73
aLTERNa TINg ‘L’ aND ‘1’ - FLOW TEMpERa TURE OVERhEa T LOCKOUT
isolation and radiator valves open?
Fill and vent the system and open all
isolation valves, then reset boiler
Is the Flow/Return Differential across the Boiler in
excess of 30°C?
NO
the Differential now below 20°C?
NO
to Frame 47)
then reset boiler
NO
OK, now
reset boiler
74
aLTERNa TINg ‘L’ aND ‘2’ - IgNITION LOCKOUT
If the boiler is reset does the boiler
ignite for a short time and then
extinguish?
Check the detection electrode
and associated harness for:
continuity, visual condition and
Check if the condensate pipe is
Replace as necessary
NO
Check gas supply and
rectify fault
NO
Is 215Vdc supply available at the
Check spark generator and
associated harness for: continuity
correctly?
Check ignition electrode and
associated harness for: continuity,
(Refer to Frame 54) Are these
functioning correctly?
NO
Check siphon and condensate
drain pipe work for blockage and
working OK?
Check wiring connection
NO
Generator and harness
as necessary
NO
Replace Ignition
Electrode and
associated harness as
necessary
NO
Replace Gas Valve
* note: due to the wave form of the rectied 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.
between outside pins 4k Ω (± 2)?
Replace Gas Valve
NO
REsET pROCEDURE
REsET pROCEDURE
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