Hoshizaki F330BAH, F330BAHC Service Manual

Hoshizaki America, Inc.

Hoshizaki

Self-Contained Flaker

Models
F-330BAH(-C)

“A Superior Degree

of Reliability”

www.hoshizaki.com

SERVICE MANUAL

Number:
Issued: 8-2-2007
Revised: 4-22-2013

73151

WARNING

Only qualied service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.

Hoshizaki provides this manual primarily to assist qualied service technicians in the
service of the appliance.

Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.

Phone: [phone]
Fax: [phone]

E-mail: [e-mail]

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

2

IMPORTANT

This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this manual carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this manual for any further reference that may be necessary.

CONTENTS

Important Safety Information ................................................................................................. 5

I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 7

A. Construction .................................................................................................................. 7

1a. F-330BAH(-C) Auxiliary Code C-0 and Earlier ....................................................... 7

1b. F-330BAH(-C) Auxiliary Code C-1 and Later ......................................................... 8

B. Ice Making Appliance .................................................................................................... 9

C. Water/Refrigeration Circuit Diagram ............................................................................ 10

II. Sequence of Operation and Service Diagnosis ................................................................ 11

A. Sequence of Operation Flow Chart ..............................................................................11

B. Service Diagnosis ....................................................................................................... 12

1. Ice Production Check ............................................................................................. 12

2a. Diagnostic Procedure Auxiliary Code C-0 and Earlier ......................................... 12

2b. Diagnostic Procedure Auxiliary Code C-1 and Later ............................................ 15

C. Control Board Check ................................................................................................... 18

D. Bin Control Check ....................................................................................................... 18

E. Float Switch Check and Cleaning ............................................................................... 19

1. Float Switch Check ................................................................................................ 19

2. Float Switch Cleaning ............................................................................................ 19

F. Diagnostic Tables ......................................................................................................... 21

III. Controls and Relays ........................................................................................................ 23

A. Control Board .............................................................................................................. 23

B. Control Board Layout ................................................................................................... 24

C. Relays ......................................................................................................................... 25

D. Switches ...................................................................................................................... 25

1. Power Switch .......................................................................................................... 25

2. Flush/Control Switch .............................................................................................. 25

IV. Refrigeration Circuit and Component Service Information.............................................. 26

A. Refrigeration Circuit Service Information .................................................................... 26

B. Component Service Information .................................................................................. 29

1. Upper Bearing Wear Check ...................................................................... 32

2. Removal and Replacement of Cutter ..................................................................... 33

3. Removal and Replacement of Extruding Head ...................................................... 33

4. Removal and Replacement of Auger ..................................................................... 34

5. Removal and Replacement of Evaporator ............................................................. 35

6. Removal and Replacement of Mechanical Seal and Lower Housing ................... 36

7. Removal and Replacement of Gear Motor ............................................................. 37

V. Maintenance .................................................................................................................... 38

A. Maintenance Schedule ................................................................................................ 39

VI. Preparing the Appliance for Periods of Non-Use ............................................................ 40

VII. Disposal ......................................................................................................................... 41

3

VIII. Technical Information .................................................................................................... 42

A. Specication Sheet ..................................................................................................... 42

1. F-330BAH............................................................................................................... 42

2. F-330BAH-C .......................................................................................................... 43

B. Performance Data Sheet ............................................................................................. 44

1. F-330BAH............................................................................................................... 44

2. F-330BAH-C .......................................................................................................... 45

C. Wiring Diagrams .......................................................................................................... 46

1a. F-330BAH(-C) Label Diagram Auxiliary Code C-0 and Earlier ............................ 46

1b. F-330BAH(-C) Ladder Diagram Auxiliary Code C-0 and Earlier .......................... 47

2a. F-330BAH(-C) Label Diagram Auxiliary Code C-1 and Later ............................... 48

2b. F-330BAH(-C) Ladder Diagram Auxiliary Code C-1 and Later ............................ 49

4

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the

appliance or property.

IMPORTANT Indicates important information about the use and care of the

appliance.

WARNING

The appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.

