Rational iCombi Pro Operating instructions

iCombi Pro
iCombi Classic
Troubleshooting

2 / 64 80.51.321_ET_en-GB_V03

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1 Troubleshooting
Safety instructions
nAdhere to the relevant local regulations and standards in your country.
nSecure the unit against tipping during transport, after setting up at the installation location.
nWear appropriate protective clothing, such as protective gloves and safety shoes, when trans-
porting and installing the unit.
nThe appliance must be installed in a frost-resistant, non-windy and protected environment.
nDo not expose the unit to weather conditions such as rain.
nOnly connect the unit in accordance with the installation manual and the information on the
nameplate.
nSwitch the unit off before disconnecting the mains power or connecting to the mains.
nAfter use, only transport the unit at ambient temperatures above 0°C [32°F].
nOnly store the unit at ambient temperatures above 0°C [32°F].
nDo not operate the unit without an air filter.
nDo not spray aerosols in the vicinity of this appliance while it is in operation.
nService work may only be carried out by technicians that are trained by RATIONAL.
nWhen performing maintenance work, adhere to the relevant country-specific and local regulations and standards.
nAfter performing maintenance work, check the unit for electrical (and, if necessary, gas-related) safety in accordance
with the applicable regulations.
nDisconnect the unit from the power supply before working on electrical systems.
nAfter repair/maintenance of electrical components, check the unit in accordance with the applicable standards and reg-
ulations to guarantee electrical safety.
nAfter working on gas-carrying components and/or changing the type of gas connected, carry out a detailed flue gas
analysis with the appropriate measuring devices.
Work on gas-carrying components may only be carried out by trained technicians.
After working on gas-carrying components, check all gas pipes for leaks.
nWhen working with chemicals, wear the appropriate protective equipment and clothing, e.g. protective gloves and
safety goggles.
nForwarding product-specific information to third parties is prohibited.

4 / 64 80.51.321_ET_en-GB_V03
Table of contents
1 Troubleshooting ................................................................................................................................................................................... 3
2 ET_iCombi_10_V03.pdf .................................................................................................................................................................... 6
3 ET_iCombi_12_V03.pdf .................................................................................................................................................................... 7
4 ET_iCombi_20_V03.pdf .................................................................................................................................................................... 8
5 ET_iCombi_25_V03.pdf .................................................................................................................................................................... 9
6 ET_iCombi_28_V03.pdf ..................................................................................................................................................................10
7 ET_iCombi_29_V03.pdf ..................................................................................................................................................................11
8 ET_iCombi_32.1_V01.pdf...............................................................................................................................................................12
9 ET_iCombi_32.2_V01.pdf...............................................................................................................................................................13
10 ET_iCombi_32.3_V01.pdf...............................................................................................................................................................15
11 ET_iCombi_32.4_V01.pdf...............................................................................................................................................................16
12 ET_iCombi_33.1_V01.pdf...............................................................................................................................................................17
13 ET_iCombi_33.2_V01.pdf...............................................................................................................................................................18
14 ET_iCombi_33.3_V01.pdf...............................................................................................................................................................19
15 ET_iCombi_33.4_V01.pdf...............................................................................................................................................................20
16 ET_iCombi_33.5_V01.pdf...............................................................................................................................................................21
17 ET_iCombi_34.1_V03.pdf...............................................................................................................................................................22
18 ET_iCombi_35.1-7_V03.pdf...........................................................................................................................................................23
19 ET_iCombi_37_V03.pdf .................................................................................................................................................................. 24
20 ET_iCombiPro_40_V03.pdf............................................................................................................................................................25
21 ET_iCombi_41_V03.pdf .................................................................................................................................................................. 26
22 ET_iCombi_42.1_V01.pdf...............................................................................................................................................................27
23 ET_iCombi_42.2_V01.pdf...............................................................................................................................................................29
24 ET_iCombi_42.3_V01.pdf...............................................................................................................................................................31
25 ET_iCombi_42.4_V01.pdf...............................................................................................................................................................33
26 ET_iCombi_42.5_V01.pdf...............................................................................................................................................................35
27 ET_iCombi_42.6_V01.pdf...............................................................................................................................................................37
28 ET_iCombi_44_V03.pdf .................................................................................................................................................................. 39
29 ET_icombi_72_V03.pdf ................................................................................................................................................................... 40
30 ET_iCombiClassic_90_V03.pdf...................................................................................................................................................... 45
31 ET_iCombi_110_V03.pdf................................................................................................................................................................46
32 ET_iCombi_120_V03.pdf................................................................................................................................................................47
33 ET_iCombi_Changing_gas_type_V03.pdf..................................................................................................................................48
34 ET_iCombi_Checking_performance_of_P1.pdf........................................................................................................................50

