Kitchen Equipment

Lincoln Pizza Oven Service Manual and Error Code

Pizza Oven Error Code, Service Manual, Troubleshooting , Wiring Diagram , Pizza Oven Parts



Old Model Number New   Model Number
1433-000-E 1433-00z-U-Kxxxx (Europe)
1433-000-E 1446-00z-U-Kxxxx (Asia)
1434-000-E 1434-00z-U-Kxxxx (Europe,   Middle East, Africa)
1434-000-E 1447-00z-U-Kxxxx (Asia)
1456 1446-00z-U-Kxxxx
1457 1457-00z-U-Kxxxx




MODEL 1433-000-E
230VAC 50 HZ. NAT. GAS
MODEL 1434-000-E 230VAC 50 HZ. LP GAS
MODEL 1456 220/240VAC 50 HZ. NAT. GAS
MODEL 1457 220/240VAC 50 HZ. LP GAS

POWER SUPPLY Electrical power is to be supplied to the oven by a three conductor
     service.
     Brown conductor is hot. Blue conductor is neutral. Green conductor is ground.
CONTROL BOX AUTO
     COOL DOWN
When the temperature in the control box reaches 120°F ± 3°F (48.9°C
     ± 1.7°C), the cooling fan thermostat will switch power to the control box cooling fan. The thermostat will interrupt power to the cooling fan when the control box temperature falls to 100°F ± 3°F (37°C ± 1.7°C).
MAIN FAN CIRCUIT Electrical power is permanently supplied, through the 10 Amp oven fuse, to a normally open contact of the oven power switch. Power is
     also supplied to the control box cooling fan. Closing the oven power switch supplies line voltage to the main fan motor. Closing the oven
     power switch also supplies line voltage to the heat circuit and to the primary of the oven control transformer.
BURNER CIRCUIT Closing the oven power switch supplies line voltage through the main fan air pressure switch, through the normally closed oven cavity hi-limit
     thermostat. Through the gas pressure proving switch (gas pressure switch removed at S/N N31348) to the ignition control. The combustion
     motor is now energized, the normally open combustion air switch
     closes upon sensing air. After a pre-purge period between 30 and 60 seconds, the spark generator and the main gas valve are energized. Ignition should now occur
TEMPERATURE   CONTROL Closing the oven fan switch supplies line voltage to the primary of the
     control transformer and through the ignition control, to the oven control. Secondary voltage, 24VAC, is supplied to the oven control. The oven control is set to desired temperature. The thermocouple will
     provide varying millivolts to the oven control.   The oven control supplies   line voltage to the temperature regulation valve at intermittent intervals   to maintain desired temperature.   The display on the oven control will indicate when the temperature regulation valve is energized.
     NOTE: The display also indicates oven temperature.
CONVEYOR DRIVE Closing the oven power switch supplies   line voltage to the conveyor   motor and to the primary of the control transformer. Secondary
     voltage, 24VAC, is supplied to the oven control.   Setting the oven control to the desired time outputs voltage, through a reversing   switch,
     to the conveyor motor.
     NOTE: The conveyor system uses a hall effect sensor and magnet to prove operation of the conveyor motor. If the motor is not running, “BELT JAM” is indicated on the display.

POWER SUPPLY Electrical power is to be supplied to the oven by a three conductor
     service.
     Brown conductor is hot. Blue conductor is neutral. Green conductor is ground.
CONTROL BOX AUTO
     COOL DOWN
When the temperature in the control box reaches 120°F ± 3°F (48.9°C
     ± 1.7°C), the cooling fan thermostat will switch power to the control box cooling fan. The thermostat will interrupt power to the cooling fan when the control box temperature falls to 100°F ± 3°F (37°C ± 1.7°C).
MAIN FAN CIRCUIT Electrical power is permanently supplied, through the 10 Amp oven fuse, to a normally open contact of the oven power switch. Power is
     also supplied to the control box cooling fan. Closing the oven power switch supplies line voltage to the main fan motor. Closing the oven
     power switch also supplies line voltage to the heat circuit and to the primary of the oven control transformer.
