Bosch Evolution 300 Series User manual

The information provided in this document is intended for trained,
qualified personnel only. The proper function and the safety of the
appliance can be affected by an improper repair, and even serious
threats to life or physical condition may arise. BSH Home Appliances
Corporation is not liable for damages caused by improper repairs
performed by unauthorized parties. Local codes and standards apply
and must be observed. Contact the Technical Support Team for
further assistance.
SERVICE MANUAL
for
Bosch(YROXWLRQ
DQGSeries
Free-standing Gas Ranges
Models
HGS3023UC, HGS3053UC, HGS3063UC, and
HGS5053UC
58300000146087 ARA EN A

TABLE OF CONTENT6
1:1 GENERAL INFORMAT ION
1:1 Safe Servicing Practices - All Appliances
1:2 

1:4 Model Number Information
1:4 Explanation of Model Number and Feature Designators
1:4 Data Plate Location
1:5 Gas Cooktop Operation
1:5 Cooktop Configuration and Burner Specifications
1:6 Surface Burner Ignition Process
1:7 Surface Burner Flame Characteristics
1:8 Gas Oven Operation
1:8 Oven Burner Specifications
1:8 Oven Operating Temperatures
1:9 Oven Burner Cycling
1:9 Convection Fan Operation
1:9 Calibrating Oven / Temperature Offsets
1:10 Electronic Oven ontrol Operation
1:10 PowerUp Display
1:10 Service Diagnostic Mode
1:11 Relay and 
1:11 Temperature Sensor Operation and Testing
2:1 SERVICING THE RANGE
2:1 Surface Burners - 300 Series Ranges
2:2 Oval Burner - 500 Series Ranges
2:4 Surface Burner Orifices
2:5 Cooktop Removal
2:7 Surface Burner Igniters
2:8 Surface Burner ontrol Valves
2:11 urface Igniter Spark Module
2:12 Oven Bake Burner
2:14 Bake Burner Igniter
2:14 Bake Burner Orifice
2:15 Oven Broil Burner
2:16 Broil Burner Igniter
2:17 Pressure Regulator
2:18 Surface Burner Flame Adjustment
2:19 Oven Burner Flame Adjustment
2:20 Conversion from Natural Gas to LP Gas
2:24 Oven ontrol Module
2:24 Convection Fan Motor and Blade
2:26 Oven Temperature Sensor
2:27 Oven Door Latch
2:29 Oven Door and Hinges
GND
= GROUND
RTD
= RESISTANCE TEMPERATURE DEVICE
(Temperature Sensor Probe)
2:29 Removing the Door
2:30 Reinstalling the Door
2:31 Servicing the Door
3:1 TROUBLESHOOTING
3:1 Electronic Control Module Failure/Fault Codes - ES337
3:2 Fault Codes from Tech Sheet
3:5 Troubleshooting Tips
3:7 Electronic Control Module Troubleshooting and Testing
3:7 Gas Range Circuit Test Matrix - ES337
3:8 Gas Range Component Testing
3:8 Gas Range Component Resistance Chart
Terms and Abbreviations Used in this Manual

