Bartscher C5230 User manual

C5230 / 206782
C4430 / 206873
C6640 / 206797
V1/1212

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1. General information................................................................................................ 30
1.1 Information about the instruction manual ............................................................ 30
1.2 Key to symbols.................................................................................................... 30
1.3 Liability and Warrantees...................................................................................... 31
1.4 Copyright protection............................................................................................ 31
1.5 Declaration of conformity..................................................................................... 32
2.Safety ........................................................................................................................ 32
2.1 General information............................................................................................. 32
2.2 Safety instructions for use of the device.............................................................. 32
2.3 Intended use ....................................................................................................... 33
3. Transport, packaging and storage......................................................................... 34
3.1 Delivery check..................................................................................................... 34
3.2 Packaging ........................................................................................................... 34
3.3 Storage................................................................................................................ 34
4. Technical data ......................................................................................................... 35
4.1 Overview of parts ................................................................................................ 35
4.2 Technical specification........................................................................................ 36
5. Installation and operation....................................................................................... 37
5.1 Instructions for the installer ................................................................................. 37
5.1.1 Preparation.............................................................................................. 37
5.1.2 Place of installation ................................................................................. 38
5.1.3 Preparing to Install .................................................................................. 39
5.1.4 Power supply connection......................................................................... 40
5.1.5 Water connection .................................................................................... 42
5.1.6 Water outlet (206782, 206797)................................................................ 43
5.1.7 Steam outlet vent .................................................................................... 43
5.2 User’s instruction................................................................................................. 44
5.2.1 Safety precautions................................................................................... 44
5.2.2 First use................................................................................................... 45
5.2.3 Standard maintenance ............................................................................ 46
5.2.4 Special maintenance............................................................................... 48
5.3 Control panels..................................................................................................... 51
6. Waste disposal........................................................................................................ 56
Bartscher GmbH
Franz-Kleine-Str. 28
D-33154 Salzkotten phone: [phone]
Germany fax: [phone]
Keep this instruction manual
ready to hand at the product!
GB/UK

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1. General information
1.1 Information about the instruction manual
This instruction manual contains information about the installation, operation and
maintenance of the device and should be consulted as an important source of
information and reference guide.
Awareness of the safety instructions and instructions for use in this manual will ensure
the safe and correct use of the device.
In addition to the information given here, you should comply with any local Health and
safety Controls and generally applicable safety regulations.
The instruction manual forms part of the product and should be kept near the device
and easily accessible for anyone carrying out the installation, servicing, maintenance or
cleaning.
1.2 Key to symbols
In this manual, symbols are used to highlight important safety instructions and any
advice relating to the device. The instructions should be followed very carefully to avoid
any risk of accident, personal injury or material damage.
WARNING!
This symbol highlights hazards, which could lead to injury.
Please follow the instructions very carefully and proceed with particular attention
in these cases.
WARNING! Electrical hazard!
This symbol draws attention to potential electrical hazards. If you do not follow
the safety instructions, you may risk injury or death.
CAUTION!
This symbol highlights instructions, which should be followed to avoid any risk of
damage, malfunctioning and/or breakdown of the device.
NOTE!
This symbol highlights tips and information, which have to be followed for
an efficient and trouble-free operation of the device.
WARNING! Hot external surface!
This symbol is a warning that the device surface is hot when in use. Ignoring this
warning may result in burns!

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WARNING! The container holds hot liquid!
When containers hold liquid or products that turn liquid during cooking, do not
higher shelves to place the containers so that the operator can always look into
the container inside.
1.3 Liability and Warrantees
All the information and instructions in this manual take into account standard safety
regulations, current levels of technical engineering as well as the expertise and
experience we have developed over the years.
The instruction manual was translated with all due care and attention. However, we do
not accept liability for any translation errors. The German version of this instruction
manual is definitive.
If the delivery consists of a special model, the actual scope of delivery may differ from
the descriptions and illustrations in this manual. This is also the case for special orders
or when the device has been modified in line with new technology. If you have any
questions, you should contact the manufacturer.
NOTE!
Read the instruction manual carefully before using the device. The manufacturer
does not accept liability for any damage or malfunction resulting from not
following the instructions for use.
The instruction manual should be kept near the device, easily accessible for anyone
wishing to work with or using it. We reserve the right to make technical changes for
purposes of developing and improving the useful properties.
1.4 Copyright protection
The instruction manual including any texts, drawings, images or other illustrations is
copyright. No part of this publication may be reproduced, transmitted or used in any
form or by any means without permission in writing from the manufacturer. Any person
who commits any unauthorized act in relation to this publication shall be liable to claims
for damages. All rights reserved.
NOTE!
The contents, texts, drawings, pictures and any other illustrations are copyright
and subject to other protection rights. Any person unlawfully using this
publication is liable to criminal prosecution.