BURNER CIRCUIT Closing the oven power switch supplies line voltage through the main fan air pressure switch, through the normally closed oven cavity hi-limit
     thermostat. Through the gas pressure proving switch (gas pressure switch removed at S/N N31348) to the ignition control. The combustion
     motor is now energized, the normally open combustion air switch
     closes upon sensing air. After a pre-purge period between 30 and 60 seconds, the spark generator and the main gas valve are energized. Ignition should now occur
TEMPERATURE   CONTROL Closing the oven fan switch supplies line voltage to the primary of the
     control transformer and through the ignition control, to the oven control. Secondary voltage, 24VAC, is supplied to the oven control. The oven control is set to desired temperature. The thermocouple will
     provide varying millivolts to the oven control.   The oven control supplies   line voltage to the temperature regulation valve at intermittent intervals   to maintain desired temperature.   The display on the oven control will indicate when the temperature regulation valve is energized.
     NOTE: The display also indicates oven temperature.
CONVEYOR DRIVE Closing the oven power switch supplies   line voltage to the conveyor   motor and to the primary of the control transformer. Secondary
     voltage, 24VAC, is supplied to the oven control.   Setting the oven control to the desired time outputs voltage, through a reversing   switch,
     to the conveyor motor.
     NOTE: The conveyor system uses a hall effect sensor and magnet to prove operation of the conveyor motor. If the motor is not running, “BELT JAM” is indicated on the display.
SYMPTOM POSSIBLE   CAUSE EVALUATION
Oven fan will not   run Incoming power supply Check circuit breaker, reset if required. Check power
     plug to be sure it is firmly in receptacle. Measure incoming power, call power co. if required.
       Fuse, 10 Amp Check, replace if   necessary.
       Fuse holder Check, replace if   necessary.
       Switch, oven power Check for line voltage supplied to switch. If no voltage is
     present, trace wiring back to fuse holder. Check continuity between switch terminals. Replace switch as needed.
       Motor, main fan Check for line voltage supplied to motor. If no voltage is
     present, trace wiring back to oven power switch. Check motor for opens, shorts or grounds.
     WITH POWER OFF: Turn fan blade to check for locked rotor.
No control box   cooling Incoming power supply Check circuit breaker, reset if required. Check power
     plug to be sure it is firmly in receptacle. Measure incoming power, call power co. if required.
       Fuse, 10 Amp Check, replace if   necessary.
       Fuse holder Check, replace if   necessary.
       Switch, oven power Check for line voltage supplied to switch. If no voltage
     is present, trace wiring back to fuse holder. Check continuity between switch terminals. Replace switch as needed.
       Cooling fan Check for supply voltage to the cooling fan. If no
     voltage is present, trace wiring back to the fuse holder. If voltage is present and motor does not run, check motor for opens shorts or grounds.
     WITH POWER OFF: Check for locked rotor.
No automatic control box cooling Incoming power supply Check circuit breaker, reset if required. Check power plug to be sure it is firmly in receptacle. Measure
     incoming power, call power co. if required.
       Cooling fan thermostat Check cooling fan thermostat (thermostat closes at
     120°F and opens at 100°F). With cooling fan thermostat pre-heated, check for continuity
Control box cooling fan
     continues to run
Cooling fan thermostat See “Cooling fan thermostat” (NOTE: Thermostat will
     remain closed if control box temperature remains above
     120°F.
Oven will not heat Main fan If not operating, refer to   “Oven fan will not run”
S/N N31348 and
     Below
Gas supply Check for adequate gas supply and be sure that the manual gas shut off valve is open. Also check flexible
     gas line connection.
       Air pressure switch Check air switch terminals for supply voltage to
     terminals NO2 and COM. If voltage is present on one side only, check for air tube blockage or misalignment. If these are okay, adjust air pressure switch or replace switch as needed.
       Oven cavity hi-limit thermostat Terminals are normally closed, opens at 350°C (660°F). If open, reset and test oven for proper operation. If thermostat will not hold for maximum temperature, and oven is not exceeding control setting, check for proper location of the capillary bulb in its spring holder. If above checks are okay, replace hi-limit thermostat.
       Gas pressure switch This switch is located inside the gas valve and should
     close when gas pressure is present.