1:1
To avoid personal injury and/or property damage, it is important that Safe Servicing Practices be observed. The following are some limited examples
of safe practices:
1. DO NOT attempt a product repair if you have any doubts as to your ability to complete it in a safe and satisfactory manner.
2. Before servicing or moving an appliance:
• Remove the power cord from the electrical outlet, trip the circuit breaker to the OFF position, or remove the fuse.
• Turn off the gas supply.
• Turn off the water supply.
3. Never interfere with the proper operation of any safety device.
4. USE ONLY REPLACEMENT PARTS CATALOGED FOR THIS APPLIANCE. SUBSTITUTIONS MAY DEFEAT COMPLIANCE WITH
SAFETY STANDARDS SET FOR HOME APPLIANCES.
5. GROUNDING: The standard color coding for safety ground wires is GREEN, or GREEN with YELLOW STRIPES. Ground leads are
not to be used as current carrying conductors. It is EXTREMELY important that the service technician reestablish all safety grounds
prior to completion of service. Failure to do so will create a hazard.
6. Prior to returning the product to service, ensure that:
• All electrical connections are correct and secure
• All electrical leads are properly dressed and secured away from sharp edges, high-temperature components, and moving parts
• All non-insulated electrical terminals, connectors, heaters, etc. are adequately spaced away from all metal parts and panels
• All safety grounds (both internal and external) are correctly and securely connected
• All panels are properly and securely reassembled
• All gas connections are secure and have been leak tested
GENERAL INFORMATION
The information provided in this document is intended for trained, qualified personnel only. The proper function and the safety of the
appliance can be affected by an improper repair, and even serious threats to life or physical condition may arise. BSH Home Appliances
Corporation is not liable for damages caused by improper repairs performed by unauthorized parties. Local codes and standards apply
and must be observed. Contact the Technical Support Team for further assistance.
Safe Servicing Practices - All Appliances

1:2
PURGXFW OYHUYLHZDQG)HDWXUHV
Bosch 300 and 500 series freestanding gas ranges feature
sealed gas surface burners, continuous surface grates, self-
cleaning oven, electronic oven control, wide view oven window,
interior oven light, and a removeable storage drawer.
500 Series
HGS5053UC
500 series gas ranges feature an oval center surface burner while
300 series ranges have a round center surface burner. The oven
functions are controlled by the ES337 lectronic ven control module.
Current finish options available are hite, lackand lack with
tainless teel. All 300 and 500 series gas ranges operate on 120
volt 60 hz AC power supply.

1:3
The Bosch 300 series gas range uses an ES337 lectronic ven control
for all oven operations including Bake, Broil, Time Bake, Self-cleanand
Oven Lockout. The control module also features a countdown timer and
interior oven light control key.
 
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
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
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

300 Series (models without convection bake)
The Bosch 500 series range range lectronic ven control has all of
the features listed for the 300 series range except for Oven Lockout. In
place ot the Lock keypad found on the 300 series rangesthe Convection
keypad is found on these models.
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Both lectronic ven control styles also feature silent control
panel option, temperature conversion between °C (Celsius) or °F
(Farenheit), and useradjustable temperature calibration. More
detail on how these as well as other features are accessed and
controlled can be found in the 8VHDQG&DUH0DQXDO provided with
each range.
Electronic Oven Control Module

1:4
Model Number Information
The information contained in this service manual applies to the following
models:
HGS3023UC
HGS3053UC
HGS3063UC
HGS5053UC

Data Plate /RFDWLRQ
   R 
   
  

 
Explanation of Model Number and Feature Designators
2009 Bosch Evolution Series Free Standing Range (FSR)Data Tag Formats
Initial Production July 2009
▪ Model number truncated (HGS3023U1=HGS3023UC/01)
▪ FD number not identified
(Convert using positions 3-5 of serial number; 906=FD 8906)
Implemented Early September 2009
▪ Model number truncated (HGS3023U1=HGS3023UC/01)
▪ FD number printing, but not identified with “FD”
Implemented mid-October 2009
▪ Model number in standard format
▪ FD number printing and identified
The format of the data tags used on the following FSRs has changed since the
beginning of production for the following models:
HGS3023UC


Product designator
H = Range
Fuel Type designator
E = Electric
G = Natural Gas
D = Dual Fuel
Model Type designator
S = Solo / Freestanding
Color Designator
2 = White
5 = Stainless Steel
6 = Black
Counter Designator
For visible model
changes
Series designator
30 = 300
50 = 500
80 = 800
H G S 5 0 5 3 U C 1 or 01
Market designator
U.S and Canada
Customer Service
Index No
(K I)
Explanation of FD NXPEHU
The FD number indicates production year and month. On some data
plates, it is incorporated in the serial number (i.e, 99906008803 . . . =
FD8906). On other data plates, the FD number is printed below and to
the right of the model number.  
Before calling for service assistance, be prepared to provide the
complete model number and FD number reflected on the data plate.
Examples are shown below.

