Keston System s30, Installation And Servicing Instructions

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Installation and Servicing
SECTION 4 - FAULT FINDING
4.4 ‘L6’ - FALSE FLAME LOCKOUT
Restart the boiler, does Boiler Work OK?
NO
Check routing and integrity of internal boiler
wiring is OK. Check condition of Flame Sense
Electrode and replace if deteriorated.
Separate the flame detection electrode in-line
connector. Is there continuity between the terminals
pins connected to the electrode?
YES
Replace Flame Detection Electrode
Check routing and integrity of internal boiler wiring.
YES
NO
4.5 ‘F1’ - LOW WATER PRESSURE
Is 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)?
NO
Fill and vent the system and open all isolation valves
4.6 ‘F2’ OR ‘F n ’ OR ‘L n ’ - FLAME LOSS
Does the boiler ignite for a short
time and then extinguish?
YES
Is the Gas Pressure available at
the Boiler Inlet (18 mbar)?
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
NO
Check gas supply and
rectify fault
NO
YES
Is 24Vdc supply available at the Gas
Valve while the flame is on?
YES
Check spark generator and associated
harness for: continuity and visual
condition. (Refer to Section 3.15) Are
these functioning correctly?
YES
Check ignition electrode and associated
harness for: continuity, visual condition
and position. (Refer to Section 3.13) Are
these functioning correctly?
YES
Check siphon and condensate drain pipe
work for blockage and rectify if necessary.
Boiler now working OK?
Check wiring from gas
valve to PCB for continuity.
If the wiring is OK then
replace the PCB
NO
Replace Spark Generator
and Harness as necessary.
NO
Replace Ignition
Electrode and
associated harness as
necessary
NO
Replace Gas Valve
NO
4.7 ‘F3’ - FAN FAULT
Does the wiring from the Fan to the PCB have secure connections at
both ends and has not deteriorated? Does the wiring have continuity?
YES
Rectify Wiring & connections
Is there 230Vac at the Blue and Brown connections
to the 3 way connection on the Fan?
NO
Replace PCB
Replace Fan
NO
YES
YES
Are connections on water pressure sensor secure?
RESTART PROCEDURE
- To restart boiler, press the “RESTART” button.
NO
YES
Re-fit connections
Replace water pressure sensor