               WITH POWER OFF: Remove 3 prong plug (on gas
     valve) and measure continuity between terminals 2 and
     3. If no continuity, check the following: Proper gas pressure supply to gas valve as marked on the oven specification plate. Check for proper adjustment of the
     gas pressure switch, 10 for Nat. gas, 27 for LP gas or
     4.5 for town gas. Check the filter in the gas valve for blockage or damage. If above checks are okay, but pressure switch is still not closed, replace gas valve.
       Ignition control Check for supply voltage to ignition control at terminal
     #1 and neutral. If no voltage is present, trace wiring back to gas pressure switch. If voltage is present, check for supply voltage to burner blower motor at terminal #6 and neutral.   If no voltage is present, wait 30 seconds, reset ignition   control, and re- try. If the above fails, replace ignition control.
       Burner reset switch Switch is normally open. Check to see that the switch
     closes when reset button is pushed. Replace as needed.
       Burner blower motor Check for supply voltage to burner blower motor. If no voltage is present, trace wiring back to the ignition
     control.
     WITH POWER OFF: Turn blower wheel to check for locked rotor.
     If supply voltage is present and motor does not run, replace burner blower motor.
       Burner blower motor air pressure switch Check for supply voltage switching to terminal   NO as the air pressure switch closes. Check for air tube blockage
     or misalignment, adjust air pressure switch. If the above fails, replace air pressure switch.
       Spark generator After a pre-purge time of 30 to 60 seconds after burner blower motor starts, check for supply voltage to spark
     generator. If voltage is not present, check burner reset switch. If voltage is still not present, replace ignition
     control. If voltage is present, visually check for spark at igniter.
       Igniter/sensor assembly Check for visible damage to the igniter/sensor assembly. If there is no visible damage to the components, and no
     spark, replace the spark generator. If there is visible damage to the igniter/sensor assembly, replace. Also
     check for frayed or damaged wires in burner tube.
       Gas valve Check for supply voltage to gas valve. If no voltage is
     present, check reset button. Check all connections for tightness. If there is still no voltage at the gas valve, replace ignition control. If there is voltage present, check for gas pressure at gas pressure tap located in gas piping. If there is no gas pressure, replace gas valve.
Flame will not   stay on Flame sensor Check for flame sensor operation, connect a digital multimeter   (capable of measuring DC microamps)
     between the flame sensor wire and terminal #1 on the ignition   control. Sensor current is to be 3 microamps,
     minimum. If these readings are not achieved, replace
     igniter/sensor assembly.   Also check for any type of damage to flame sensor wire and connections.
     NOTE: The DC microamp test must be conducted with the oven in low flame (bypass) operation.
       Power supply Set the temperature to the lowest temperature setting. If there is sufficient microamp current,   but the flame will
     not stay on, check for proper polarity of the power supply.
       Ignition control If there is sufficient microamp current, and there is proper polarity of the power supply, but the burner will
               not stay on, check the reset button for the ignition
     control. If the above check okay, replace ignition   control.
Oven will not heat
     S/N N31349 and
     Above
Main fan If not operating, refer to   “Oven fan will not run”
       Gas supply Check for adequate gas supply and be sure that the
     manual gas shut off valve is open. Also check flexible   gas line connection..
       Air pressure switch Check air switch terminals for supply voltage to
     terminals COM and NO. If voltage is present on one side only, check for air tube blockage or misalignment. If
     these are okay, adjust air pressure switch or replace switch as needed.
       Oven cavity hi-limit thermostat Terminals are normally closed, opens at 350°C (660°F). If open, reset and test oven for proper operation. If thermostat will not hold for maximum temperature, and oven is not exceeding control setting, check for proper location of the capillary bulb in its spring holder. If above checks are okay, replace hi-limit thermostat.
       Ignition control Check for supply voltage to ignition control at terminal
     #1 and neutral. If no voltage is present, trace wiring back to hi-limit thermostat. If voltage is present, check for
     supply voltage to burner blower motor at terminal #8 and
     neutral. If no voltage is present, wait 30 seconds, reset ignition control, and re- try. If the above fails, replace ignition   control.
       Burner reset switch Switch is normally open. Check to see that the switch
     closes when reset button is pushed. Replace as needed.
       Burner blower motor Check for supply voltage to burner blower motor. If no
     voltage is present, trace wiring back to the ignition control.
     WITH POWER OFF: Turn blower wheel to check for locked rotor.
