Alternating L/6 False Flame Lockout; Alternating F/1 Low Water Pressure - IDEAL Logic Combi 35 User Manual

74 aLTERNaTINg 'L' aND '6' - FaLsE FLaME LOCKOUT
Restart the boiler, does Boiler Work OK?
NO
Separate the flame detection electrode in-line connector. Is there
continuity between the terminals pins connected to the electrode?
REsET pROCEDURE - To restart boiler, turn mode knob to restart position and immediately turn knob back to required setting.
75 aLTERNaTINg 'F' aND '1' - 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?
76 aLTERNaTINg 'F' aND '2' - FLaME LOss
Does the boiler ignite for a short
time and then extinguish?
YES
Check the detection electrode and
associated harness for: continuity,
visual condition and position (Refer
to Frame 49). Check if condensate
pipe is blocked. Check if flue is
blocked.
Replace as necessary
* note: due to the wave form of the rectified
voltage, the reading will vary depending
on the type of meter used to measure the
value. In general terms a reading greater
than 150V indicates that the correct voltage
is supplied to the gas valve.
54
Fault Finding
YES
YES
NO
Is the Gas Pressure available at
the Boiler Inlet (18 mbar)?
Is 215Vdc supply available at the
Gas Valve while the flame is on?
(* See note)
Check spark generator and
associated harness for: continuity
and visual condition. (Refer to
Frame 50) Are these functioning
correctly?
Check ignition electrode and
associated harness for: continuity,
visual condition and position.
(Refer to Frame 48) 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 sensor
YES
YES
YES
YES
YES
Ideal Logic Combi -
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
Installation and Servicing