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1.5 Declaration of conformity
The device complies with the current standards and directives of the EU.
We certify this in the EC declaration of conformity.
If required we will be glad to send you the according declaration of conformity.
2.Safety
This section provides an overview of all important safety aspects.
In addition every chapter provides precise safety advice for the prevention of dangers
which are highlighted by the use of the above mentioned symbols.
Furthermore, attention should be paid to all pictograms, markers and labels on the
device, which must be kept in a permanent state of legibility.
By following all the important safety advice you gain an optimal protection against all
hazards as well as the assurance of a safe and trouble-free operation.
2.1 General information
This device is designed in accordance with the presently applicable technological
standards. However, the device can pose a danger if handled improperly and
inappropriately.
Knowing the contents of the instruction manual as well as avoiding mistakes and thus
operating this device safely and in a fault-free manner is very essential to protect
yourselves from the hazards.
To prevent hazards and to ensure optimum efficiency, no modifications or alterations to
the device that are not explicitly approved by the manufacturer may be undertaken.
This device may only be operated in technically proper and safe condition.
2.2 Safety instructions for use of the device
The specifications regarding the industrial safety are based on the Regulations of the
European Union applicable at the time of manufacturing the device.
If the device is used commercially, the user is obliged to ensure that the said industrial
safety measures concur with the state of the rules and regulations applicable at the time
in question for the entire period of use of the device and to comply with the new
specifications.
Outside the European Union, the industrial safety laws applicable at the place of
installation of the device and the regional territorial provisions must be complied with.
Besides the industrial safety instructions in the instruction manual, the general safety and
accident prevention regulations as well as environment protection regulations applicable
for area of application of the device must be followed and complied with.

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CAUTION!
oThe device is not intended for use by individuals (including children) with physical or
mental disabilities, insufficient experience, and/or insufficient knowledge unless such
persons are under the care of a person responsible for their safety or have received
instructions regarding appropriate use of the device.
oChildren should be observed to ensure that they are not playing with the device.
oPreserve this manual safely. When passing on/selling the device to a third party, the
manuals must be handed over along with the device.
oEvery person using the device must act in accordance to the manuals and under
consideration of the safety advice.
oThe device is to be used indoors only.
2.3 Intended use
CAUTION!
This device has been designed and built for commercial use only and should be
operated by qualified personnel only.
Safe operation is only guaranteed when using the device for its intended purpose.
Any technical interventions, as well as assembly and maintenance are to be made by a
qualified customer service only.
This convection oven is intended only for the following purposes:
-baking fresh and frozen confectionery products and bread;
-heating fresh and frozen food products;
-steam cooking of vegetables, meat and fish;
-the option of sous-vide cooking may be used only with an adequate plastic bag;
-maintaining the temperature of chilled and frozen meals.
CAUTION!
Any use going beyond the intended purpose and/or any different use of the
device is forbidden and is not considered as conventional.
Any claims against the manufacturer or his authorized representative as a
consequence of experiencing damages resulting from unconventional use are
impossible.
The operator is liable for all damages resulting from inappropriate use.

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3. Transport, packaging and storage
3.1 Delivery check
Please check the delivery upon completeness and transport damage immediately
after receipt. In case of visible damage do not accept or accept the delivery with
reservation only.
Note the extent of damage on the carrier’s bill of delivery. Trigger off the complaint.
Hidden damages should be reclaimed immediately after notice, as claims for damages
can only be asserted within the effective period for complaints.
3.2 Packaging
Please do not throw away the covering carton of your device as it might be useful for
storage purposes, when moving or, in case of damages, when the device must be sent
back to a repair center. The outer and inner packing material should be removed
completely from the device before installation.
NOTE!
If you liked to dispose the packing, consider the regulations applicable in your
country. Supply re-usable packing materials to the recycling.
Please inspect the device upon completeness. In case any part is missing please
contact our customer service center immediately.
3.3 Storage
Keep the package closed until installation and under consideration of the outside
indicated positioning- and storage markings.
Packages should be stored under consideration of the following:
-Do not store outdoors.
-Keep it dry and dust-free.
-Do not expose it to aggressive media.
-Do not expose it to direct sunlight.
-Avoid mechanical shocks and vibration.
-In case of longer storage (> 3 months) make sure you check
the state of the packaging and the parts regularly.
If required refresh or renew.

