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15
FAULT FINDLING CHART
SYMPTOMS
FAULT
REMEDY
1.
Pilot
will
not
light
automatically.
No
spark
across
electrode gap.
(a)
Ensure that pizeo-
electric igniter is functioning
correctly.
(b)
Check that electrical
lead is not damaged.
2.
Pilot
will
not
light
automatically but points (a) to
(e) are satisfactory and the
pilot will light with a match.
Incorrect position of
spark in relation to
pilot gas flow.
Re-position spark plug so that
spark jumps across gas flow.
3. Heater will not remain alight
when pressure is released from
ignition button.
Electro-magnetic
valve closes whilst
heater is alight.
(c)
Ensure
that
thermocouple probe is located
in pilot flame.
(d)
Ensure
good
connection
between
thermocouple and valve.
(e)
Check thermocouple.
(f)
Check
electromagnetic
valve.(by
serviceman)
4. After changing to maximum
position with all three plaques
alight. One or more plaques
appear
below
normal
intensively.
(a)
Blocked jets.
(b)
Partially blocked
supply tube.
(a)
Remove and clean blocked
jet.
(b)
Remove
supply
tube,
remove jets and blow
through the tube.
5. Difficulty in cross lighting
from position 1 to position 2 or
3.
(a)
Air
draught
directed
away
from first plaque.
(b)
Position of the
pilot flame.
(a)
Change the location of the
appliance so that it is not
adversely affected by air
draught.
(b)
Position pilot so that flame
impinges across bottom
corner of 2
nd
plaque as
well as 1
st
plaque.
6. Smell of combustion.
Missing
piece
of
ceramic fireclay.
Inspect perimeter of each
plaque and locate place where
some
fireclay
has
been
displaced.
Turn to the local service
(REPAIR TO BE CONDUCTED BY AUTHORISED PRESONNEL ONLY)
Содержание HT-H-0003
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