Advertisement
66 ALTERNATING 'L' AND '6' - FALSE FLAME LOCKOUT
Restart the boiler, does Boiler Work OK?
Separate the flame detection electrode in-line
connector. Is there continuity between the terminals
pins connected to the electrode?
RESTART PROCEDURE - To restart boiler, turn mode knob to restart position and immediately turn knob back to required setting.
67 ALTERNATING 'F' AND '1' - 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)?
Are connections on water pressure sensor secure?
68 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 47). 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.
69 ALTERNATING 'F' AND '3' - 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?
Is there 230Vac at the Blue and Brown connections
to the 3 way connection on the Fan?
52
FAULT FINDING
NO
YES
Is the Gas Pressure available at
NO
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 48) Are these
functioning correctly?
Check ignition electrode and associated
harness for: continuity, visual condition
and position. (Refer to Frame 46) Are
these functioning correctly?
Check siphon and condensate drain pipe
work for blockage and rectify if necessary.
Boiler now working OK?
YES
Check routing and integrity of internal boiler
YES
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
YES
Replace water pressure sensor
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
NO
YES
Check gas supply and
rectify fault
Check wiring from gas
valve to PCB for continuity.
If the wiring is OK then
replace the PCB
Replace Spark Generator
and Harness as necessary.
Replace Ignition
Electrode and
associated harness as
necessary
Replace Gas Valve
Rectify Wiring & connections
Replace PCB
Replace Fan
Installation and Servicing
Advertisement