1:5
Gas Cooktop Operation
Cooktop Configuration and Burner Specifications
300 Series gas ranges are equipped with five sealed-type surface
burners with electronic spark ignition. Surface burner sizes on the 300
series are 12,0009500 (2)5000 14,200 BTU. The illustration at
right shows the cooktop layout, burner configurationand BTU rating of
each surface burner location.
300 Series Cooktop
500 Series Cooktop
500 Series gas ranges are equipped with five sealed-type surface
burners with electronic spark ignition. Surface burner sizes on the 500
series are 12,0009500 (2)5000 16,000 BTU. The center burner of
the 500 series range is an elongated oval burner ideal for using griddles
or other oblong cookware. The illustration at right shows the cooktop
layout, burner configuration, and BTU rating of each surface burner
location.
12k
9.5k
9.5k
5k
14.2k
12k
9.5k
5k
16k
9.5k

1:6
Gas Cooktop Operation
Surface Burner Ignition Process
The ignition process of the surface burners on the 300 series and
500 series ranges is identical. Each surface burner is independntly
operated and controlled by a gas valve attached to a common manifold
pipe. The shaft of the valve extends through the front of the manifold
panel located just above the oven doorand a knob is installed on the
shaft.
OFF . . . LITE . . HI . . . . . . . . . . . LO
LITE Position Indicator



  





To operate any surface burnerthe knob must first be pushed inward
before it can be rotated. When the knob is rotated counterclockwisethe
valve opens to allow gas to flow to the burner and activatethe electronic
spark modulewhich generates the spark to light the gas.
In order for the burner to light properlythe knob must be stopped at the
LITE position indicated on the knob by the lightning bolt graphic shown in
the illustration at right. If the knob is rotated beyond the LITE positionno
spark is generatedand the burner will not ignitehowevergas will continue
to flow to thesurface burner.

Whenever any surface burner control knob is rotated to the LITE
positionthe spark module will generate a spark at all surface burners
simultaneouslyeven if other burners have already been lighted.
Activation of the spark module is accomplished by means of a switch
that fits onto each surface burner control valve as seen in photo A below.
As the valve is rotatedthe switch cam is rotated.
The surface igniter switches are assembled in a continuous harness
and wired in a parallel circuitallowing any one of them to activate the
spark module. If one switch is defectivethey must all be replaced as an
assembly.
In the illustration abovethe eft Rear surface igniter switch is rotated
to the LITE positionclosing the contact in the switchand supplying L1
voltage to the spark module. The module fires all surface burner igniters
at the same time.
IGNITER SWITCHES
Photo A

1:7
Surface Burner Flame Characteristics
A properly operating burner will have clean blue flames with no yellow
tipping, excessive noiseor lifting away from the burner head. Photo B
atright illustrates a typical flame at high setting.
Yellow flames indicate improper fueltoair ratio and can be caused by
improper gas pressure, improper conversion for use with LP gasor
contaminated fuel supply. 6XUIDFH%XUQHU)ODPH$GMXVWPHQW
 
Photo
B

1:8
Oven Operating Temperatures
*DV2YHQ2SHUDWLRQ
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300 and 500 Series ranges have identical bake and broil burner ratings
as listed in the chart below. Note that the oven burnr BTU rating
decreased when the range is used on LP gas.


Gas
Burner
Ratings
(Natural/Liquid Propane)
Bake
Burner 18,000 BTU /16,000 BTU
Broil
Burner 13,500 BTU /13,500 BTU 



The oven can be programmed to bake at any temperature from 170°F to
550°F (77°C to 287°C).
When broiling, the oven control has two selectable preset ranges, HI and
LO. When broiling on the HI setting, the maximum oven temperature is
550°F. When broiling on the LO setting, the maximum oven temperature
is 350°F.
In self-clean mode, the oven target temperature average is 825°F. The
actual oven temperatures will fluctuate between 810°F and 840°F during
the self-clean cycle to achieve this average temperature.
A
fter self-clean is completed, the oven door will remain locked until the
internal oven temperature is below 500°F.