To reduce the risk of death, electric shock, serious injury, or re, follow basic
precautions including the following:

• Only qualied service technicians should install and service this appliance.

• The appliance must be installed in accordance with applicable national, state, and

local codes and regulations. Failure to meet these code requirements could result in
death, electric shock, serious injury, re, or damage to the appliance.

• To reduce the risk of electric shock, do not touch the appliance power switch or plug

with damp hands.

• Make sure the appliance power switch is in the "OFF" position before plugging in or

unplugging the appliance.

• Before servicing, move the power switch to the "OFF" position. Unplug the

appliance from the electrical outlet.

• The appliance requires an independent power supply of proper capacity. See the

nameplate for electrical specications. Failure to use an independent power supply
of proper capacity can result in a tripped breaker, blown fuses, damage to existing
wiring, or component failure. This could lead to heat generation or re.

• THE APPLIANCE MUST BE GROUNDED. The appliance is equipped with a
NEMA5-15 three-prong grounding plug to reduce the risk of potential shock
hazards. It must be plugged into a properly grounded, independent 3-prong wall
outlet. If the outlet is a 2-prong outlet, it is your personal responsibility to have
a qualied electrician replace it with a properly grounded, independent 3-prong
wall outlet. Do not remove the ground prong from the power cord and do not use
an adapter plug. Failure to properly ground the appliance could result in death or
serious injury.

• Do not make any alterations to the appliance. Alterations could result in electric

shock, injury, re, or damage to the appliance.

5

WARNING, continued

• Do not use an extension cord.

• Do not use an appliance with a damaged power cord. The power cord should not

be altered, jerked, bundled, weighed down, pinched, or tangled. Such actions could
result in electric shock or re. To unplug the appliance, be sure to pull the plug, not
the cord, and do not jerk the cord.

• The GREEN ground wire in the factory-installed power cord is connected to the

appliance. If it becomes necessary to remove or replace the power cord, be sure to
connect the power cord's ground wire.

• Do not place ngers or any other objects into the ice discharge opening.

• The appliance is not intended for use by persons (including children) with reduced

physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.

• Children should be properly supervised around this appliance.

• Do not climb, stand, or hang on the appliance or allow children or animals to do so.

Serious injury could occur or the appliance could be damaged.

• Do not use combustible spray or place volatile or ammable substances near the

appliance. They might catch re.

• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance

could cause harm to individuals or damage to the appliance.

NOTICE

• Follow the instructions in this manual carefully to reduce the risk of costly water

damage.

• In areas where water damage is a concern, install in a contained area with a oor

drain.

• Install the appliance in a location that stays above freezing. Normal operating

ambient temperature must be within 45°F to 100°F (7°C to 38°C).

• Do not leave the appliance on during extended periods of non-use, extended

absences, or in sub-freezing temperatures. To properly prepare the appliance

for these occasions, follow the instructions in "VI.C. Preparing the Appliance for
Periods of Non-Use."

• Do not place objects on top of the appliance.

• The ice storage bin is for ice use only. Do not store anything else in the ice storage

bin.

6

I. Construction and Water/Refrigeration Circuit Diagram

A. Construction

1a. F-330BAH(-C) Auxiliary Code C-0 and Earlier

Bin Control
The switch actuator is
located in the ice storage bin.

Ice Storage Bin

Control Box

Spout

Evaporator Heater

(-C Model)

Evaporator

Gear Motor

Front

Inlet Water Valve

Spout Safety Switch

Reservoir

Flush/Drain Valve

Compressor

Rear

7

1b. F-330BAH(-C) Auxiliary Code C-1 and Later

Spout

Evaporator Heater
(-C Model)

Control Box

Bin Control
The switch actuator is
located in the ice storage
bin.