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4. Technical data
4.1 Overview of parts
①
Fan
⑥
Height adjustable feet
②
Housing
⑦
Cooking chamber
③
Cooking chamber lighting
⑧
Shelves for GN containers
④
Control panel
⑨
Convection oven door
⑤
Safety lock device
⑩
Door handle
Safety features
The safety lock device (microchip) interrupts the operation of the oven in the event of
its opening: both the heating system and the blower will shut off.
①
②
③
④
⑤
⑥
⑧
⑦
⑨
⑩

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4.2 Technical specification
Name
Electric convection ovens
Model:
C 4430
Model:
C 4430
Article No.
206873
Article No.
206873
Version
with grill and
direct steam
injection
Version
with grill and
direct steam
injection
Capacity:
4 (442 x 325 mm)
Capacity:
4 (442 x 325 mm)
The distance between
the trays:
75 mm
70 mm
75 mm
Temperature range:
0 ° C - 280 ° C
Timer range:
0 - 120 minutes
Dimensions
(W x D x. X H mm):
550 x 620 x 520
Dimensions
(W x D x. X H
mm):
550 x 620 x 520
Power supply
3.1 kW / 230 V
50-60 Hz
ready to connect
Power supply
3.1 kW / 230 V
50-60 Hz
ready to connect
Water connection:
G3 /4 "
Water pressure:
up to 2 bar
Weight
29.6 kg
Weight
29.6 kg
Accessories:
1 hydraulic hose
4 GN containers
442 x 325 mm
4 GN containers
442 x 325 mm
We reserve the right to make technical changes!
Properties of the convection oven
Design: stainless steel inside and outside
Interior lighting
Double glass door, easy to open internal door
Rounded baking chamber walls ensure simple, fast and effective cleaning
Direct steam injection

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5. Installation and operation
5.1 Instructions for the installer
CAUTION!
Any works related to the installation, connection and maintenance of the device
may only be carried out by a qualified and licensed technician in accordance with
the applicable international, national and local regulations.
Instructions
Read this instruction manual carefully before installing and starting the device.
At all stages of the installation, assembly, operation and maintenance, the works
should be performed by qualified personnel who meet the requirements for
professional training (approved by the manufacturer or vendor), and taking
into account the applicable legislation of the country of installation and
regulations on product safety and safety at work.
Do not use any accessories or spare parts that are not recommended by the
manufacturer. They may result dangerous to the user, cause damage to the oven or
lead to personal injuries; moreover, the use of such accessories and spare parts will
void the warranty.
Periodically, check that the power cord is not damaged. Do not use the appliance if
the power cord is damaged. If the power cord is damaged it must be replaced by a
serviceman or a qualified electrician in order to avoid any hazards.
Improper installation, operation, maintenance or cleaning, and any changes or
modifications may lead to malfunction, damage or injuries.
The manufacturer disclaims any liability for damage to persons or property caused
by the failure to comply with these rules or due to the user’s tampering of any
components of your appliance and failure to use the original spare parts.
5.1.1 Preparation
Immediately after receiving the appliance, make sure that it has not been damaged
in transit, and that the packaging is not damaged. In the case of damage or missing
components, immediately notify the shipper or vendor/manufacturer providing the
article and serial numbers (nameplate is on the back of the unit) and attaching
photo evidence.

