Hoshizaki America KM-1601MRH Service Manual

Hoshizaki

“A Superior Degree

of Reliability”

www.hoshizaki.com

Models KM-1601MRH KM-1601MRH

Modular Crescent Cuber

Hoshizaki America, Inc.

Number: 73129 Issued: 6-16-2006

SERVICE MANUAL

IMPORTANT

Only qualiﬁed service technicians should attempt to service or maintain this icemaker. No such service or maintenance should be undertaken until the technician has thoroughly read this Service Manual.

HOSHIZAKI provides this manual primarily to assist qualiﬁed service technicians in the service and maintenance of the icemaker.

Should the reader have any questions or concerns which have not been satisfactorily addressed, please call or write to the HOSHIZAKI Technical Support Department for assistance.

HOSHIZAKI AMERICA, INC. 618 Highway 74 South Peachtree City, GA 30269

Attn: HOSHIZAKI Technical Support Department

Phone: 1-800-233-1940 Technical Service (770) 487-2331 Fax: 1-800-843-1056 (770) 487-3360

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

Please review this manual. It should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualiﬁed service technicians should service and maintain the icemaker. This manual should be made available to the technician prior to service or maintenance.

CONTENTS

I. Speciﬁcations ...................................................................................................................... 5

A. Icemaker ....................................................................................................................... 5

1. KM-1601MRH .......................................................................................................... 5

2. KM-1601MRH3 ....................................................................................................... 6

B. Condensing Unit ............................................................................................................ 7

1. URC-21F ................................................................................................................. 7

II. General Information ........................................................................................................... 9

A. Construction .................................................................................................................. 9

1. KM-1601MRH, KM-1601MRH3 ............................................................................... 9

B. Sequence of Operation ............................................................................................... 10

1. One Minute Fill Cycle ............................................................................................ 10

2. Initial Harvest Cycle .............................................................................................. 10

3. Freeze Cycle ......................................................................................................... 10

4. Pump-Out Cycle ................................................................................................... 10

5. Normal Harvest Cycle .......................................................................................... 10

C. Control Board .............................................................................................................. 12

1. Control Board Layout ............................................................................................. 13

2. Features ................................................................................................................ 14

a) Maximum Water Supply Period – 6 minutes ....................................................... 14

b) Harvest Backup Timer and Freeze Timer ........................................................... 14

c) High Temperature Safety .................................................................................... 14

d) Low Water Safety ............................................................................................... 14

e) High Voltage and Low Voltage Cut-outs ............................................................. 14

f) LED Lights and Audible Alarm Safeties ............................................................... 15

3. Controls and Adjustments ..................................................................................... 16

a) Default Dip Switch Settings ................................................................................ 16

b) Harvest Control – Thermistor ............................................................................. 16

c) Harvest Timer (dip switch 1 & 2) ......................................................................... 17

d) Pump-Out Timer (dip switch 3 & 4) .................................................................... 17

e) Pump-Out Frequency Control (dip switch 5 & 6) ................................................ 18

f) Freeze Timer (dip switch 9 & 10) ......................................................................... 18

g) Bin Control .......................................................................................................... 18

4. Control Board Check Procedure ............................................................................ 19

5. Control Board Replacement .................................................................................. 19

III. Technical Information ...................................................................................................... 20

A. Water Circuit and Refrigeration Circuit ........................................................................ 20

1. KM-1601MRH, KM-1601MRH3 ............................................................................. 20

B. Wiring Diagrams .......................................................................................................... 21

1. KM-1601MRH ........................................................................................................ 21

2. KM-1601MRH3 ...................................................................................................... 22

C. Timing Chart ............................................................................................................... 23

D. Performance Data ....................................................................................................... 25

1. KM-1601MRH ........................................................................................................ 25

2. KM-1601MRH3 ...................................................................................................... 26

IV. Service Diagnosis ........................................................................................................... 27

A. 10-Minute KM Diagnostic Procedure ......................................................................... 27

B. Diagnostic Charts ........................................................................................................ 28

1. No Ice Production .................................................................................................. 28

2. Evaporator is Frozen Up ........................................................................................ 31

3. Low Ice Production ................................................................................................ 33

4. Abnormal Ice ......................................................................................................... 33

5. Other ...................................................................................................................... 33

V. Removal and Replacement of Components .................................................................... 35

A. Service for Refrigerant Lines ...................................................................................... 35

