Keston 50 - GC Installation And Servicing Instructions page 33

WD50/2/1997
Continued from Sheet 2
Is there 230V at valve
Is there 230V at Gas Low
Press. Switch
Faulty Control Box - Replace.
Is there a spark present?
yes
Is the HT voltage present at
top of ignito electrode?
Is the spark gap 4 mm?
Electrode Fault y - Replace.
Does the burner ignite?
yes
Recheck gas output pressure.
Check HT lead is securely
fixed. Clean or replace burner.
Does flame stop after 5 - 10
Is boiler earthed correctly?
Are live and neutral supply
lines crossed at terminals L &
Faulty Control Box - Replace.
Installation & Servicing Instructions
Chapter 5 : Fault Finding
no
no
no
yes
yes
no
seconds?
yes
yes
N?
no
The Keston 50, 60 & 80 Condensing Boilers
yes
Faulty Gas Valve - Replace.
yes
Faulty Gas Low P ressure
Switch - Replace
no
Faulty Conrtrol B ox - Replace.
no
Replace/Adjust S park Plug.
no
Earth Boiler.
yes
Correct Wiring.
Page : 30
Continued on sheet 2