MKN Combisteamer Silver II Operating instructions

Troubleshooting manual
Troubleshooting & Error messages
Electric and Gas Combisteamer Silver II
2010/02/22 SEV/KA
Model Serial-No. / date
Csxxxxx From p to
HansDampf 6 1 07020766 / June 2007
HansDampf 6 2 Maxi 07020584 / June 2007
HansDampf 10 1 07020584 / June 2007
HansDampf 10 2 Maxi 07020584 / June 2007
HansDampf 20 1 07020584 / June 2007
HansDampf 20 2 Maxi 07020584 / June 2007
1

Troubleshooting manual
Overview of the error messages
Error message
Description
Err 1
Error core temperature probe
Err 2
Error chamber probe 1
Err 3
Error chamber probe 2
Err 4
Core temperature probe not calibrated
Err 5
Error drain probe
Err 7
Error reference probe on board defect
Err 8
Risk of ice
Err 9
Overtemperature cooking chamber
Err 10
Overtemperature electronic
Err 11
Electronic too hot
Err 20
Core temp replace not possible
Err 30*
No fan 1
Err 31*
Fan runs
Err 32*
No fan 2
Err 33*
Fan direction wrong
Err 36*
Jumper setting at frequency controller wrong
Err 40
Not authorized access
Err 66**
No water
Err 71*
No gas 1
Err 710*
No gas 2
Err 72*
No gas fan 1
Err 720*
No gas fan 1
Err 73*
General gas fault 1
Err 730*
General gas fault 2
Err 74*
No flame 1
Err 740*
No flame 2
Err 101***
Battery empty
Err 120
12 Volt ground error
Err 121
UREF0 Ground error at probe or pcb
SHO
Demo mode
-n-
Emergency program
-c-
Carry out unit configuration in the service area
*= Only at Gas units
**= Only at units with WaveClean
***= Only at units with gas and communication pcb
2

Troubleshooting manual
Contents
Overview of the error messages 2
Overview of the emergency programs 4
The diagnosis memory (error memory) 5
Err 2 Temperature probe chamber 1 defect 7
Err 3 Temperature probe chamber 2 defect 7
Err 1 Core temperature probe defect 8
Err 5 Error drain temperature probe 9
Err 9 Over temperature cooking chamber 10
Err 10 Electronic to hot 11
Err 11 Electronic overheated 11
Err 7 Reference temperature probe defect 11
Err 8 Ice damage risk 11
Err120 12 Volt ground error 12
Err121 HW-Fail Temp UREF0 to high 12
Err 66 No water (Only at units with WaveClean) 13
Err 30 No fan 1 (only at gas units) 14
Err 32 No fan 2 (only at gas units) 14
Err 33 Error Fan direction (only at gas units) 16
Err 31 Fan runs(only at gas units) 16
Err 71 No gas 1 Err 710 No gas 2 17
Err 74 Error flame 1 Err 740 Error flame 2 17
Err 72 Gas fan 1 Err 720 Gas fan 2 22
Err 73 generic gas fault 1 Err 730 generic gas fault 2 23
Err 75 Error Gas reset 1 Err 750 Error Gas reset 2 24
3

Troubleshooting manual
Overview of the emergency programs
In case of an error the electronic switches in an emergency mode automatically This ensures enabled
restricted operating with the Combisteamer
After the unit has switched on, the corresponding error message appears on the display
This has to be confirmed by pressing the Step- button -n- (emergency program) appears in the
upper display
Overview
Error message Description Consequence
Err 4 Core temperature
probe broken
The core temperature probe function is not available
Err 2
Err 3
Chamber probe 1
broken
Chamber probe 2
broken (only at
20.x)
6 x & 10 x: The core temp probe is used as a chamber probe
now The core temperature probe function is not available
20 x: The second chamber probe is used for both chamber
areas now
Due the position of the core temp probe, temperature
differences of the chamber temperature measurement are
possible
Err 5 Drain temperature
probe broken
The drain cooling regulation changes in an emergency
program (Controlled by the pcb) An increased water
consumption arises from it
4

Troubleshooting manual
The diagnosis memory (error memory)
The diagnosis memory offers a very easy possibility to demand current and former error messages
These are listed historically
The diagnosis memory can accessed as follows:
1 Switch unit on
2 Push FLEXI button Select d1A
(diagnosis) with the upper knob
3 Press the Start/ Stop button
The last error appears on the
lower display (e g 66 (Error
„no water“)
4 The fault counting appears on the
upper display Turn the upper
knob to change to the next error
message
( No 001 = last error; No 002 =
second to the last error; )
5 Leave area by pressing the FLEXI
button
5
d1A
66
001