80.51.321_ET_en-GB_V03 5 / 64
35 ET_iCombi_Data_Loss_V01.pdf ...................................................................................................................................................51
36 ET_iCombi_Fuel_gas_analysis.pdf ............................................................................................................................................... 52
37 ET_iCombi_Humidity_problem_uneven_cooking_result_V03.pdf .................................................................................... 53
38 ET_iCombi_Manual_humidity_calibration_V03.pdf ................................................................................................................ 54
39 ET_iCombi_Unit_does_not_heat_up_V03.pdf.........................................................................................................................55
40 ET_iCombiClassic_Changing_CPU_pcb_A12_V03.pdf .......................................................................................................... 57
41 ET_iCombiClassic_Starting_second_self_test_V03.pdf......................................................................................................... 58
42 ET_iCombiPro_Changing_CPU_pcb_A11_V03.pdf ................................................................................................................ 59
43 ET_iCombiPro_Starting_second_self_test_V03.pdf...............................................................................................................60

1
Service error: 10
Error tree: Water level in the steam generator not dropping
Service error: 10
Unit type: iCombi
V03· 04/2021· RTS/Shof · en-GB
Thewater level inthe steamgenerator does not drop duringautomatic pumping.
Activate the functionaltest intheservice level
Start theSC-pump M4
Checkshort circuit of level electrode,
or drainsystem/discharge box for
dirt, cleansystemifnecessary
Checkthepump, pump hose and Combi water box for
limescaledepositsor other dirt. Check the inlet of the - pump
on the steam generator side. Dirty?
Pump active, water is pumped off
automatically.
Yes No
Clean, checkand, if necessary, replace thepump
housing, descale the steamgenerator, clean the
Combi water box, clean the pump hose,
connectinghoseand ventilation pipe
Yes
Is control fuse A10-F1 and A10-F2 on I /
O PCB(A10) OK?
No
Replacefuse F1 and/or F2
on A10
TheM4 is connected to the PCB A13.
Checkif thePCB is powered, wherethe M15is
controlled, e.g. the pump. Supplied with power?
Yes
No
Measure150-V output on the pump board X2 during
thefunctiontest.Is a voltage of 150 V present?
Checkthecable, plug and pump.
Replaceanyfaulty parts Arethe 3 green LEDs ontheI/O board
(A10) lit up? ReplaceI/O board 42.00.311
Check cableand pump for short circuit, replace fuse if
necessary
Reset errors bystarting a cleaning programme.
Yes
No
Yes
No

1
Service error: 12 V03· 05/2021· RTS/Shof · en-GB
Error tree: CDS sensor not emitting a signal
Service error: 12
Unit type: iCombi
Check the connector on the solenoid valve block and
I/O board, checkthe CDS sensor signal inthe
diagnostic program(pulsecounter)
Open thetap, cleanthedirt filter inthe
water inlet
Is thewater pressure onthe hand
shower OK?
Yes No
Is thepulse quantity
1360 pulses for iCP
1360 pulses for iCC,
1000 pulses for XS?
Replacethesolenoid valve block
Art. 50.02.012 (5x solenoid valve block for iCombi Pro 20 1/1, 20 2/1
Art. 50.02.054 (5x solenoid valve block for iCombi Pro 6 1/1 - 10 2/1
Art. 50.02.102 (3x solenoid valve block + Care for iCombi Classic 6 1/1 - 10 2/1
Art. 50.02.103 (2x solenoid valve block for iCombi Classic 6 1/1 - 10 2/1
Art. 50.02.104 (3x solenoid valve block +CareforiCombi Classic20 1/1 -20 2/1
Art. 50.02.105 (2x solenoid valve block for iCombi Classic 20 1/1 - 20 2/1
If an error 42.1 - 4 was also triggered, reset the error via Cleanjet module test.
No