Ice Storage Bin

Front

Inlet Water Valve

Evaporator

Gear Motor

Compressor

Reservoir

Drain Valve

Rear

8

B. Ice Making Appliance

1. F-330BAH(-C)

Cutter

Extruding Head Upper Bearing

Auger

Cylinder

Mechanical-Seal

O-Ring

Evaporator Heater (-C Model)

Seal Bolt

Insulation

Housing-Lower Bearing

Spline Coupling

Socket Head Cap Screw
and Split Lock Washer

Hex Bolt and Washer

Gear Motor

9

C. Water/Refrigeration Circuit Diagram

Spout

Water Supply

Inlet Water Valve

Reservoir

Overow

Float Switch

Drier

Heater (-C Model)

Water Level

Evaporator

To Drain

Flush/Drain Valve

Gear Motor

Capillary Tube

Condenser

Fan Motor

High-Pressure Switch

Compressor

Refrigeration Circuit

Water Circuit

10

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

WV continues

GM de-energized

Legend:

BC-bin control

CB-control board

Comp-compressor

DV-ush/drain valve

FM-fan motor

GM-gear motor

UFS open

90 sec. timer

exceeded

GM continues

WV continues

Comp de-energized

FM de-energized

If rell achieved, icemaking cycle

starts and timers are reset.

4. Low Water Safety

90 sec. FT exceeded

60 sec. GM timer

LFS-lower oat switch

UFS-upper oat switch

WV-inlet water valve

to "1. Fill Cycle" above

BC closed

DV de-energized

Rell

90 sec. FT starts when LFS

opens and terminates when

UFS closes.

LFS closed

UFS closed

90 sec. timer

terminated

Comp continues

GM continues

FM continues

WV de-energized

4. Icemaker Restart

Maximum 90 sec.

UFS open

LFS open

90 sec. timer started

Comp continues

GM continues

FM continues

WV energized

3. Icemaker Off
DV energized

GM de-energized

3. Freeze Cycle

GM continues

Comp energized

FM energized

60 sec.

2. Ice Purge Cycle

F-330BAH(-C) Sequence Flow Chart

60 sec.

GM continues

Comp de-energized

FM de-energized

2. Ice Purge Cycle
LFS closed

UFS closed

GM energized

WV de-energized

90 sec.

1. Bin Full
BC open

Comp continues

FM continues

1. Fill Cycle

GM continues

WV energized

Flush/Control Switch in the "FLUSH" or "DRAIN" Position

When the ush/control switch is in the "FLUSH" or "DRAIN" position, 24VAC is supplied to the ush/drain valve through

the X3 and X5 relays for C-0 and earlier and X10 and X12 relays for C-1 and later.

Bin Control Switch Open

When the bin control opens and the icemaker shuts down, the ush/drain valve energizes continuously through

the X3 and X5 relays for C-0 and earlier and X10 and X12 relays for C-1 and later.

Cycle Steps

Power switch "ON"

Flush/Control switch in "ICE"

Startup

• Low-water safety circuit closed.

• 60 sec. Comp delay timer starts.

Shutdown & Restart

11

B. Service Diagnosis

WARNING

• The appliance should be diagnosed and repaired only by qualied service

personnel to reduce the risk of death, electric shock, serious injury, or re.

• Risk of electric shock. Use extreme caution and exercise safe electrical practices.

• Moving parts (e.g., fan blade or auger) can crush and cut. Keep hands clear.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are

securely in place after the appliance is serviced. Make sure that none have fallen
into the ice storage bin.

• Make sure all food zones in the icemaker and ice storage bin are clean after

service.

1. Ice Production Check

To check production, prepare a bucket or pan to catch the ice and a set of scales to
weigh the ice. After the appliance has operated for 10 to 20 minutes, catch the ice
production for 10 minutes. Weigh the ice to establish the batch weight. Multiply the
batch weight by 144 for the total production in 24 hours. When conrming production or
diagnosing low production, reference production information to the performance data

charts found in "VIII.B. Performance Data Sheet."

2a. Diagnostic Procedure Auxiliary Code C-0 and Earlier

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, safety switch is open,
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) Conrm the appliance is plugged into the electrical outlet, supply voltage is correct per
nameplate.

2) Remove the front panel.

