Rational iCombi Pro Troubleshooting Manual page 47

Error tree: Level electrode S2 detects no resistance
Service error: 120
Unit type: iCombi
Water flow rate Y1 very low
Yes
Is there a sufficient amount of water at the unit
water tap connection? (min: 12 L / min)
Yes
Dirt filter on the unit connection is clean
Yes
Water flow rate Y1 very low
Service error: 120
After filling the Care chemical and control Y1, the level electrode S2 does not recognise any water level.
Result: Steam generator cannot be rinsed!
Chemical residues remain in the steam generator.
Water tap open. Water tap OK?
Activate solenoid valve Y1 Filling.
Yes
Check steam generator filling path Are the Combi water box, pump
housing (SC pump), demand branch, inlet hose from the solenoid
valve, hoses CWB to pump clean?
Reset faults by successfully running the abort programme
Display Service 120
Yes
In the functional test
Yes
Solenoid valve open
No
Check voltage input on
conducting path
Yes
No
clean
1
Check water filter, pressure and hoses
No
Functional test not selectable
No
Yes
Pull the bus connector from the motor or circuit
board and force Service 34
Yes
In Service Mode
Abort process and fill steam generator with
functional test Y1.
Water flow rate sufficient
Yes
Yes
Check Function/Wiring /Connection of level
electrode
Logic error check plug and cable or replace circuit
board
No
Change 5-fold solenoid valve
V03 · 5/2021 · RTS/Bret · en-EN