1
Service error: 20 V03· 05/2021· RTS/Shof · en-GB
Error tree: Thermocouple is faulty
Service error: 20
Unit type: iCombi
Service error20.1
Thermocouple cabinet B1 is faulty.
Note: There is also a second B9 cooking chamber
sensor for floor units, to which the Fault Tree also
applies.
Replacethesensor, reset maximumvalue
B1 in diagnosis
Cooking not possible
Service error20.2
Thermocouple control valve B2 is faulty.
ICP 62/3 uses this sensor, referred to as B10, for
themotor temperature ontheshaft.
Replacethesensor, reset maximumvalue
B2 in diagnosis
Cooking possible
Unit in emergency operation
Service error20.4
Thermocouple humidity B4 is faulty. Replacethe sensor, reset maximumvalue B4 in diagnosis
Cooking possible
Unit in emergency operation
Service error20.8
Thermocouple steam generator B5 is faulty. Replacethesensor, reset maximumvalue B5 in diagnosis
Only hot air possible
Unit in emergency operation

1
Service error: 25 V03· 05/2021· RTS/Shof · en-GB
Error tree: The water quantity during cleaning is insufficient
Service error: 25
Unit type: iCombi
Circulation pump does not performor does not
perform sufficiently(water loss during cleaning) or
no power increaseon the fan motor. Checkwater filter, pressure and hosesWater connectionOK? No
Is thedrainsieve in the cabinetclean? Clean thedrain sieveNo
Is thecookingchamber door ok? Check door seal and trolley seal (floor units). Check
door setting.
No
Run the wastewater pump in thefunctional test for
10 seconds
Activate the circulation pump in the
functional test. Is the pump running?
Yes
Yes
Is thereenoughwater coming out of the
nozzle?
Is thevoltage output availableon pump
board X4?
Yes
Fault reset withquickcleaning
Checkthecablesand connectors onthe pump board
and pump.
Replace faultyparts
NoNo
Yes
Arethe circulationpump and associated
water pipes tight?
Check thefunctionof thefan motors
Yes
No Replace faultypartsNo
Is the cleaning pipe free?
Disconnect thehose fromthe circulation pumpand spray into
thecleaning pipe fromthe cooking chamber using the hand
shower
->if no water comes out of theback, cleanthe pipe
Yes
No
Removethecleaning boxand checkifthe suction and pressure
ports of the circulation pump areclear. Is theflangeto the control
boxfree? Is the odour trap at the entrance of the cleaning boxfree? Clean cleaning box
Reset errors bystarting express cleaning
Yes
No
Yes
Yes

1
Service error: 28 V03· 05/2021· RTS/Shof · en-GB
Error tree: Thermocouples B5 or B1 are too hot
Service error: 28
Unit type: iCombi
Serviceerror 28.1
Thermocouple B5 isover 170 °C
Theheating element steamiscalcified or thesteamgenerator is too hot
Check maximum valueB5 in diagnosis
Maximum value B5 over 120 °C
Checkcalcificationinthesteamgenerator, descale the steam generator
Reset maximum valueB5 in diagnosis
Serviceerror 28.2
Thermocouple B1 isover 350 °C
Heating element in thecooking cabinet calcified or too hot.
Check maximum value B1 in diagnosis
Maximum valueB1 over 350 °C
ChecktheSSR.
Yes
Yes
Yes

1
Service error: 29
Error tree: Cooling circuit isnot working properly, board temperature is over
80 °C
Service error: 29
Unit type: iCombi
V03· 04/2021· RTS/Awei · en-EN
Checkthemaximum temperatureof theboard inthe diagnosis
Maximum temperatureover 80°C
Checkcooling fan
Check, cleanor replaceair filter
Coolingfan runswhenCooking Modeis selected and the door is closed
No
Display service29
Coolingcircuit is not working properly, board temperature is over 80 °C
YES
YES