3) Conrm the power switch is in the "ON" position, then move the ush switch to the
"FLUSH" position. DV Diagnosis: If DV does not energize, check for 24VAC at X6relay

#5 (BK) to neutral (LBU) and at X6 relay #1 (W/O) to neutral (LBU). If 24VAC is present
at #5 (BK) and not at #1 (W/O), X6 relay is energized (safety switch closed) or contacts
sticking. Replace as needed. If 24VAC is present at X6 relay #1 (W/O) and DV does
not energize, check for 24VAC at X5 relay #6 (W/O) to neutral (LBU). If 24VAC is not
present, X5 relay is energized or contacts are sticking. Replace as needed. If 24VAC is
present, check DV coil continuity. If open, replace DV.

12

4) Startup/Fill Cycle–Move any ice away from the BC actuator paddle (located at the

top of the bin). Move the ush switch to the "ICE" position. X5 relay and WV energize.

Reservoir lls, LFS closes, nothing happens at this time. The reservoir continues to ll.
X5 Relay Diagnosis: Check that WV energizes and lls the reservoir. If not, conrm BC

is closed. See "II.D. Bin Control Check." Conrm ush switch is in the "ICE" position and

switch is closed. Next, check for 24VAC at X5 #7 (V) to X5relay #8 (LBU). If 24VAC is
present, check for 24VAC at X5 relay #5(W/R) to neutral (LBU) and at #3(R) to neutral
(LBU). If24VAC is present at #5(W/R) and not at #3 (R), replace X5 relay. If24VAC is
present at X5relay #3 (R), check X4relay. X4 Relay Diagnosis: Check for 24VAC at X4
relay #5 (R) to neutral (LBU) and at #1 (O) to neutral (LBU). If24VAC is present at X11
relay #5 (R) and not at #1(O), conrm X4relay is de-energized.

If X4 relay is energized, check for sticking UFS. See"II.E.Float Switch Check and
Cleaning." If X4 relay is de-energized, replace X4 relay. WV Diagnosis: If 24VAC is

present at X4 #1 (O), check WV coil continuity. Ifopen, replace WV.

5) Ice Purge Cycle–UFS closes, X4 relay energizes, WV de-energizes, and low-water
safety circuit (CB #3 and #4) closes. GM and X3 relay energize, 60 sec. Comp delay
timer starts. If HPS is open, CB does not get 24VAC control voltage and 35VDC supply
is not present for low-water safety circuit. HPSDiagnosis: If HPS is open, check that
the condenser air lter 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. X4RelayDiagnosis: Check for 35VDC at X4 relay #4 (DBU) to #6(BR).
If35VDC is present, X4 relay is de-energized or bad. Replace as necessary. If 0VDC
is present, GM energizes. GM Diagnosis: If GM does not energize and 0VDC is read
at CB#3 (BR) to CB #4(DBU), check for 115VAC at CB#7 (BR) to neutral (W) and CB
#8(W/BR) to neutral (W). If 115VAC is present on CB #7 (BR) and not on CB
#8 (W/BR), replace CB. If 115VAC is present on CB #8 (W/BR), check GM external
protector and GM winding. IfGMstarts but the auger does not turn, check coupling
between auger and GM. X3 Relay Diagnosis: X3 relay energizes and starts 60 sec.
Comp delay timer in CB (CB #10 (W/BK) and #11 (W/O)). After 60 sec. timer terminates,
conrm Comp energizes. If not, check for 115VAC at X3 relay #7 (R) to X3relay #8(W).
If 115VAC is not present, check GM external protector and GM winding. If115VAC is
present, check for 35VDC at X3 relay #4 (W/O) to X3 relay #6(W/BK). If 35VDC is
present, replace X3 relay. If 0VDC is present and Comp does not energize, replace CB.

See "II.C. Control Board Check."

