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8
8.1.
8.2.
8.3.
8.4.
8.5.
8.6.
FAULT FINDING CHART
PROBLEM
CAUSE
REMEDY
Pilot does not light
i) Gas service cock closed
ii) Air in pipe
iii) Pilot injector blocked
iv)
No ignition spark
Open sewice cock
Purge line
Clean or change
Check electrode,
lead and ignitor
Poor Pilot Flame
i) Pilot injector dirty
ii) Wrong injector
iii) Pilot head blocked
iv)
Faulty pilot tube
v)
Pilot injector loose
Clean or change
Change for correct diameter (0.23)
Clean
Clean or replace
Tighten
Pilot only
i) Micro switch out of adjustment
a) Check micro switch high speed
operation, see Section 5.4
b) Adjust micro switch, see Section 7.13
Pilot will not stay alight
i) Pilot flame poor
ii) Fan running at high speed
iii) Thermocouple
not working
iv)
Thermoelectric
valve faulty
v)
Gas pressure low/variable
vi)
Terminal wrongly positioned
vii)
Badly assembled flue
viii)
Pressure switch out of adjustment
ix) Pressure switch faulty
x)
Plugs loose on PCB
xi) PCB faulty
(See 8.2) Above
(See 8.3) Above
a)Check
connection
clean and tighten
as necessary
b) Replace it output less than 8 mv.
Replace if drop out greater than 5 mv.
Check at inlet to appliance
(see 5.2)
Re-position (see 2.4)
Re-fit check sealing
a) Check operation (see 5.5)
b) Adjust (see 7.11)
Replace (see 7.10)
Secure
Replace (see 7.8)
Main burner does not light
i) Gas service cock not open fully
ii) Gas pressure low
iii) Water flow rate low
iv)
Gas valve not opening
v)
Diaphragm
punctured
vi)
Venturi blocked or loose
vii)
Gas control tap faulty
Open fully
Check at manifold and at inlet with
the apppliance
running (see page 3
and 5.2)
Check if water rate is sufficient
(see page 3)
Check (v) and (vi)
Change diaphragm
(see Section 7.5)
Check venturi
Check operation of User's gas
control tap
viii)
Slow ignition device screwed
fully home
Adjust (see 5.3)
Burner goes out
on hot water demand
i) Fan not switching to high speed
a) Check micro-operation
(see 5.4)
b) Adjust micro-switch (see 7.13)
c) Micro-switch defective
-
replace (see 7.12)
d) Fan defective - replace (see 7.7)
ii) Pressure switch out of adjustment
a) Check pressure switch operation
(see 5.5)
iii) Low pressure tube detached
iv)
High presssure tube blocked
v)
Flue blocked
vi)
PCB faulty
b) Adjust pressure switch (see 7.11)
c) Pressure switch defective
-
replace (see 7.10)
Refit or replace (see 7.10)
Check and clean (see 7.10)
Check and clear, and ensure that the
flue declines from appliance
(see 3.2)
Replace (see 7.8)
22
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