26
Symptoms
F. Burner lights on pilot but
burner locks out after 3 -
4 seconds.
G. Smell of gas local to the
appliance.
H. Combustion noise
becomes louder, ame
becomes yellow. Boiler
door becomes hotter
than usual.
Possible Cause
1. Ultra-violet cell faulty
2. Ultra-violet cell is not receiving a
sufcient signal from the
ame
1. Leakage from pipe line joints or
pilot or that the main gas valves
are not gas tight.
1. Air inlet accidentally masked.
2. Air inlet damper position
moved.
3. Burner head parts have moved,
become worn or overheated.
4. Gas pressure alteration.
5. Boiler tubes, ue or chimney
blocked or restricted.
6. Door refractory failed.
Action
1. As B3
2. Clean cell and check correctly
inserted facing the ame
1. Switch OFF burner and check
pipe line joints with soap solution.
2. Close pilot manual valve and then
main manual valve at the burner
to see if this isolates the problem.
Call gas engineer to check the
automatic valves. Do not operate
until this has been done.
1. Clear obstruction.
2. Call Service Engineer to reset
and make a combustion check.
3. Call Service Engineer to adjust or
replace and make combustion
check.
4. Check and nd cause.
5. Check and clear restriction.
6. Replace if damage is severe.
Gas Burner Fault Finding Chart / 2
Gas Burner Fault Finding Chart
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