1
Service error:32.1
Error tree: Gascombustion system
Service error: 32.1
Unit type: iCombi
V01· 05/2021· RTS/Shof · en-GB
Error inthe gas combustion system
"Lockout error" → gas reset requiredafter the error is resolved
Serviceerror 32.1
Ignition process faultygas error22, 32, 42
5x unsuccessful ignitionprocess
22: Tabletop unit hot air/ floor unit hot air top
32: Tabletop unit steam/ floor unit steam
42: Floor unit hot air bottom
Is thegas supply open?
Connections OK?
Automatic burner control unit for ignitionelectrodes
Automatic burner control unit for gas valves
Dynamic and static gas pressurehardlyshow any
difference?
Serviceerror 32.1
Insulation damagedor ignitionspark visible?
Clearance > Min. values?
Open thegas supply (exhaust system in operation?).
Establisha connection. Use contact greasewherenecessary.
Replacethegas valve.
Replace theignitionelectrode.
Replacetheignitionelectrode.
Switchthe unit to thegas typedeclared on the
nameplate.
Note: Repeat fluegas check required!
Conditionof the burner OK? Replace theburner.
Doesthe connected gastypematchwhat is indicated
on the nameplate?
Checkthe insulation of the ignition cablefor damage and also check for electric arcs outside the
burner during operation.
No
Checktheclearanceof theignition electrodeto the return electrodeand the clearance of the
ignition electrodeto theburner.
No
Yes
Yes
Yes
No
No
Yes
No
Yes
No
No
Gas reset
Yes

1
Service error:32.2
Error tree: Gascombustion system
Service error: 32.2
Unit type: iCombi
V01· 05/2021· RTS/Shof · en-GB
Error inthe gas combustion system
"Lockout error" → gas reset requiredafter the error is resolved
Serviceerror 32.2
Flame recognition faulty
Gas error 17, 18, 27, 28, 37, 38
Flame current >2µA during pre-ignition or within 10 s after the end of the heatrequest
17, 18:Tabletop unit hot air /floorunit hot airtop
27, 28: Tabletopunit steam / floor unit steam
37, 38: Floor unit hot air bottom
Short circuit to earth on theignition electrode?
Serviceerror 32.2
Replacethe automatic burner control unit.
Replacethe ignitionelectrode.
Switchthe unit to thegas typedeclared on the
nameplate.
Note: Repeat fluegas check required!
Doesthe connected gastypematchwhat is indicated
on the nameplate? No
Yes
No
Gas reset
Yes
Doesservice 32.2 still appear? Replace thegas valve.Yes
No

2
Service error:32.2 V01 · 05/2021 · RTS/Shof · de-DE

1
Service error: 32.3
Error tree: Combustion unstable
Service error: 32.3
Unit type: iCombi
V01· 05/2021· RTS/Shof · en-GB
Error inthe gas combustion system
"Lockout error" → gas reset requiredafter the error is resolved
Service32.3
Combustionunstable
Gas error 19, 29, 39
During a heating request (HA is permanentlyon), theburner goesout 5 times during the burning
phase.
19: Tabletopunit hot air / floorunit hot air top29: Tabletopunit steam /floor unit steam
39: Floor unit hot air bottom
Flame current fluctuating heavilyor verylow(<6µAat max
power)?
Serviceerror 32.3
Air hose and/or flue gas evacuation blocked?
Gas supply too small or too manyparallel consumers, gas
tank too cold
Switchthe unit to thegas typedeclared on the
nameplate.
Note: Repeat fluegas check required!
Doesthe connected gastypematchwhat is indicated
on the nameplate? No
Yes
No
Gas reset
Yes
Burner and/or ignition electrode faulty? Replacethe burner or the ignition electrode.
No
Yes
Free the air hoseor the flue gasevacuation from the
blockage or replace the parts if necessary.
Heat exchanger and/or steam generator faulty? Replacethe heat exchanger or the steamgenerator
Replacethegas blower and thegas valve
No
Yes
Yes
No