     If supply voltage is present and motor does not run,
     replace burner blower motor.
       Burner blower motor air
     pressure switch
Check for air pressure switch to be switching from “NC”
     to “NO”. Check for air tube blockage or misalignment. Adjust air pressure switch. If the above fails, replace air pressure switch.
       Ignition control A pre-purge time of 30 to 60 seconds occurs after
     burner blower motor starts. Check for high voltage spark output from the ignition control. If there is no high
     voltage spark output, check reset button for the ignition control. If there is still no high voltage output, replace the
     ignition control.
       Igniter/sensor assembly Check for visible damage to the igniter/sensor assembly.
     If there is visible damage to the igniter/sensor assembly, replace. If there is no visible damage to the components, and no spark, replace the igniter/sensor assy. Also
     check for frayed or damaged wires in burner tube. Replace components as needed.
       Ignition control Gas valve should open as the ignition control generates
     the high voltage spark. Check for supply voltage to pilot valve at terminal #5 and neutral. If no voltage is present, check reset button for the ignition   control. If there is still no voltage to the pilot valve, replace ignition control.
       Gas valve Check for supply voltage to pilot valve terminal #5 to
     neutral, if there is no voltage, trace wiring back to ignition control. If there is supply voltage, connect a manometer to the pressure tap fitting on the gas valve. If
               there is voltage to the pilot valve, but there is no gas
     pressure, replace gas valve.
       Pilot tube Check for gas pressure at pilot tube. Disconnect pilot tube at burner and connect manometer. If there is no
     gas pressure, check for blockage in pilot tube. Repair or replace as needed.
       Pilot orifice If there is gas pressure at the pilot tube, check the pilot orifice for damage or obstructions. Replace pilot orifice
     as needed.
Flame will not   stay on Flame sensor To check flame sensor operation, connect a digital
     multimeter (capable of measuring D.C. microamps) between the flame sensor wire and the flame sensor connection on the ignition control (terminal #13). Flame sensor current is to be 0.7 microamps, minimum.   If these readings are not achieved, replace igniter/sensor assembly.   Also check for any type of damage to flame sensor wire and connections.
     NOTE: The D.C. microamp test must be conducted with the oven in low flame (bypass) operation.
       Power supply Set the temperature to the lowest temperature setting. If there is sufficient microamp current,   but the flame will
     not stay lit, check for proper polarity of the power supply.
       Ignition control If there is sufficient microamp current, and there is
     proper polarity of the power supply, but the burner will
     not stay lit, check the reset button for the ignition control. If the above test is okay, replace the ignition control.
       NOTE: Flame should be on at
     this time
        
Low flame is on, but no main flame Control transformer Check for supply voltage to primary of control transformer. If no voltage is present, trace wiring back to
     oven power switch. If voltage is present, check for
     24VAC at transformer   secondary. If there is primary voltage, but no secondary voltage, replace control transformer.
       Oven control Check for 24VAC supply to oven control. If no voltage is present, trace wiring back to control transformer. Check
     for supply voltage to oven control.   If no voltage is present, trace wiring back to ignition control. If voltage is
     present, check for a read-out on the display. If there is
     no read-out on the display, replace oven control. If there is a read-out on the display, set the oven control to maximum temperature (see installation operations manual for temperature adjustment). With the oven control at maximum temperature, check for supply voltage to the temperature regulation valve. If there is voltage at the temperature regulation valve, proceed to “Temperature regulation valve “. If there is no voltage at the temperature regulation valve, trace wiring back to
     the oven control. If there is no voltage output at the oven control, check the read-out on the oven control. If the oven control reads “PROBE FAIL” this indicates that the thermocouple has failed or become disconnected from the oven control
       Thermocouple Check to see that the thermocouple is securely
     connected to the oven control. If the thermocouple is connected to the oven control, and the display indicates “PROBE FAIL”, disconnect the thermocouple from the oven control and measure the resistance of the thermocouple. The thermocouple should read approx.
     11Ξ©. If these readings are not achieved, replace the thermocouple. If these readings are correct, proceed.
       Oven control If the thermocouple checks good, but the oven control
     display indicates that there is a thermocouple failure, replace the oven control. If the oven control indicates a temperature reading, but the oven will not heat, proceed.