1. Refrigerant Recovery ............................................................................................. 35

2. Evacuation and Recharge (R-404A) ...................................................................... 35

B. Brazing ........................................................................................................................ 36

C. Removal and Replacement of Compressor ................................................................ 37

D. Removal and Replacement of Drier ............................................................................ 38

E. Removal and Replacement of Expansion Valve .......................................................... 38

F. Removal and Replacement of Hot Gas Valve and Line Valve ...................................... 39

G. Removal and Replacement of Evaporator .................................................................. 40

H. Removal and Replacement of Headmaster (Condensing Pressure Regulator - C.P.R.)

- Remote Air-Cooled Model Only .............................................................................. 41

I. Removal and Replacement of Thermistor .................................................................... 42

J. Removal and Replacement of Fan Motor .................................................................... 43

K. Removal and Replacement of Inlet Water Valve ......................................................... 43

L. Removal and Replacement of Pump Motor ................................................................. 44

M. Removal and Replacement of Spray Tubes ................................................................ 44

VI. Cleaning and Maintenance Instructions ......................................................................... 45

A. Cleaning and Sanitizing Procedures ........................................................................... 45

1. Cleaning Procedure ............................................................................................... 46

2. Sanitizing Procedure - Following Cleaning Procedure .......................................... 47

B. Maintenance ................................................................................................................ 48

C. Preparing the Icemaker for Long Storage ................................................................... 48

I. Speciﬁcations

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 11.6 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *1508 (684) 1483 (673) 1399 (634) Reference without *marks 80 1489 (675) 1450 (658) 1338 (607)

90 1483 (673) *1422 (645) 1320 (599)

100 1449 (657) 1398 (634) 1227 (557) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 29.8 lbs. (13.5 kg) 1440 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2670(4.5) 2450(3.9) WATER gal./24HR (gal./100 lbs.) 263(18.5) 483(32.0) EXTERIOR DIMENSIONS (WxDxH) 30" x 27.4" x 41.7" (762 x 695 x 1059 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 259 lbs. (117 kg), Shipping 316 lbs. (143 kg) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

3/8" OD Tube CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Thermostat COMPRESSOR Hermetic, Model CS18K6E-PFV CONDENSER Air-Cooled Remote, Condenser Unit URC-21F EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-21F

REFRIGERANT CHARGE R-404A, 24 lb. 4.0 oz. (11,000g)

(Icemaker 14 lbs. 8.8 oz. Cond. Unit 9 lb. 11.2 oz.) DESIGN PRESSURE High 467PSIG, Low 230PSIG P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal ) COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal ) REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch LOW WATER PROTECTION Float Switch ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Dispenser or Ice Storage Bin, Remote Condenser Unit OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

A. Icemaker

1. KM-1601MRH

We reserve the right to make changes in speciﬁcations and design without prior notice.

2. KM-1601MRH3

AC SUPPLY VOLTAGE 208-230/60/3 AMPERAGE 8.4 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *1471 (667) 1448 (657) 1354 (614) Reference without *marks 80 1453 (659) 1417 (643) 1290 (585)

90 1448 (657) *1392 (631) 1277 (579)

100 1408 (639) 1365 (619) 1171 (531) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 28.0 lbs. (12.7 kg) 1440 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2640(4.6) 2410(3.9) WATER gal./24HR (gal./100 lbs.) 267(19.2) 491(33.4) EXTERIOR DIMENSIONS (WxDxH) 30" x 27.4" x 41.7" (762 x 695 x 1059 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 259 lbs. (117 kg), Shipping 316 lbs. (143 kg) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

3/8" OD Tube CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Thermostat COMPRESSOR Hermetic, Model CS18K6E-TF5 CONDENSER Air-Cooled Remote, Condenser Unit URC-21F EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-21F

REFRIGERANT CHARGE R-404A, 24 lb. 4.0 oz. (11,000g)

-REQUIRED Ice Dispenser or Ice Storage Bin, Remote Condenser Unit OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

We reserve the right to make changes in speciﬁcations and design without prior notice.