Troubleshooting manual
6
Error messages and troubleshooting

Troubleshooting manual
Err 2 Temperature probe chamber 1 defect
Err 3 Temperature probe chamber 2 defect
The error Err 3 (temperature probe chamber 2 defect) concerns only unit size 20 x , because these
unit has two chamber probes Chamber probe 1 = upper chamber, chamber probe 2 = lower chamber
Consequence:
The electronic changes in an emergency program automatically
Position of the chamber probe(s):
On the right chamber side
Designation of the component(s) in the wiring diagram:
B2 (Chamber 1) or rather B3 (Chamber 2, only 20.x)
Troubleshooting:
7
Check contacting at plug X11 on
the control pcb A2 (Mistakes
cleared?
No
Check occupancy of the probe at
plug X11 (see also wiring
diagram)
B2 = clamp G1+ and G1-
B3 = clamp G2+ and G2-
Mistakes cleared?
No
Change chamber probe
Mistakes cleared?
Change control pcb
No

Troubleshooting manual
Err 1 Core temperature probe defect
Consequence:
The electronic changes in an emergency program automatically The function of the probe is
deactivated
Position of the core temp. probe:
In the front of the chamber
Designation of the component in the wiring diagram:
B1
Troubleshooting:
8
Check contacting at plug X16 on
the control pcb A2
Mistakes cleared?
No
Check occupancy of the probe at
plug X16 (see also wiring
diagram) Mistakes cleared?
No
Check if the core temp probe is
mechanical damaged Change
probe if necessary
Change control pcb
No

Troubleshooting manual
Err 5 Error drain temperature probe
Consequence:
The electronic changes automatically in an emergency program The drain cooling switches on and off
controlled by the electronic (During operation)
Position of the drain temperature probe:
The probe is located at the trap
Designation of the component in the wiring diagram:
B4
Troubleshooting:
Functional test:
Enter the service menu and select drA (drain test)
9
Check contacting at plug X11 on
the control pcb A2 Mistakes
cleared?
Check occupancy of the probe at
plug X11 (see also wiring
diagram)
B4 = clamp W+ and W-
Mistakes cleared?
Change control pcb
No
Change drain probe Mistake
cleared?
No
No

Troubleshooting manual
Err 9 Over temperature cooking chamber
Consequence:
The unit is not ready for operating until the unit has cooled down
Error description:
A temperature of >310°C (590°F) electric units or > 270°C (518°F) gas units were measured in the
chamber by the Core temp probe, camber probe or the humidity probe
Troubleshooting:
10
Open the left side wall Maybe th solid state relay
switches power permanently (short-circuit)
Switch the unit on (standby) and check current
consumption / voltage at the load side of the
SSR Is there a current flow / would voltage put
through and the green LED on the SSR´s are off?
Replace broken solid state relay Check if the fan
wheel is out of balance
Yes
Switch the unit on (standby) and check current
consumption / voltage at the load side of the
SSR Is there a current flow / would voltage put
through and one of the green LED on the SSR´s
is on?
There is an error on the control pcb LED P1 or P2
is permanently on
(control of the SSR´s) Replace control pcb
Yes
Check contacts of the probes at the plug X11 at
control pcb A2 Reset the electronic Mistakes
cleared?
Change chamber probe Maybe one probe has
broken
Is -n- (emergency program) shown on the
display? After switching on the unit?
Enter the diagnosis memory The core temp probe
has placed into the product during the unit was into
the emergency program See also error „CT-
probe defect“
Yes
No
No
No
No

Troubleshooting manual
Err 10 Electronic to hot
Err 11 Electronic overheated
Consequence / description:
Error: “Electronic to hot:
The measured temperature of electronics amounts to at least 70°C (158°F) The cooked program is
stopped
Error “Electronic overheated”:
The measured temperature of electronics amounts to at least 80°C (176°F) The oven switches off
itself After cooling down the device is operational again
Position of the temperature probe:
The probe is located on the control pcb This cannot be exchanged one by one
Troubleshooting:
Err 7 Reference temperature probe defect
Consequence:
The unit is out of order The reference temp probe on the control pcb has broken
Troubleshooting:
Change control pcb
Err 8 Ice damage risk
Consequence:
The unit is out of order A temperature of < 0°C (32°F) has measured on the control pcb
Position of the temperature probe:
The probe is located on the control pcb (on board probe)
Troubleshooting:
Ensure that the temperature next to the unit is not less than < 0°C (32°F) Perhaps change oven
location
Caution! There is a high risk that water pressurized components were damaged
11
No
Clean fresh air area
Does the cooling fan work?
This fan is energized as soon as
the device is switched on No
Exchange cooling fan
Is the fresh air area free of dirt
(left hand side at the bottom of
the oven )?
Yes
A device which produces high
temperatures is next to the left
side Change structural situation
No