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Make sure that you will have access to the installation site and will not have
problems to pass through doors, corridors, or other passages.
NOTE: During its shipment the unit may get overturned which may cause damage to
property or people as well as pose some difficulties. Please use a means of
transport appropriate to the weight of the device. Never pull or tilt the device; it
should be raised vertically from the ground and moved horizontally.
5.1.2 Place of installation
The device should be placed indoors (never outdoors!) In a well ventilated room.
Prior to positioning the convection oven, check its dimensions and exact location of
the power and water connections, and of the exhaust duct.
It is recommended to place the oven under a kitchen hood outlet or provide the
outflow of hot vapours and fuses from the cooking chamber outside of the building
The convection oven must be placed on an even surface to prevent its slipping or
tipping.
The place of installation of the convection oven must support the weight of the unit at
full load. Its gross weight can be found on the nameplate at the back of the
convection oven.
If the ovens are placed above proofers,
stainless steel tables or other ovens it is not
advisable to use the upper surface to insert
the GN containers so that the user could
look into the containers.
For safety reasons, once you place your
oven, attach this sticker to the device
“Danger of burns”, which is provided in the
package, on the convection oven at a height
of 1600 mm from the floor (see Figure on the
right).
Make sure that the oven position allows for complete opening of its door (180°)
Position the oven so that its back is easily accessible to enable the connection of
water and power supplies and its maintenance.
The device is not suitable for external housing; it is necessary to keep a minimum
distance of 5 cm from all sides.
The oven shall never be placed near heat sources, fryers or other sources of hot
liquids; in case it is not possible to meet this requirement, the safe distance is 50 cm
from the sides and top of the oven, and 70 cm at its rear.

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Never place the oven near combustible materials or containers made of flammable
materials (such as walls, furniture, partitions, gas cylinders) since it could lead to a
fire hazard. In case it is not possible to meet this requirement, cover the flammable
components with non-flammable thermo-insulating material, and follow the fire
regulations strictly.
5.1.3 Preparing to Install
Remove the outer packaging (wooden box and/or cardboard) and dispose of them in
accordance with the regulations in force in the country of installation.
Remove the protective film
Remove the protective film completely from the
external and internal walls.
Remove any accessories, informational materials and
plastic bags from the oven.
Adjusting the feet
CAUTION!
Do not use the oven without the feet.
When the oven is used without the feet, the air flow
needed to cool digital components and external
walls is not provided, and this can cause
overheating and damage to the oven.
The adjustable feet are attached with the packed
unit and must be screwed to the oven.
The correct flat position of the oven ensures its trouble-free operation. Such position
is achieved by adjusting the feet and checking it with a spirit level. To adjust the feet,
simply tighten or loosen them.

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Attaching the drip tray
The drip tray is used to collect liquids which
may flow out through the front door of the
oven. Place the tray in front of the oven and
fasten it with screws found in a bag provided
in the package. The screws are screwed into
the threaded inserts in the lower front part of
the oven (Figure on the right).
Attaching the drip tray drain
Fit a plastic closure and a white water drain
hose which is found in the package. Make
sure that the hose is installed and fixed in
such a way as to allow the water to properly
drain from the drip tray to the sewage network
(Figure on the right).
5.1.4 Power supply connection
WARNING! Danger of electric shock!
In the case of improper installation the device may cause injuries!
Before the installation compare the local power grid parameters with the
parameters of the oven power supply (see the nameplate). The oven can be
powered only when these data are consistent!
Before connecting to the power grid, make sure that the voltage and frequency
indicated on the nameplate correspond with those of the local power grid.
The allowable deviation in voltage is ± 10%.
When the device does not have wheels to facilitate its movement we recommend to
connect the device to the power supply first, and then position it in its workplace.

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Make sure the power cord does not get damaged when moving the oven. This way
the oven will be connected to the power supply without difficulty and in a more safety
manner. The power cord shall be placed so that it does not reach the ambient
temperature higher than 50°C at no point.
Convection oven with a single-phase power cord and plug (206873)
For units equipped with a cord and plug (single phase, 230 V), simply insert the
plug into the appropriate socket (the socket must match the provided plug and
withstand the load required for the oven and specified on the nameplate).The device
must be positioned so that the plug is easily accessible at all times.
The oven is supplied with a certified cord and plug: do not tamper them or change
anything in them.
Convection oven with a three-phase power cord and no plug (206782, 206797)
CAUTION: in the connecting power cord, the yellow/green wire should be at
least 3 cm longer than the other wires.
The convection oven should be connected directly to the power grid and provided
with a previously connected and easily accessible switch installed in accordance
with the applicable international, national and local regulations. This switch should
have a contact opening for all poles in order to ensure a complete shutdown in case
of over-voltage of category III
It is essential to properly connect the earth wire which cannot be disconnected under
any circumstances by the protective switch.
Make sure, before connecting the oven to the power grid, that all the power cords
are securely connected.
Also take into account connections prepared for individual devices; they can be
found on the back of the oven
Yellow/green: The protective wire "EARTH".
Blue: Neutral wire
Brown, gray, black: live wires