B. Condensing Unit

1. URC-21F

MODEL: URC-21F

AC SUPPLY VOLTAGE 115/60/1 (Connection to Icemaker)

FAN MOTOR 115 V Total 2.6FLA 130W

EXTERIOR DIMENSIONS (WxDxH) 46-3/8" x 15-11/16" x 25-15/16" (1178 x 398 x 659 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 48-7/16" x 18-1/8" x 40-7/8" (1230 x 460 x 1039 mm)

EXTERIOR FINISH Galvanized Steel

WEIGHT Net 158 lbs. ( 72 kg ) Shipping 169 lbs. ( 77 kg )

CONNECTIONS - ELECTRIC Permanent - Connection

- REFRIGERANT Discharge Line 1-1/16"-12 UNF Fitting (#10 AEROQUIP)

Liquid Line 5/8"-18 UNF Fitting (#6 AEROQUIP)

CONDENSER Air-cooled, Fin and tube type

FAN MOTOR PROTECTION Thermal Protection

REFRIGERANT CONTROL Condensing Pressure Regulator

REFRIGERANT CHARGE R-404A 9 lb. 11oz. (4400g)

DESIGN PRESSURE High 467 PSIG 32.2 Bar

OPERATING CONDITIONS VOLTAGE RANGE 104 ~ 127 V

AMBIENT TEMP. -20 ~ 122 °F

ACCESSORIES -SUPPLIED Leg 2 pcs

Hex. Head Bolt w/Washer 8 x 16 8 pcs

Hex. Nut 8 8 pcs

SPECIFICATIONS

II. General Information

A. Construction

1. KM-1601MRH, KM-1601MRH3

Evaporator

Cleaning Valve

Control Box

Control Switch

Bin Control Thermostat

Spray Tube

Inlet Water Valve

Water Supply Inlet

Hot Gas Valve

Junction Box

Check Valve

Expansion Valve

Line Valve

Receiver Tank

Float Switch

Water Pump

Compressor

Capacitor Box (KM-1601MRH) Transformer Box (KM-1601MRH3)

Drier

B. Sequence of Operation

The steps in the sequence are as outlined below. When power is supplied, a 5 second delay occurs at startup. Note that the order of the LEDs from the outer edge of the board is 1, 4, 3, 2.

1. One Minute Fill Cycle

LED 4 is on. WV opens and the ﬁll period begins. After 1 minute, the board checks for a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV will remain energized through additional 1 minute cycles until water enters the sump and F/S closes. This serves as a low water safety to protect the water pump.

2. Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV remains open, Comp and FMR energize, HGV opens, and harvest begins. As the evaporator warms, the thermistor located on the suction line checks for a 48°F (9°C) temperature. When 48°F (9°C) is reached, a 3.9 kΩ signal turns the harvest over to the adjustable harvest timer which is factory set for normal conditions. The timer has settings of 60, 90, 120, and 180 seconds (dip switch 1 & 2). The water valve is open during harvest for a maximum of 6 minutes or the length of harvest, whichever is shorter. When the harvest timer completes its count down, the harvest cycle is complete and the freeze cycle starts. The minimum total time allowed by the board for a complete harvest cycle is 2 minutes.

3. Freeze Cycle

LED 1 is on. Comp and FMR continue to run, PM and FMS energize, LLV opens, HGV and WV close and the freeze cycle starts. For the ﬁrst 5 minutes the control board will not accept a signal from F/S. This 5 minute minimum freeze acts as a short cycle protection. At the end of 5 minutes, F/S assumes control. As ice builds on the evaporator the water level in the sump lowers. The freeze continues until F/S opens and terminates ice production.

4. Pump-Out Cycle

LEDs 1, 3, and 2 are on. Comp and FMR continue to run, HGV opens, LLV closes, and FMS deenergizes. PM stops for 2 seconds and reverses, taking water from the bottom of the sump and forcing pressure against the check valve seat allowing water to go through the check valve and down the drain. At the same time water ﬂows through the small tube to power ﬂush the F/S. When the pump-out timer stops counting, the pump out is complete. Pump out always occurs on the 2nd harvest after startup. Then, depending on the control board setting, pump out occurs every cycle, or every 2nd, 5th or 10th cycle (dip switch 5 &

6).

5. Normal Harvest Cycle

LEDs 1, 4, and 2 are on. Comp and FMR continue to run, HGV remains open and WV opens. As the evaporator warms, the thermistor reaches 48°F (9°C). The control board then receives the thermistor's 3.9 kΩ signal and starts the harvest timer. The water valve is open during harvest for a maximum of 6 minutes or the length of harvest, whichever is shorter. When the harvest timer completes its count down, the harvest cycle is complete and the next freeze cycle starts. The unit continues to cycle through 3, 4 and 5 sequence until the bin control senses ice and shuts the unit down.

