~
@J
Does burner light and
remain alight?
~
YES
~
]
~Vaillant
HEATING,CONTROLS,HOTWATER.
~NO~
N;B. For lockoat (Black
button & Red Neon)
problems when no flame is
visible check A to F.
T
t
\)~rnenflame is visible prior
to lockout checkFto H only
(a). Check gas supply to
appliance live and purged.
(b). Check differential valve
open (if no return to Q4).
(c). Check20v DC across
gas operator, if available
but operator fails to open
(audible click) change
operator.
T
t
(d). Check central heating'
overheat thermostat and
connection (should be
closed circuit, if open
change component).
T b " Pic22
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