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Connection to the equipotential bonding system
This connection should be made between different devices with the use of a plug-in
terminal marked with this symbol. The connection terminals are found at the
back of the device.
The terminals allow connecting a yellow/green connection cord with a cross section
between 2.5 and 10 mm²
The unit must be connected to the equipotential bonding system whose efficiency
should be checked in accordance with the guidelines of the applicable provisions.
5.1.5 Water connection
Make sure the device is placed near a drinking water connection.
Before connecting the device, allow enough water through to remove any remnants
in the piping so that they did not get into the magnetic valves.
It is necessary to install a shut-off valve and
mechanical filter between the plumbing and the
device (Figure on the right).
On the back of the device, in the area marked
with a label, the convection oven has an input
G3/4'' with a filter
The device is provided with a water hose with 2
meters in length fitted with connectors G3/4'' and
return valve for liquids as required by applicable
regulations.
CAUTION!
The convection oven can be connected to the
water piping using the supplied water hose only!
Do not use other hoses or re-cycled hose.
The water must be supplied at a pressure
between 150 kPa (1.5 bars) to 200 kPa (2 bars)
and a maximum temperature of 30°C. If the value
of the inlet pressure is higher than 200 kPa (2
bars), you must install a pressure adapter set at
200 kPa (2 bar).
In order to ensure trouble-free operation of the device, the water should have a
hardness of maximum 5°dH to prevent lime deposits. For higher values a water
softening station should be installed first.

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5.1.6 Water outlet (206782, 206797)
The water at the outlet of the convection oven may reach high temperatures (90°C).
The hoses used to drain this water out should be resistant to such temperatures.
The water outlet is placed in lower part of the back of
the convection oven and it should be connected to a
rigid pipe or flexible hose discharging into an open
drain. The diameter of the latter cannot be smaller
than the diameter of the convection oven connection
to the sewage piping.
Install a suitable trap between the convection oven
and the sewage system to prevent the escape of any
vapours from the oven and penetration of odours
from the sewage system.
Avoid strictures in flexible hoses and bents in rigid pipes. Along the entire course of
the hose, there should be a slope of at least 5% to ensure adequate drainage. Nearly
horizontal sections should be no longer than one meter.
The convection oven should have its own connection to the sanitary sewer system.
If more than one device or systems are connected to the same pipe, make sure
that pipe dimensions allow for regular and unobstructed drainage.
Observe local regulations and standards.
5.1.7 Steam outlet vent
oDuring cooking hot vapours and other fuses are
formed; they are let out through an outlet pipe from
the cooking chamber which in the upper area of the
back of the convection oven. Do not put or place any
things above the outlet so as not to hinder the smoke
collection and not to damage these things.
oWe recommended to place the convection oven
under a kitchen hood or to provide a pipe to collect
hot steam and odours whose dimensions shall not be
smaller than those of the steam outlet vent in the
convection oven.

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5.2 User’s instruction
CAUTION!
Please read this manual carefully as it contains safety instructions and instructions
for the use of the convection oven.
Please keep this manual for future use.
Improper installation, operation, maintenance or cleaning, and any changes or
modifications may lead to malfunction, damage or injuries.
5.2.1 Safety precautions
CAUTION!
The device is designed for commercial use and may be used by qualified
personnel only.
Never place the unit near heat sources.
Do not put or place flammable materials near the unit. Risk of fire!
The temperatures food containers or other objects during and after cooking can be
very high; be particularly careful when handling them to avoid burns. You may only
grasp them wearing protective gloves. Risk of burns!
Open the convection oven door with particular caution: Risk of burns by escaping
high temperature steam.
Do not put any flammable objects and spirit-based food: they may cause
spontaneous combustion and fire which in turn can lead to explosions.
Avoid salting dishes in the oven cooking chamber. If you cannot avoid this, make
sure to clean it as soon as possible to take care of cleaning since salt may damage
the heating chamber.
The outside surfaces of convection oven may reach a temperature
exceeding 60°C. To avoid burns, do not touch the areas and items
marked with this symbol.
When the glass components of the door get damage or broken, the door needs to be
replaced immediately (please contact customer service).
When the convection oven is not in use for a short time (e.g. 12h), leave the door
slightly open.
When it is not in use for a longer time (e.g. many days), shut off the water and power
supply to the unit.