Legend:

F/S–ﬂoat switch; HGV–hot gas valve; LLV–Liquid Line Valve; PM–pump motor; WV–inlet water valve

Comp–compressor; FMR–remote fan motor; FMS–self-contained fan motor;

Cycle

4. Pump-Out

Pump motor stops

for 2 sec. and then

reverses for 10/20 sec.

each 1, 2, 5, or 10 cycles.

Comp continues

FMR continues

HGV energized

FMS de-energized

2. Harvest Cycle 3. Freeze Cycle

• Minimum freeze time: 5 minutes

F/S in

5 minute timer

• Maximum freeze time: freeze timer setting

1 to 3 minute timer

control

in control

F/S closed

in control

Freeze cycle

Comp continues

F/S Check

Thermistor temp

F/S

operation turned

over to

FMR continues

HGV de-energized

WV de-energized

reaches 48°F (9°C)

(3.9 kΩ or less)

Harvest timer starts

PM energized

FMS energized

F/S open

If F/S is open, compressor stops and cycle returns to 1 minute ﬁll

control

Thermistor in

• Maximum inlet water valve time: 6 minutes

• Maximum harvest time: 20 minutes

Fill Cycle

1. One Minute

F/S closed

F/S Check

Comp energized

WV Energized

HGV energized

KM-1601MRH, KM-1601MRH3 Sequence Flow Chart and Component Operation

Cycle Steps

"E" board will have

Initial startup always

5 second delay

begins here

FMR energized

WV continues

F/S open

Comp - compressor FMS - self-contained fan motor HGV - hot gas valve WV - inlet water valve

Legend:

FMR - remote fan motor F/S - ﬂoat switch PM - pump motor

C. Control Board

• A HOSHIZAKI exclusive solid-state control is employed in KM-1601MRH and KM-1601MRH3 Modular Crescent Cubers.

• All models are pretested and factory-adjusted.

CAUTION

1. Fragile, handle very carefully.

2. A control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit when handling or replacing the board.

3. Do not touch the electronic devices on the board or the back of the board to prevent damage to the board.

4. Do not change wiring and connections. Do not misconnect K3, K4 and K5, because the same connector is used for the thermistor and ﬂoat switch. K4 is not connected.

5. Always replace the whole board assembly if it goes bad.

6. Do not short out power supply to test for voltage.

1. Control Board Layout

Control Products "E" Control Board

Alarm Reset Switch

Backup Freeze Timer LED

Backup Harvest Timer LED

Alarm Buzzer

Dip Switch

Output Test Switch (used to test relays on board)

Connector K3 Harvest Control (thermistor)

Connector K4 Open (not connected)

Power LED (lights when power is supplied to the board)

Relay LEDs (4) (indicate which relays are energized as listed below)

LED 2 Hot Gas Valve (HGV) Self-Contained Fan Motor (FMS) (FMS off when LED on)

LED 3 Pump Motor (PM) (on at pump out only)

LED 4 Water Valve (WV)

LED 1 Compressor (Comp) Remote Fan Motor (FMR)

Transformer Connector

Microprocessor (board revision level indicated by last 2 digits on label)

Connector K5 Float Switch

Part Number

Connector K1

Pins #1 through #10 #1, 9 Magnetic Contactor #2 Hot Gas Valve #3 Line Valve Self-Contained Fan Motor (FMS) #4 Pump Motor (icemaking) #5 Pump Motor (drain) #6 Water Valve #7, 10 Power (line, bin control) #8 Open

Switch for "C" board and "ALPINE" board (service boards only)

Control Board

Part Number 2A1410-01 (factory); 2A1410-02 (service)

Type HOS-001A (Control Products - 10 Pin)

2. Features

a) Maximum Water Supply Period – 6 minutes

Inlet water valve opening, in the harvest cycle, is limited by the harvest timer. The water valve cannot remain open longer than the maximum period. The water valve can close in less than six minutes if the harvest cycle is completed.

b) Harvest Backup Timer and Freeze Timer

The harvest backup timer shuts down the icemaker if, for two cycles in a row, the harvest cycle takes more than 20 minutes to complete. The control board will signal this problem using 2 beeps every 3 seconds. The freeze timer shuts down the icemaker if, for two cycles in a row, the freeze cycle takes longer than the time speciﬁed to complete. The control board will signal this problem using 3 beeps every 3 seconds. The time is factory set using dip switches 9 &

