IDEAL LOGIC + Combi 24 Installation And Servicing page 59

83 FLAME LOss - 1 ChECK OThER gAs AppLIANCEs WORK -
2 CONTACT INsTALLER
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 55). 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.
84 FAN FAULT - CONTACT INsTALLER
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?
Replace Fan
+
Ideal Logic Combi -
FAULT FINDINg
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 56) Are these functioning
correctly?
Check ignition electrode and
associated harness for: continuity,
visual condition and position.
(Refer to Frame 54) Are these
functioning correctly?
Check siphon and condensate
drain pipe work for blockage and
rectify if necessary. Boiler now
working OK?
YES
YES
Installation and Servicing
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
Rectify Wiring &
connections
NO
Replace PCB
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
59