       Thermocouple WITH POWER ON AND THERMOCOUPLE
     ATTACHED TO THE OVEN CONTROL: Measure the DC millivolt output of the thermocouple. Refer to the thermocouple chart (located in the “Removal” section of the manual) for proper millivolt readings. If these readings are not achieved, replace thermocouple.
       Oven control If the thermocouple checks good, but there is no supply
     voltage output to the temperature regulation valve, replace the oven control. If there is supply voltage output to the temperature regulation valve, proceed.
       Temperature regulation   valve Check for supply voltage to the temperature regulation
     valve. If voltage is present, listen for valve to open and close. Also check for opens or shorts in the operating coil. Replace temperature regulation valve as needed.
Intermittent   heating Thermal/overload of main fan
     and burner blower motor
The main fan motor and burner blower motor are
     equipped with internal thermal protection and will cease to operate if overheating occurs. As the motors overheat and cool, this will cause the heating system to cycle on and off intermittently.   Improper ventilation or lack of preventive maintenance may cause this problem. Also most of the problems listed under “Oven will not heat” can cause intermittent failure.
Conveyor will not   run Incoming power supply Check circuit breaker, reset if required. Check power plug to be sure it is firmly in receptacle. Measure
     incoming power, call power co. if required.
       Fuse, 10 Amp Check, replace if   necessary.
       Fuse holder Check, replace if   necessary.
       Switch, oven power Check for line voltage supplied to switch. If no voltage is present, trace wiring back to fuse holder. Check
     continuity between switch terminals. Replace switch as needed.
       Control transformer Check for supply voltage to primary of control transformer. If no voltage is present, trace wiring back to
     oven power switch. If voltage is present, check for
     24VAC at transformer   secondary. If there is primary voltage, but no secondary voltage, replace control transformer.
       Conveyor motor Check for supply voltage to the conveyor motor at
     terminal #6 to neutral. If no voltage is present, trace wiring back to oven power switch. If voltage is present, but the motor will not run, check the motor windings for opens or shorts. If any of the above checks fail, replace conveyor motor.
       Capacitor, conveyor motor Check for shorts or grounds. Replace capacitor as
     needed.
     WARNING: Capacitor has a stored charge, discharge before testing.
       Switch, conveyor reversing Check continuity   between switch terminals. Replace
     switch as needed.
       Oven control If there is voltage supplied to the motor, and the motor capacitor and reversing   switch check good, replace the
     oven control.
Conveyor motor runs,
     but there is no speed display
NOTE: Display will indicate
     “BELT JAM”
        
       Oven control Check for output voltage   from oven control to hall effect
               sensor (sensor is located in the conveyor motor).
     Measure voltage at the motor connector, red wire and yellow wire. Voltage should be approx. 10VDC. If no voltage is present, trace wiring back to oven control. If there is no voltage output at the oven control, replace oven control.
       Conveyor motor If there is voltage supplied to the hall effect sensor,
     check for a frequency output from the hall effect sensor. Measure frequency across the yellow and white wires in the motor connector. Frequency reading should be approx. 25-100 Hz. If these readings are not achieved, replace conveyor motor. If the readings are achieved, proceed.
       Oven control If the hall effect sensor readings are correct, but there is
     no speed indicated on the display, replace the oven control.
LETTER PART   NUMBER DESCRIPTION
A 369003 Door hinge
B 369110 Access window assembly
C 369337 Retainer (old style)
     369929 Retainer (new style)
D 369828 Handle spacer
E 369209 Latch & strike
F 369310 Screw, 6-32 x 3/16”
G 369308 Bottom, access window
H 369334 Access door glass
J 369309 Top, access window
K 350638 Handle
L 369311 Handle spacer (2 req.)