6) Freeze Cycle–GM and X3 relay continue. Comp and FM energize. X4 relay
energizes and de-energizes as needed through LFS/UFS. Ice production begins
4to 6 minutes after Comp and FM start depending on ambient and water conditions.
Diagnosis:Check that Comp and FM energize. If not, check for 115VAC at CB X2 relay
#4 (BR) to neutral (W) and CB X2 relay #3 (O) to neutral (W). If 115VAC is present at
CB X2 relay #4 (BR) and not at CB X2 relay #3 (O), replace CB. If 115VAC is present at
CB X2 relay #3 (O) and Comp and FM do not energize, for Comp check Comp winding,
start capacitor, and start relay. ForFM, check FM windings and fan blade for binding.

13

7) Rell/Low-Water Safety Cycle–As ice is produced, water level in the reservoir drops.
UFS opens, nothing happens at this time. LFS opens and rell begins. X4relay
de-energizes, low water safety circuit opens (X4relay #4 (DBU) and #6(BR), and
CB #3 (BR) and #4 (DBU)), CB 90 sec. low-water safety timer starts. WV energizes.
Comp, FM, GM, and X3 relay continue. UFS must close before 90 sec. low-water safety
timer terminates. Otherwise, shutdown cycle is initiated. Once UFS closes, X4relay
energizes, WV de-energizes, and low-water safety circuit closes, terminating 90 sec.
low-water safety timer.
Diagnosis – Check that WV energizes. If not, conrm LFS status (open), X4 relay
de-energized. If not, see step 5 above.

8) Shutdown–Ice lls ice storage bin and presses BC actuator to open BC. Comp, FM,
GM, and X3 relay continue. X5 relay and X4 relay de-energize. 90 sec. low-water
safety timer starts. When 90 sec. low-water safety timer terminates, Comp and FM
de-energize. GM and X3 relay continue. 60 sec. GM delay timer starts. Once 60 sec.
GM delay timer terminates, GM and X3 relay de-energize. DV energizes. Reservoir and
evaporator drain. DV remains energized until BC closes again.
Diagnosis: Check that BC actuator paddle is activated and not sticking. Conrm BC

is open and X5 relay de-energizes. If not, see "II.D. Bin Control Check." Next, conrm

X4relay de-energizes. If not, check for 24VAC at X5 relay #3 (R) to neutral (LBU).
If24VAC is present, replace X5 relay. If X4 relay is de-energized, after 90 sec. conrm
Comp and FM de-energize. If not, check for 35VDC at CB #3 (BR) to CB #4(DBU).
If0VDC is present, replace X4 relay. If 35VDC is present and Comp and FM remain
energized, replace CB. 60 sec. after Comp and FM de-energize, conrm that GM and
X3 relay de-energize. If not, replace CB. Next, conrm DVenergizes. Ifnot, check for
24VAC at X5 relay #6 (W/O) to neutral (LBU). If 24VAC is not present, check for 24VAC
at X5 relay #2 (W/R) to neutral (LBU). If 24VAC is present at X5 relay #2 (W/R) and not
at #6 (W/O), replace X5 relay. If 24VAC is present at X5 relay #6 (W/O) to neutral (LBU)
and DV is not energized, check for 24VAC at X5 relay #6 (W/O) to X3 relay #5 (LBU)
and X5 #6 (W/O) to X3 relay #1 (Y). If 24VAC is present at X3 relay #5 (LBU) and not
at #1(Y), replace X3 relay. If 24VAC is present, check DV coil continuity and replace as
necessary. IfDV coil is good, check for crimped drain hose or clogged drain line.

Legend: BC–bin control; CB–control board; Comp–compressor; CT–control transformer;

DV–drain valve; FM–fan motor; GM–gear motor; HPS–high-pressure switch;
LFS–lower oat switch; UFS–upper oat switch; WV–inlet water valve;
X3–compressor delay relay; X4–water control relay; X5–control relay; X6–safety

relay

14

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) Conrm the appliance is plugged into the electrical outlet, supply voltage is correct per
nameplate.

2) Remove the front panel.

3) Conrm 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 lter 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 lls, LFS closes, nothing happens at this time. The reservoir continues to ll.
X10 Relay Diagnosis: Check that WV energizes and lls the reservoir. If not, conrm

BC is closed. See "II.D. Bin Control Check." Conrm 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), conrm 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