L6' - False Flame Lockout; F1' - Low Water Pressure; F2 Or Fn Or Ln' - Flame Loss - Zanussi ULTRA+ COMBI 30 Installation And Servicing

4.4 'L6' - FALSE FLAME LOCKOUT

Restart the boiler, does Boiler Work OK?
NO
Separate the flame detection electrode in-line connector. Is there
continuity between the terminal pins connected to the electrode?
RESTART PROCEDURE - To restart boiler, press and release RH push button.

4.5 'F1' - LOW WATER PRESSURE

Are the Boiler and CH System filled with water and all isolation and
radiator valves open (check pressure gauge is between 1 to 1.5 bar)?
Are connections on water pressure sensor secure?

4.6 'F2 OR FN OR LN' - FLAME LOSS

Does the boiler ignite for a short
time and then extinguish?
YES
Is the top flue manifold seal present
and correctly fitted. ?
YES
Check the detection electrode and
associated harness for: continuity,
visual condition and position
(Refer to Section 3.14). Check if
condensate pipe is blocked. Check
if flue is blocked.
Replace as necessary.
Re-fit correctly or replace
Installation and Servicing
SECTION 4 - FAULT FINDING
YES
YES
NO
Is the Gas Pressure available at
the Boiler Inlet (18 mbar)?
Is 24Vdc supply available at the
Gas Valve while the flame is on?
NO
Check spark generator and
associated harness for: continuity
and visual condition. (Refer
to Section 3.15) Are these
functioning correctly?
Check ignition electrode and
associated harness for: continuity,
visual condition and position.
(Refer to Section 3.13) Are these
functioning correctly?
Check siphon and condensate
drain pipe work for blockage and
rectify if necessary. Boiler now
working OK?
Check routing and integrity of internal boiler wiring is OK. Check
condition of Flame Sense Electrode and replace if deteriorated.
YES
Replace Flame Detection Electrode
NO
Check routing and integrity of internal boiler wiring
NO Fill and vent the system and open all
isolation valves
NO
Re-fit connections
Replace water pressure switch
YES
YES
YES
YES
YES
NO
Check gas supply and
rectify fault
Check wiring from gas
NO
valve to PCB for continuity.
If the wiring is OK then
replace the PCB
NO
Replace Spark Generator
and Harness as necessary.
Replace Ignition
NO
Electrode and
associated harness as
necessary
NO
Replace Gas Valve
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