1:9
2ven Burner Cycling
When a Bake cycle is programmedonly the bake burner is used. (This
includes the Preheat cycle.)
When the bake cycle begins in a cold oventhe control will initiate a
Preheat operation. This is indicated by the illumination of the Preheat
indicator light on the control panel in addition to the Oven indicator light.
During preheatthe oven temperature will exceed the selected bake
temperature by a wide marginthen cool down a few degrees below the
set point. This process may happen more than once and is based on a
formula that is programmed into the control.

Average preheat time from cold start to 350°F is 12 15 minutes.
When preheating is completethe Preheat indicator light will go out
and the control will beep to signalthat the food can be put into the oven.
During the course of a typical bake cyclethe oven control will cycle the
bake burner on as required to maintain an average oven temperture
near the selected bake temperature. When set to bake at 350°F, it is
common to see oven temperature swings from 325°F to 375°FThe
frequency of this cycling will depend on many factorsincluding the food
being cooked, ambient air temperature, frequency of door opening, etc.
It should be noted that the Oven indicator light will glow when the burner
is turned on and will go out when the burner is turned off.
When a Broil cycle is  only the broil burner is used. The
oven control will keep the broil burner on until the maximum temperature
has been reached for the broil level selected on the oven control. 550°F
for HI°F for LO. There is no preheat operation for the  cycle and
the

Convection Fan Operation
500Seriesgasrangesfeatureconvectionbakingthatutilizesa
convectionfantocirculateairthroughouttheovencavityduring
bakingfor faster, more even baking results. Theconvectionfanwill
notoperateduringthefirstsixminutesofpreheatinorderto
allowproperventingofovenexhaustgases.Aftertheovenhas
heatedforsixminutesandthefanhasbeguntooperate,itwill
remainonduringtheentireconvectionbakecycleunlessthe
ovendoorisopened.Whenthedoorisclosed,thefanwill
resumerunning.
Calibrating Oven / Temperature Offsets
Oven performance can be customized to suit the preferences of the
individual consumer by programming a temperature offset into the
control. The oven temperature should be tested prior to making any
calibration adjustments.
To test oven temperature, set the electronic control for normal baking at
350°F. After the oven has completed the preheat cycle, obtain an
average oven temperature after a minimum of five cycles. Press
CANCEL or CLEAR to terminate Bake mode.
If necessary, the oven can be adjusted a maximum of +35°F higher or
-35°F lower than the factory default 0 setting by following the steps
below.
Note: Changing calibration affects all baking modes but will not affect
the self-clean temperature.
To calibrate oven temperature:
1. Press BAKE.
2. Set the temperature to 550°F (287°C) by pressing and holding the +
key.
3. Within two seconds, press and hold the BAKE key until the 2-digit
display appears, then release the BAKE key. The display now indicates
the number of degrees offset between the original factory temperature
setting and the current temperature setting. If the oven control has the
original factory calibration, the display will read 0.
4. Adjust the temperature up or down in 5° increments by pressing and
holding the + or - key. Adjust until the desired offset appears in the
display. When lowering the oven temperature, - will appear before the
number to indicate that the oven will be cooler by the displayed number
of degrees.
5. When the desired offset has been entered, press CLEAR/OFF to
return to time-of-day display.
Note: If the oven is extremely hot from use or testing, the control may
not readily go into the calibration / temperature offset mode. If this
occurs, open the oven door to allow cooling for 5-10 minutes, then retry.

1:10
Electronic Oven &ontrol Operation
When the appliance is first plugged in, or when the power supply to the
appliance has been interrupted, the display will flash .
To set the clock:
1. Press &/2&. once (do not hold pad down).
2. Within 5 seconds, press and hold or until the
desired time of day appears in the display.
Note: The clock cannot be changed during any timed ake
or elf-clean cycle.
 