M 369336 Door latch
N 369906 Screw, 8-32 x 5/8”
O 370110 Door assembly (solid)
P 369157 Door assembly (with   window)
Q 1534 Finger support assembly
R 369057 Support bracket pin
S 369643 Strike assembly
T 1009 Oven top
U 369062 Top, control box
V 369140 Compression spring
W 369903 Washer, flat
X 369141 Conveyor hold down bracket
Y 369139 Shoulder screw
Z 369058 Baffle, inlet and outlet
* 369211 Thumb screw (not shown)
AA 369203 Stud, wing head
BB 369749 Chain cover kit (includes   AA, CC)
CC 369204 Split ring retainer
DD 369373 Receptacle, snap –in
EE 369748 Bracket, chain cover
FF 369328 Leg, stand
GG 369052 Adjustable leg
HH 369030 Caster, 6”
JJ 369904 Insulation holder assembly
KK 369053 Finger housing
LL     Columnating plates –
     see installation operations manual
MM 369055 Finger cover
NN 369218 Crumb pan, internal
OO 369926 Window frame, bottom
PP 369925 Glass, access window
QQ 369927 Window frame, top
LETTER PART   NUMBER DESCRIPTION
     369110 Access Door Assembly
A 371140 Bracket Assembly, Left
B 371142 Dowel, Access Door
C 370722 Screw
D 371143 8-32 x 3/8 Hx Serr Flng
E 371141 Bracket Assembly, Right
F 370725 Dowel Thread
G 371144 Access Door Frame (top or   bottom)
H 370723 Glass
LETTER PART   # DESCRIPTION
A 369062 Top, Control Panel
B 370355 Oven Control
C 370363 Front Cover Assembly
D 370354 Facia, Label
E 369432 Switch, On/Off
F 369580
     370433
Gas Valve, Multi Block (S/N N31348 & Below)
     Gas Valve (S/N N31349 & Above)
G 369570 Connector, 3 Pole
H 369571 Connector, 4 Pole
I 370186 Solenoid Valve
J 369072 Main Orifice, Nat.
   369099 Main Orifice, LP
   370114 Main Orifice, Town Gas
K 369144 Pilot Shield Extension
L 369202 Pilot Shield, Main
M 369076 Burner Igniter
N 369075 Flame Sensor
O 369142 Flame Target
P 370362 Thermocouple (Type K)
Q 369589 Blower Motor
R 369399 Air Shutter Assembly
S 369400 Shutter, MVB Air Plate
T 369158 Drive Sprocket
U 370373 Conveyor Motor
V 370359 Reversing Switch
W 369368 Thermostat, Hi-Limit
X 369378 Cooling Fan
Y 369507 Cooling Fan Thermostat
Z 369025 Blower Air Switch
AA 369575 Air Pressure Switch
BB 369192 Capacitor
CC 370360 Capacitor, Conveyor Motor
DD 369574 Spark Generator (S/N N31348   & Below)
EE 369579 Solid State Alarm
FF 370241 Transformer, Control
GG 369573
     370396
Ignition Control (S/N N31348 & Below) Ignition Control (S/N N31349 & Above)
HH 369331 Finger Guard
II 369073
     369100
Bypass Orifice, NAT
     Bypass Orifice, LP
Not shown 357107 Fuse holder
Not shown 369014 Fuse, 10 A.
LETTER PART   NUMBER DESCRIPTION
A 369808 Cover, motor (gas ovens)
    370140 Cover, motor (electric   ovens)
B 369214 Motor, main fan (50 Hz.)
C 369033 Motor clamp
D 369215 Motor support assembly
E 369192 Capacitor, 7.5 MFD
F 369306 Oven back assembly, gas   oven
G 369646 Stand-off
H 369647 Inlet panel
J 369213 Main fan
K 369547 Bracket, thermostat
M 369287 Heating element, 208V
    369315 Heating element, 220V
    369122 Heating element, 240V
LETTER PART   NUMBER DESCRIPTION
    369830 Complete conveyor assembly
A 369816
     369163
Conveyor belt, complete (30 inch wide belt)
     Conveyor belt, complete (32 inch wide belt)
    370092
     369362
Conveyor belt, 1 foot section (30 inch wide belt) Conveyor belt, 1 foot section (32 inch wide belt)
B 369825 Retaining ring
C 369813 Conveyor bearing block
D 369314 Roll, conveyor, notched
E 369812 Conveyor idler shaft
F 369160 Conveyor pan stop
G 369814
     369005
Connecting link (30 inch wide belt)
     Connecting link (32 inch wide belt)
H 369811 Conveyor drive shaft
J 369161 Roller chain sprocket
K 369806 Crumb pan
L 370050 Conveyor frame
M 369162 Drive chain

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