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5.2.2 First use
Make sure there are no items (accessories, packaging film, manuals, etc.) in the
cooking chamber.
Prior to the first use, make sure the installation was properly completed in terms of
the stability and levelling of the device, and power and cold water supply connection.
The air vents must left be open and shall not be covered with anything.
The device components that might have been dismantled for the time of installation
should be fitted again.
Make sure that the shelf rails supporting the trays or GN containers are properly fixed
to the inner side walls; otherwise the containers with warm or hot food may fall or slip
down and cause burns.
Heat the empty convection oven at 200°C (392°F) for about 30 minutes to remove
any smell of thermo-insulation.
Clean the device from the inside and the outside with water and neutral cleaning, and
then wipe off with clean water.
Never use corrosive or acid products for cleaning.
CAUTION!
Never clean the oven with a water jet or steam under pressure!!
For acceptance purposes, run a test cycle which will allow checking the operation of
the device and identify any potential defects/problems.
Turn the convection oven on set the heating cycle with a temperature of 150°C
for 10 minutes with medium humidity.
Carefully check the following points:
The light turns on in the cooking chamber.
The convection oven turns off (heating, steam injection, motors/fans)
when the door opens and resumes the operation when the door closes
again.
The thermostat controlling the heating temperature responds upon reaching the
set heating temperature and the heating unit turn off.
The fan motor(s) automatically reverse(s) the direction of rotation. The rotation
must be reversed every two minutes.
The heating chamber fans rotate in the same direction of rotation.
Check if the water from the hose in the moisture exhaust system in the cooking
chamber flows towards the fans.

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5.2.3 Standard maintenance
CAUTION!
Before carrying out any cleaning disconnect the device and wait until the
convection oven cools down completely.
The user may perform standard maintenance. For emergency maintenance, please
contact customer service and request assistance of a qualified licensed technician.
Regular cleaning of the heating chamber
oTo ensure trouble-free operation, hygiene and efficiency of the device, it should be
cleaned at the end of every working day.
oDo not use cleaning acids, scouring, caustic agents containing sand or soda lye.
oMake sure that water does not penetrate inside the device.
oTo protect against an electric shock never immerse the device, cords or plug in water
or other liquid.
CAUTION!
The device shall not be directly sprayed with water. Do not use water jets to clean
the device (either inside or outside)!
oWhen cleaning take the following steps:
turn the device and set the temperature dial at 80°C;
run the convection oven for 10 minutes and generate steam;
turn off the and allow it to cool down;
clean the heating chamber with warm water and a mild cleaner, and then wipe
with clean water.
WARNING! Risk of burn!
Never clean the heating chamber at a temperature exceeding 70 °C.
oDaily cleaning of the seal of the heating chamber of the convection oven shall be
carried out using a mild cleaner to ensure its unaffected status and efficient
performance.
oTo clean dirt deposits use a plastic spatula or sponge soaked in vinegar or warm water
only.
oNote: if there is grease or food residue in the cooking chamber, it should be removed
immediately since it may catch fire during the oven operation.

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Cleaning the external surfaces
oTo clean external surfaces of the device, use a cloth dampened in warm water only.
oWith the exception of special cleaning agents for stainless steel, the use improper
cleaning agents to clean external surfaces may cause corrosion of the device.
oDo not use products containing chlorine (bleach hydrochloric acid, etc.).
oAfter cleaning, use a soft, dry cloth to wipe and polish the surface.
Cleaning the oven door
oTo clean the glass door inside allow the
convection oven to cool down completely.
oThe double glass door allows easy
cleaning.
oYou can pull out the inner pane.
oLoosen the upper and lower steel plate
that hold the internal glass, turning them
clockwise.
oPull the inner pane out (Figure on the left).
oClean the inner glass on both sides using a proper cleaner.
oDo not use any scouring agents or cleaners that might scratch the elements.
oClose the inner glass mounting the steel plates in original position.
CAUTION!
When closing the door make sure that the inner pane is re-attached with steel
plates, otherwise the oven door will not close tightly.