1
Service error:32.4
Error tree: Gas blower speed
Service error: 32.4
Unit type: iCombi
V01· 05/2021· RTS/Shof · en-GB
Error inthe gas combustion system
"Lockout error" → gas reset requiredafter the error is resolved
Service32.4
Gas blower speed faultyGaserror 20, 30, 40
Themeasured speed ofa gas blower deviates from the target speed by150 rpm.
20: Tabletopunit hot air/ floor unit hot air top30: Tabletopunit steam / floor unit steam40:
Floor unit hot air bottom
Serviceerror 32.4
Replacethegas blower.
Switchthe unit to thegas typedeclared on the
nameplate.
Note: Repeat fluegas check required!
Doesthe connected gastypematchwhat is indicated
on the nameplate? No
Yes
Gas resetReplacethe automatic burner control unit.

1
Service error:33.1
Error tree: Automatic ignition controller
Service error: 33.1
Unit type: iCombi
V01· 05/2021· RTS/Shof · en-GB
Error inthe gas combustion system
"Blockingerror" → after the error has been resolved, automaticreset
Service33.1
Internal error automatic burner control unit
Gas error 46, 47, 49, 52, 55
Internal error ofthe automatic burner control unit,
which canusuallybe remedied witha restart
Unit alreadybeen restarted?
Switchthe unit off and onagain.
Replacethe automatic burner control unit.
Switchthe unit to thegas typedeclared on the
nameplate.
Note: Repeat fluegas check required!
Doesthe connected gastypematchwhat is indicated
on the nameplate? No
Yes
No
Yes
Serviceerror 33.1

1
Service error:33.2
Error tree: Automatic ignition controller
Service error: 33.2
Unit type: iCombi
V01· 05/2021· RTS/Shof · en-GB
Error inthe gas combustion system
"Blockingerror" → after the error has been resolved, automaticreset
Switchthe unit to thegas typedeclared on the
nameplate.
Note: Repeat fluegas check required!
Doesthe connected gastypematchwhat is indicated
on the nameplate? No
Yes
Service33.2
Initialisation error automatic burner control unit
Gas error 48
Automatic burner control unit wasnot correctlyinitialised:
Fan speeds incomplete or
Start speed < Min. speed or
Start speed > Max. speed
BUSconnection intact?
Arethe gas speedscompletely present inthe
servicemenu?
MIN < START < MAX
Use the Recovery software.
Yes
CheckthecompleteBUS connection
(all BUS connectors)
No
Changethe gastype, switch theunit off and on again,
set theoriginal gastype, switch the unit offand on
again.
Note: TheTechAssistantApp is requiredto changethe
gas type.
Yes
No
Serviceerror 32.2

1
Service error:33.3
Error tree: Automatic ignition controller
Service error: 33.3
Unit type: iCombi
V01· 05/2021· RTS/Shof · en-GB
Error inthe gas combustion system
"Blockingerror" → after the error has been resolved, automaticreset
Service33.3
Mainsfrequency errorGas error 45
Serviceerror 33.3
Switchthe unit to thegas typedeclared on the
nameplate.
Note: Repeat fluegas check required!
Doesthe connected gastypematchwhat is indicated
on the nameplate? No
Yes
Mainsfrequency outsidethevalid range
of 40...70 Hz?
Checkthemainsfrequency, switch the unit off
and onagain.
Yes

1
Service error:33.4
Error tree: Automatic ignition controller
Service error: 33.4
Unit type: iCombi
V01· 05/2021· RTS/Shof · en-GB
Error inthe gas combustion system
"Blockingerror" → after the error has been resolved, automaticreset
Serviceerror 33.4
Switchthe unit to thegas typedeclared on the
nameplate.
Note: Repeat fluegas check required!
Doesthe connected gastypematchwhat is indicated
on the nameplate? No
Yes
Service33.4
PolarityerrorGas error 44
Phase(L) and neutral conductor (N)
interchanged?
Switchthe phase (L) andneutral conductor (N)
(reversethe safetyplug connection).
Yes