Troubleshooting manual
Err120 12 Volt ground error
Error description:
The error means, that the there´s a ground shortcut at the control pcb The error appears after switching
the unit on and is not ready to operate
Troubleshooting:
Disconnect the following components one by one to identify the faulty component:
–Core temperature probe B1
–Pressure switch B10 at the steaming unit (only at units with WaveClean)
If the error still apears after disconnecting the mentioned parts, the control pcb #202676 is faulty
Err121 HW-Fail Temp REF0 to high
Error description:
The error signalled, that the supply line is disturbed on the circuit board and/or from sensors A sensor
has a very low resistor or direct chassis ground contact with the frame
The first possibility is likely if the fault occurs during WaveClean or in steaming mode Explanation:
The water gets into the probe and builds up an electric connection between the probe itself and the
chassis Through this connection a voltage potential from the chassis reaches the temperature inputs of
the keyboard pcb and causes the malfunction
Troubleshooting:
Disconnect the following components one by one to identify the faulty component:
–Pressure switch B10 at the steaming unit
–Core temperature probe B1
–Drain probe B4
–Chamber probe B2
–Chamber probe B3 (only at floor unit 20 x)
If the fault appears only at the automatic cleaning WaveClean, the drain probe B4 is probably the
cause
12

Troubleshooting manual
Err 66 No water (Only at units with WaveClean)
Description:
The error message appears only during steaming and WaveClean mode The error only appears if the
the pressure switch realised a water pressure less than 1bar (14 5 psi) The contact opens and the
message appears on display
Consequence:
„Steaming“ mode: After confirmation of the error message the program can be continued
„WaveClean“ mode: Cleaning process is stopped and „WaveClean interrupted“ is displayed An
cancellation program starts automatically
Troubleshooting:
13
Ja
Is the on site water
supply available?
Carry out CLE (water
calibration) in the service area
Is steam built up in the chamber
/water injected over the supply
pipe in the chamber? (At 20 x
over both pipes)?
Yes
Yes
Is the water inlet
filter at the water
connection and at
the steaming unit
present and free of
dirt?
No
No
Ensure water supply The water
flow pressure must be
at least 1,5bar (21 8 psi)
Clean or replace filter
No
Yes
No
Are both solenoid
valves of the water
steaming
unit energized?
Carry out CLE (water
calibration) in the service area
Are 140 ml (+10 ml) coming out
of the water supply pipe
( examine with measuring
container)?
Check / change pressure switch
No
Yes
Check the coils (continuity test)
Exchange coil or water steaming
unit

Troubleshooting manual
Err 30 No fan 1 (only at gas units)
Err 32 No fan 2 (only at gas units)
Designation of the component(s) in the wiring diagram:
Fan M1, frequency controller V10 (upper chamber at the 20 x)
Fan M2, frequency controller V20 (lower chamber at the 20 x)
Description:
The electronic waits for a confirmation signal from the hall sensor (fan speed control) after the fan has
started If this does not take place within 2 minutes, the error message appears A released safety limit
switch would also generate this error message!
Troubleshooting:
LED status Description Steps to do
On Frequency controller works -
Off Frequency controller is not working Check input voltage, replace frequency
controller
3 flashes per
period
Over temperature of frequency
controller
Check all cooling fans, replace frequency
controller
6 flashes per
period
Short circuit at the fan Check fan and replace, if necessary
7 flashes per
period
Frequency controller doen´t start Wrong configuration of jumper J1 on the
frequency controller
14
Ja s the LED on the
frequency controller
flashing?
Open front panel and switch unit on
Is the green LED on the frequency
controller flashing or permanently
on ? Ja
Carry out troubleshooting
with help of chart
No
Yes
Continuation on the
next page
The LED is permanently on Enter the
service menu Select rEL and check/
start relay r2 Does the fan start in left
direction?
Check function of the relay
Measurement points: Connection X9 3 on the
control pcb or input D0 at the frequency
controller (230V against N)
If the relays is broken, the reserve relay r23
function can be used
No
Enter the service menu Select rEL and
check/ start relay r20 Does the fan
start in right direction?
Check function of the relay
Measurement points: Connection X9 4 on the
control pcb or input D0 at the frequency
controller (230V against N)
If the relays is broken, the reserve relay r23
function can be used
No
Yes
Yes
The hall sensor in the fan has
broken Replace fan motor

