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WD51/2/1997 Chapter 5 : Fault FindingThe Keston 170 Condensing Boiler
Continue d fro m Sheet 2
Is there 230V at val ve
Is there 230V at Gas Low
Press. Sw itch
Faulty C ontrol B ox - Replace.
Is there a spark present?
yes
Is the H T v ol tage present at
top of igni tion electr ode?
Is the s park gap 4 m m?
Electrode Fault y - R eplace.
Does the burner ignite?
yes
Recheck gas output pressure.
Check HT lead is securely
fixed. Clean or replac e burner.
Does flam e stop after 5 - 10
seconds ?
Is boiler earthed correc tly?
Are live and neutral supply
lines crossed at terminals L &
Faulty C ontrol B ox - Replace.
Installation & Servicing Instructions
ye s
no
ye s
no
no
ye s
ye s
no
ye s
ye s
N?
no
Faulty Gas V alve - Replace.
Faulty Gas Low P ressure
Switc h - Repl ac e
no
Faulty C onrtrol B ox - R eplace.
no
Replace/Adjust S park Plug.
no
Earth Boiler.
yes
Correct W iring.
Page : 28
Contin ued o n sh eet 2
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