 








2
1
In addition to the ailure/ault odes that are built into the control
ervice ode can be activated to monitor the oven temperature as
reported by the oven sensor to the control. This mode may be useful
when using a thermometer to test oven temperature since it will allow
the technician to monitor the temperature recorded by the thermometer
and compare it to the temperature reported by the sensor probe.
To enter ervice odeunplug or turn off the power to the range.
While holding the C keypad downrestore power to the range.
The control will now show the internal oven temperature that is being
reported by the sensor.

 







PowerUp Display
Service Diagnostic Mode
 







 








To exit Service Mode, press the CLEAR/OFF keypad or disconnect
power to the range.
Note: If the oven cavity temperature reaches 500°F, during Self-clean,
the door will remain locked until the oven cools below 500°F.

1:11
The accompanying chart can be
used to test the resistance of the
oven temperature sensor probe.
For accura testinguse a high
quality thermometer or temperature
meter to determine actual oven
temperature before reading the
resistance of the probe.
Temperature Sensor Operation and Testing
RTD SCALE
Temperature (°F) Resistance (ohms)
32 ± 1.9 1000 ± 4.0
75 ± 2.5 1091 ± 5.3
250 ± 4.4 1453 ± 8.9
350 ± 5.4 1654 ± 10.8
450 ± 6.9 1852 ± 13.5
550 ± 8.2 2047 ± 15.8
650 ± 9.6 2237 ± 18.5
900 ± 13.6 2697 ± 24.4
Probe circuit to case ground Open circuit / Infinite Resistance
Relay and 3OXJ&RQQHFWLRQV
The oven temperature is monitored by the lectronic ven control
through the emperature ensor located inside the oven cavity. The
sensoror RTD as it is sometimes calledincreases its resistance as the
surrounding air temperature increases. The oven control interprets any
increase in the resistance of the sensor circuit as an increase in oven
temperature. If the wires or harness connections between the control
and the sensor are loose or otherwise defectivethe resistance detected
by the control may be much higher than the actual sensor resistance. In
some casesthis can cause a false error message to be displayed on the
control such as F10 or F30.
Before assuming that a sensor is defectivetest the sensor resistance
through the wire harness that attaches to the control. Disconnect the
wires from the control and test with an ohmmeter. Normal resistance
at room temperature is approximately 1091 ohms. If the resistance is
correct for the temperature listed in the chart belowthen the sensor is
good and should not be replaced.

 
RELAY AND PLUG CONNECTION LOCATIONS ON
500 SERIES GAS RANGE CONTROLS
Bake
Broil
L1
N
Sensor
Motor Door Lock
Oven Light
Door Switch
Lock Motor Switch & Door Switch
Lock Motor Switch
Convection Fan Motor



RELAY AND PLUG CONNECTION LOCATIONS ON
300 SERIES GAS RANGE CONTROLS
Bake
Broil
L1
N
Sensor
Motor Door Lock
Oven Light
Door Switch
Lock Motor Switch & Door Switch
Lock Motor Switch

2:1
SERVICING THE RANGE
Surface Burners - 300 Series Ranges
The surface burners on the 300 Series range are secured to the cooktop
by two screws. Photo A at right shows the five burner model with grates
removed and burner caps in place.
Photo C
Photo A
Photo B
Photo D
To remove and replace any of the burnersfirst lift off the burner caps as
seen in photo B.
Using a 3/16” nut driverturn the screws counterclockwise to remove as
shown in photo C
The burner can then be lifted away from the cooktopproviding access
to the mounting screws for the rifice older ssembly, igniter tipand
burner orificeas seen in photo D.