Troubleshooting manual
Further information:
15
Relay K2 energizes D0
Relay K20 energizes D1
Input
Fan mode D0 D1
Right 0 1
Left 1 0
1 = 230V measured against N
0 = no voltage
The green LED on the frequency controller is
off Is the power supply at the frequency
converter provided (230V on terminal L/N)?
No
Are the fuse(s) F1 / F2(only at 20.x) OK?
Yes
Does the main contactor K1 energized
(check voltage)? The main contactor must
switch as soon as the device was switched on
No
Replace frequency controller
Replace fuse Maybe the fuse was destroyed
by a faulty frequency controller
Change if necessary
The load side of the main contactor is faulty
Change contactor
Yes
No
Yes
Yes
Reset safety switch Is
-n- (emergency
program) shown on the
display?
Enter diagnosis memory The
core temp probe has placed
into the product during the
unit was into the emergency
program See also error See
also error Err1
Yes
Check the connected gas type
The device is possibly set for
natural gas and operates with
liquid gas Through this the
heating performance
increases
No
No
Only at units with draft diverter F10: Check
function (pass) of the exhaust high limiter
Enter the service menu Select rEL and
check/ start relay r1 Are 230V at plug X9 2
provided? No
Check fuse F4 on the control
pcb and replace if necessary
If the relays is broken, the
reserve relay r23 function
can be used
Open the left side wall Has the safety switch
released (two safety switches at the 20 x)?

Troubleshooting manual
Err 33 Error Fan direction (only at gas units)
Error description:
The fan runs in the wrong direction
Troubleshooting:
Further information:
Err 31 Fan runs(only at gas units)
Error description:
The fan runs after the end from a program or during the unit is on (standby)
After 20 seconds the error message appears on the display
Troubleshooting:
16
Ja
Enter the service menu, select fan and check both fan modes
Attention! The front panel and the door must be closed Otherwise the door contact switch is open
If the error message comes up, there can be the following causes:
–D0 and D1 at the frequency converter are wrong connected (crossed)
–The frequency converter is faulty
Relay K2 energizes D0
Relay K20 energizes D1
Input
Fan mode D0 D1
Right 0 1
Left 1 0
1 = 230V measured against N
0 = no voltage
Ja
Enter the service menu and select rEL and check relay r2
(Voltage measurement at the respective output) If one of the
relays is broken, the „reserve relay“ function can be used
Exchange control pcb, if necessary
Enter the service menu and select rEL and check relay r20
(Voltage measurement at the respective output) If one of the
relays is broken, the „reserve relay“ function can be used
Exchange control pcb, if necessary
Replace frequency controller

Troubleshooting manual
Err 71 No gas 1 Err 710 No gas 2
Err 74 Error flame 1 Err 740 Error flame 2
Error message “Error flame” available from Software V4.01 (S/N 10020294, 02/2010)
Error description “No Gas”:
Error “No Gas 1” (Upper burner at 20 x floor units) and error “No Gas 2” (Only at 20 x floor units;
lower burner) means, that no flame has been detected after start-up by the ionisation electrode /
ignition box
Error description “Error flame” detection:
After starting the unit, the ignition box detected the flame by the ionisation electrode Afterwards the
flame signal got lost (Error flame 1 = Upper burner at 20 x floor units; Error flame 2 = Only at 20 x
floor units; lower burner)
The difference between both errors is, that error “No Gas” is a start-up gas performance fault and
“Error flame” is a an error within the burning sequence
Units up to S/N 10020294 can only display the error “No Gas” without number “1” and “2” This
means, that at 20 x floor unit the technician has to find out which area doesn't work (upper or
lower burner system)
The causes subdivides into four possible categories:
–No or too less gas pressure at the gas valve → Check gas supply and gas valve
–The unit gets out of order sporadically → Check gas valve, carry out CO² calibration according
to the installation manual (if necessary check gas orifice), ignition box ((glow electrode) and
ionisation electrode
–There´s no ignition process of the glow electrode (because the electrode doesn't glow)
→ Check glow electrode and ignition box
–There´s no flame detection, but burning process works(glow electrode glows up) → Check
ionisation electrode
17

