS
is open. If 24VAC is present at HPS white/red (W/R) and DV does not energize, check
for 24VAC at X12 relay terminal #1 (V). If 24VAC is not present, X12 relay is energized
or contacts are sticking. Replace as needed. If 24VAC is present, check for 24VAC at
X10 relay #6 (W/BK). If 24VAC is not present, X10 relay is energized or contacts are
sticking. Replace as needed. If 24VAC is present, check DV coil continuity. If open,
replace DV.
HPS Diagnosis: Check that the condenser air filter and coil are not clogged or
restricted. Check that there are no restrictions in the refrigeration circuit (capillary
tube or drier). 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.
4) Startup/Fill Cycle–Move any ice away from the BC actuator paddle (located at the top
of the bin). Move the control switch to the "ICE" position. X10 relay and WV energize.
Reservoir fills, LFS closes, nothing happens at this time. The reservoir continues to fill.
X10 Relay Diagnosis: Check that WV energizes and fills the reservoir. If not, confirm
BC is closed. See "II.D. Bin Control Check." Confirm control switch is in the "ICE"
position and switch is closed. Next, check for 24VAC at X10 relay #7 (V) to X10 relay
#8 (LBU). If 24VAC is present, check for 24VAC at X10 relay #5 (R) to neutral (LBU).
Next, check for 24VAC at X10 relay #3 (R) to neutral (LBU). If 24VAC is present at
#5 (R) and not at #3 (R), replace X10 relay. If 24VAC is present on X10 relay #3 (R),
check X11 relay. X11 Relay Diagnosis: Check for 24VAC at X11 relay #5 (R) to neutral
(LBU). Next, check for 24VAC at X11 relay #1 (O) to neutral (LBU). If 24VAC is present
at X11 relay #5 (R) and not at #1 (O), confirm X11 relay is de-energized. If X11 relay
is energized, check for sticking UFS. See "II.E. Float Switch Check and Cleaning."
If X11 relay is de-energized, replace X11 relay. WV Diagnosis: If 24VAC is present on
X11 relay #1 (O), check WV coil continuity. If open, replace WV.
15