Ovention M1313 Installation Manual
Models: M1718
Matchbox
Diagnostic Fault Tree
™
Oven
P/N 07.04.633.00
M1313
© 2013 Ovention, Inc.
Oven Doesn’t
Perform As
Intended
Oven Doesn’t
Warm Up
GO TO PAGE 3
Screens Are Blank
GO TO PAGE 4
Screens Are
Unresponsive
GO TO PAGE 5
Slider Doesn’t
Complete Travel Or
Doesn’t Move At All
GO TO PAGE 6
Oven Doesn’t
Cook Right
GO TO PAGE 7
Red Screen
Displayed When
Starting A Cook
GO TO PAGE 8
Check Fans
Is Lit (Red Light)
GO TO PAGE 9
Abnormal Noises
From Oven
GO TO PAGE 10
An Unexpected
Screen Displays
GO TO PAGE 11
Snowy Screen
Displays
GO TO PAGE 11
No Sound From
Oven Speaker
GO TO PAGE 12
Slider Banks Into
End Of Travel
GO TO PAGE 13
“Oven Too Cold”
Or “Oven Too Hot”
Message Displays
GO TO PAGE 14
Oven Clock
Doesn’t Keep
Correct Time
GO TO PAGE 11
Introduction
A Diagnostic Fault Tree is an excellent tool for troubleshooting
and solving problems that interrupt normal operation of a unit.
The fault tree is designed to grow from the “top level event” of
the unit not performing as intended. It is created by performing
an extensive “fault tree analysis” that considers all possible
causes of a unit failure.
Use the Diagnostic Fault Tree by starting at the Top Level Event
on this page. Review the definitions below to understand the
terminology and symbols used in the fault tree.
Definitions
Top Level Event = The highest level event in the hierarchical
fault tree.
Intermediate Event = An event in the hierarchical fault tree that
logically leads to the top level event, but is at a lower level than
the top event.
Basic Initiating Event = An event in the hierarchical fault tree
that is at the end of a branch in the tree. It is the lowest level in
a particular branch that is considered during the fault tree
analysis. The fault tree may have many branches, each with
one or more basic events.
Undeveloped Event = An event that is not further developed
either because it is of insufficient consequence or because
information is unavailable.
Symbols
The following symbols are used in this fault tree analysis. Each
symbol is shown along with its description.
Intermediate Event
The Intermediate Event symbol is used to
specify a failure event that occurs due to one or
more causes acting through logic gates below it
in the fault tree.
Basic Initiating Event
The Basic Initiating Event symbol is used to specify
a failure event that does not require any further
development. In other words, it is a “leaf” on the
fault tree and has no events or gates below it in the
tree.
“Or” Logic Gate
The Or logic gate symbol is used to show that the
output fault (everything below) will occur only if one or
more of the input faults (everything above) take place.
Transfer
This symbol is used to modularize a fault tree. For
example, if there is a sequence of events that
occurs in more than one place in the fault tree, then
it can be removed and placed into a separate subtree and just referenced by the main fault tree.
TOP LEVEL EVENT:
Oven Doesn’t Perform As Intended
2
OVM_FT-0113
Oven Doesn’t
Warm Up
Press reset button
on rear of oven
and wait 5 minutes
Repair
complete
Oven still doesn’t
warm up
Check fuses
Blown fuse found
Inspect wiring for
fraying or charring
No blown fuse
found
Check heater
current
No fraying or
charring observed
Fraying or charring
observed
Heater current OK
Heater current not
OK
Check heater
continuity
Assure
latest
firmware
is installed
Replace
damaged
components
Using a DVM
inspect heater
continuity
Heater continuityOKHeater continuity
not OK
Replace
Relay Board
Replace
Heater
Replace
Heater
Check
thermocouples
Thermocouple
readings OK
Thermocouple
readings not OK
Replace
Relay Board
Replace
Relay Board
Replace
Relay Board
Check
thermocouple
connections
Thermocouple
connections OK
Thermocouple
connections not
OK
Reseat
thermocouple
connections
Verify UI board to
relay board
communications
Replace
RJ45 cable
Connections
between UI board
and Relay board
OK
Check connections
between UI board
and Relay board
Connections
between UI board
and Relay board
not OK
UI board to relay
board
communications
OK
UI board to relay
board
communications
not OK
Heater continuity
OK
Heater continuity
not OK
Oven Doesn’t Warm Up
OVM_FT-0113
3
Screens Are Blank
Verify that oven is
plugged in
Oven is not
plugged in
Oven is plugged
into working 208/
240 VAC mains
power
Plug oven into
208/240 VAC
mains power
Verify that door
standby switch
and disconnect
switch are on
Door switch or
disconnect switch
is off
Turn on the
switch that is
off
Both the door
switch and
disconnect switch
are on
Check that PTC 2
is good (light is off)
Replace
24 VDC
supply
Check the RJ45
cable outside of
door for 24 VDC
Check 24 VDC on
UI board
(inside of door)
24 VDC found OK
24 VDC not found
on UI board
24 VDC found
on UI board
No 24 VDC found
Check input
voltage, wiring,
10 A fuses
Correct input
voltage, wiring, or
10 A fuses as
appropriate
PTC 2 is good
(light is off)
PTC 2 is not good
(light is on)
Check that 24 VDC
supply is good
Check RJ45 cable
for shorts or signs
of pinching or
nicking
24 VDC supply is
good
24 VDC supply
voltage is wrong
24 VDC supply has
no output
RJ45 cable is OK
RJ45 cable is not
OK
Replace UI
board
Replace
RJ45 cable
Replace
cable
Replace
interior cable
and bulkhead
connector
Replace
UI board
Screens Are Blank
4
OVM_FT-0113
Screens Are
U
nresponsive
Are both screens
unresponsive?
Only one screen is
unresponsive
B
oth touchscreens
are unresponsive
Is the screen
cracked?
Turn off standby
switch (on door)
for 3 seconds
then turn it on
Both screens are
still unresponsive
Turn off red
disconnect switch
for 10 seconds,
then turn it on
Unresponsive
screen problem
resolved
Unresponsive
screens
problem
resolved
Replace
screen
Screen is cracked
Screen is not
cracked
R
emove oven door
Check that
touchscreen cable
is properly seated
in connector,
and not damaged
Unresponsive
screens problem
persists
Unresponsive
screens problem
persists
Replace
UI board
Touchscreen
cable is not
properly seated in
connector
Touchscreen
cable is properly
seated in
connector, and is
not damaged
Touchscreen
cable is damaged
Replace
touchscreen
cable
Reseat cable in
ZIF connector
on UI board
Replace
touchscreen
Replace
UI board
Unresponsive
screen
problem is
resolved
Screens Are Unresponsive
OVM_FT-0113
5
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