10. The reset button on the control board must be pressed with power on to reset either of these safeties.

c) High Temperature Safety

The temperature of the suction line in the refrigeration circuit is limited by the high temperature safety. This protects the unit from excessively high temperatures. If the evaporator temperature rises above 127 ± 7°F (53 ± 4°C), the thermistor operates the safety. This shuts down the circuit and the icemaker automatically stops. The control board will signal this problem using 1 beep every 3 seconds. The reset button on the control board must be pressed with power on to reset the safety.

d) Low Water Safety

If the pump motor is operated without water, the mechanical seal can fail. To prevent this type of failure, the control board checks the position of the ﬂoat switch at the end of the initial one minute water ﬁll cycle and at the end of each harvest cycle. If the ﬂoat switch is in the up position (electrical circuit closed), the control board changes to the ice making cycle. If the ﬂoat switch is in the down position (electrical circuit open), the control board changes to additional one minute water ﬁll cycles until water enters the sump and the ﬂoat switch closes. When the ﬂoat switch closes, the control board changes to the ice making cycle. The unit will not start without adequate water in the sump. This serves as a low water safety to protect the pump motor from mechanical seal failure. For water-cooled model, if the water is shut off, the unit is protected by the high pressure switch.

e) High Voltage and Low Voltage Cut-outs

The maximum and minimum allowable supply voltages of this icemaker are limited by the high voltage and low voltage cut-outs. If miswiring (especially on single phase 3 wire models) causes excessive voltage (147Vac ±5% or more) on the control board, the high voltage cut-out shuts down the circuit in 3 seconds and the icemaker automatically stops. The control board will signal this problem using 7 beeps every 3 seconds. The icemaker also automatically stops in cases of insufﬁcient voltage (92Vac ±5% or less). The control board will signal this problem using 6 beeps every 3 seconds. When the proper supply voltage is resumed, the icemaker automatically starts running again.

f) LED Lights and Audible Alarm Safeties

The red LED indicates proper control voltage and will remain on unless a control voltage problem occurs. At startup a 5 second delay occurs while the board conducts an internal timer check. A short beep occurs when the power switch is turned OFF. The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the board is 1, 4, 3,

2. For more information, see "II.B. Sequence of Operation."

Sequence Step LED

1 Minute Fill Cycle Harvest Cycle

Freeze Cycle

Reverse Pump Out

The built in safeties shut down the unit and have alarms as follows:

No. of Beeps

(every 3 sec.)

1 High Evaporator Temp.

2 Harvest Backup Timer

4 WV 60 seconds 1, 4, and 2 WV, HGV,

1 Comp, PM,

1, 3, and 2 Comp, HGV,

Type of Alarm

(temperature > 127°F) (53°C)

(harvest > 20 min. for two cycles in a row)

Energized

Components

Comp, FMR

FMR/FMS, LLV

PM, FMR

Min. Max. Avg.

2 minutes 20 minutes 3 to 5 minutes

5 minutes freeze timer

10 seconds 20 seconds factory setting

Check for harvest problem (stuck HGV or relay), hot water entering unit, stuck HM, or shorted thermistor.

Orange LED marked H TIMER lights up. Check for open thermistor, HGV not opening, TXV leaking by, low charge, or inefﬁcient compressor.

Time LEDs are On

setting

Notes

30 to 35 minutes

3 Freeze Timer

(freeze > speciﬁed setting for two cycles in a row) Timer is factory set using dip switches 9 & 10

To manually reset the above safeties, press the alarm reset button with the power supply on.

6 Low Voltage

(92Vac ±5% or less)

7 High Voltage

(147Vac ±5% or more)

Legend: Comp–compressor; FMR–remote fan motor; FMS–self-contained fan motor; F/S–ﬂoat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); LLV–Liquid Line Valve; PM–pump motor; TXV–thermostatic expansion valve; WV–inlet water valve

Yellow LED marked F TIMER lights up. Check for F/S stuck closed (up), WV leaking by, HGV leaking by, TXV not feeding properly, low charge, HM not bypassing, or inefﬁcient compressor.

Red LED will turn off if voltage protection operates. The control voltage safeties automatically reset when voltage is corrected.

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