Troubleshooting manual
Troubleshooting
Note:
The ignition box should be replaced for (service) tests before replacing any electrodes or the gas valve!
If the error still appears, the ignition box can swapped again
Gas supply check:
Check gas pressure (flow pressure)
Preparations:
Disconnect power supply, close gas tap, remove left
side panel
➢Unscrew (open) the right sealing screw (IN) at
the gas valve That area is connected with the
gas supply directly
➢Connect gas pressure meter
➢Open gas tap again
➢Switch unit on and select any operation
program Start-up unit
➢Check and compare gas pressure according to
the following values:
Gas type Gas flow-pressure
Natural Gas E/H –
G20
15 – 25 mbar (6 - 10 In W C )
Natural Gas LL/l – G25 15 – 30 mbar (6 – 12 In W C )
LPG B/P – G30 / G31 15 – 57,5 mbar (6 – 23 In W C)
Note:
➢Carry out gas pressure check while all units at
the gas line are switched on max power
(properly the dimensions of the gas pipe are too
small)
➢The connected gas pipe must be at least ¾“
diameter
18

Troubleshooting manual
Gas valve check:
Preparations:
Disconnect power supply, close gas tap, remove left
side panel
➢Unscrew (open) the left sealing screw (O T) at
the gas valve That area is connected with the
gas blower area
➢Connect gas pressure meter The reading of the
manometer should be at least 0 1 mbar
(0,04 In W C )
➢Open gas tap again
➢Switch unit on and select any operation
program Start-up unit
➢If the gas blower is on start speed and the gas
valve is still closed, a negative pressure of
approx 3 mbar (1,2 In W C ) must adapt This
means that the gas blower promotes air and a
negative pressure adapts at the Venturi
➢This negative pressure breaks in, if the gas valve
is opened in the further course and a little
negative pressure of < 0 5 mbar (< 0 2 In W C )
lasts (nearly pressure less)
➢If the negative pressure at gas valve orifice lasts,
the ignition box or the gas valve are faulty
Note:
In some countries the an on-site gas valve breaks
down the gas supply when the hood over the unit is
not powered on In that case check valve on site as
well as the general function
Also ensure, that not to many gas units are connected
at one line
Gas heat exchanger leakage check:
If the gas heat exchanger is not tighten to the cabinet (such as a cracked heat exchanger), the error „no
gas“ or “error flame detection” appears too
Check procedure:
Place the CO² probe in the cabinet (in the left area, if possible) and switch the unit on repeatedly in any
operation mode If the gas meter detects Gas in the cabinet, the gas heat exchanger is not tighten any
more
19
O T

Troubleshooting manual
Glow electrode check:
With relay K14 „Gas On 1“ and relay K15 „Gas On 2“(only at 20 grid units) in the relay test at relay
test in the service area the glow electrode can be energized manually and the corresponding glowing
electrode must come on yellow color through the observing window Please note that relay shuts off
after a while to protect the electrode Also follow the troubleshooting:
Ionisation electrode check (flame detection)
The ignition box (N10 / N20) detected no flame within the safety ignition time even though the flame
is there The ionisation electrode can be checked by measuring the current (A)while the burning
process (flame available) The current must be at least 3µA
20
24-28 V
24-28 V
N
F1 3,15 A
(secondary)
Glow-
electrode
Ionisation-
electrode
Activate relay K14 or K15 (only 20 x) Check
voltage between point 1 and 2 Are 24–28 V
available and the electrode doesn't glow ?
Caution! The ignition box can block the
energizing voltage for the electrode after that test!
Use Relay K22 or K21 (at 20 x units) to enable
box by a gas reset signal
Replace glow
electrode
Yes
Check output voltage from transformer T2 /
T3(only at 20 x) Are 24-28V present?
No
Check fuse F1
and supply
voltage of the
transformer
Replace
transformer, if
necessary
Check gas reset signal for the ignition box
Activate relay K22 / K21(only at 20 x) in the relay
test A relay must switch in the igniting box
Check voltage (230V when relay is energized) at
igniting box clamp X1 11 against N if necessary
Is the relay working?
Replace
ignition box
No
Yes
230 V are on X1 11 available if the rest relay is
activated and the voltage is put through the glow
electrode Check current (A) of the glow electrode
which must be at least 1,4A If the current is too
low, the electrode reaches not the requires power
If the current is more than 1,4A the ignition box or
the glow electrode may the reason of failure Start
troubleshooting with replacing the ignition box
first
Ignition box
Terminal X1
(behind
the cover)
1
2
Transformer T2 (and T3 at 20 x)
No
Yes
N
3 µA