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8
FAULT FINDING CHART
PROBLEM
8.7.
Explosive ignition
8.8.
Gas control tap stiff
(User's)
8.9.
Low Water Temperature
8.10.
Burner stays on
8.11.
Yellow Flames -
Soot Formed
8.12.
Unstable Flame
8.13.
Heating Body Noise
8.14.
Fan Noisy
8.15.
Insufficient Water
CAUSE
REMEDY
i) Pilot too small
ii) Slow ignition not adjusted
Check pilot tube and injector
Check and adjust (see 5.3)
i) Grease dried
ii) Operating mechanism replaced
incorrectly
Clean and regrease
Refit
i) Water rate too high
ii) Insufficient gas flow
iii) Water governor sticking
iv)
Incorrect venturi
v)
Main burner injector dirty
Check water governor
Check rate and if user's tap is open
Remove and clean or replace (see 6.7)
Replace (3.65 mm) (see Section 7.4)
Clean or replace (see Section 6.2)
i) Air in pipework
ii) Gas valve stays open
iii) Dirt on gas valve facing
iv)
Dirt or foreign matter
in water section
v)
Loose jumper on house
stock cock tap
VI)
Check-valve
fitted on supply pipe
Check for dead legs
Clean and grease gas spindle
Strip and clean gas valve
(see Section 6.6)
Clean water section
Replace water stop tap or pin
down jumper
See Section 4.1
i) Heating body fins blocked
ii) Primary air supply restricted
iii) Wrong injectors
Remove heating body and clean
(see 6.4)
Check burner manifold and clean
(see 6.2)
Check injector sizes and gas rates
(see Section 1.3) technical data
i) Fan not switching to high speed
ii) Water in gas line
iii) Faulty flue
See section 8.6
Drain and purge
Check terminal position and flue ducts
(see Section 3.3)
i) Scale
ii) Excessive gas
iii) Insufficient water flow
Descale heating body
Check gas pressure (see 1.3 and 5.2)
See Section 8.15
i) Fan remaining at high speed
See Section 8.3
ii) Fan out of balance
Replace (see 7.7)
i) Water service tap closed
ii) Blocked venturi
iii) Low water pressure
iv) Water governor faulty
v)
Water governor sticking
vi)
Foreign matter in water section
vii)
Water filter blocked
Check it is fully opened (see 3.5)
Remove and clean venturi (see 7.4)
Check water pressure
(see Section 1.3)
Change governor
Remove and clean or replace
(see 6.7)
Remove and clean (see Section 7.4)
Remove and clean/replace
(see 3.5)
23
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