2:2
Oval Burner - 500 Series Ranges
The surface burners on 500 series gas ranges are the same as those on
the 300 series ranges with the exception of the center oval burner shown
in photo A.
This burner has a decorative cap that can be removed but is not a
serviceable item. The cap and burner are replaced as an assembly.
Photo A
Photo B
The oval burner can be lifted off to access the orifice holder and orifice
without removing any screws. Once the burner is removedthe orifice
holder and igniter tip are visible. The orifice can be servicethrough the
hole in the orifice holder assembly (hoto B)

2:3
Photo C shows the oval burner removed from the range and the cap
removed from the burner. Photo C
Photo D
The top plate on the burner can be removed by taking out the two
screws seen in photo D from the underside of the burner.
With the top plate seprated from the burnerthe interior of the burner
and plate are accessible for cleaning in the event they should become
clogged from boilovers or other types of food spills (hoto E)
Photo E

2:4
Surface Burner Orifices
With the surface burner removedthe burner orifice can be accessed for
cleaning, replacementor for LP onversion.
The surface burner orifice can be removed using a 7mm socket wrench
or nut driver.
Orifice
Each orifice has a retaining ring to help prevent the orifice from falling
out of the nut driver as it is being lifted out of the orifice holder assembly.
Take care to ensure that the retaining ring is seated inside the nut driver
when reinstalling the orifice.
With the orifice removedthe size stamp is visible. The size stamp can
be used to determine if the proper orifice size is being used for a specific
burner.
Orifice Size
Stamp
Retaining
Ring
The following chart can be used as a guide to identify the proper orifices
for the various burner sizes and styles that are currently used on the
300 and 500 series ranges. Future models may changeso you should
always refer to the parts list for the specific model being serviced.
%785DWLQJ6W\OH   2YDO   
NaturalGas Orifice 1.07 1.46 1.54 1.67 1.87 1.98
LP Gas Orifice .66 .93 .89 1.02 1.09 1.18
LP Orifice Marking
Color
Pink White None Yellow Brown Silver
BTU Rating after LP
Conversion
5000 9500 8000 12000 14000 16000

2:5
The cooktop must be removed to access the surface burner igniter
orifice holder assemblies, burner valves, spark moduleand other
components. To remove the cooktopbegin by removing the burner caps
and surface burners as previously described.

Nextusing a 1/4 inch socket wrench or nut driverremove the screws
that secure each orifice holder assembly to the cooktop. The arrows in
hoto A at right indicate the screw locations for the leftfront orifice holder
assembly. Remove all screws at all burner locations before attempting to
remove the cooktop.
After the screws are removedinsert a putty knife or similar tool between
the bottom edge of the cooktop and the manifold panel  
shown in photo B. Push in on the putty knife to release the lock
clip that holds the cooktop down. The corner of the cooktop can be easily
liftedwhen the clip is released. Repeat this step on the opposite side.
Photo C shows detail and location of the cooktop lock clip.
Cooktop Removal Photo A
Photo B
Photo C
3 Inches

2:6
Carefully lift the cooktop aproximately 4 inchesmaking sure that the
orifice holder assemblies are released from the top as seen in photo A.
Pull the cooktop forward to disengage the rear edge from the tab of the
chassis support bracketand lift it away from the range.
Chassis Support
Bracket Tab
(Right Side)
Photo A
Photo B
When reinstalling the cooktop, engage the rear edge under the
chassis support bracket tabs seen in photo B, then press the front
edge down to engage the front locking clips.

2:7
Photo C
With the cooktop removedthe orifice holder assemblies and igniters are
accessible as seen in photo C. The surface burner igniter is part of the
orifice holder assembly and is replaced as a complete unit.
Surface Burner Igniters
Depress Tab
To Release
Photo D
After removing the cooktopdisconnect the gas line the
surface burner control valve to the orifice holder assembly being replaced
by first disconnecting the wire from the spark module to the igniter. The
wire terminal is a lockingtype terminal as seen in photo D. To disconnect
the wireLUVWGHSUHVVWKHORFNLQJWDEthen pull the wire off the spade
terminal on the igniter.

Note: Failure to depress the locking tab before disconnecting the
igniter wire may reduce subsequent locking strength by as much
as 80%.