Check Gas Valve And Central Heating System Pressure - Vaillant aquaPLUS VUI 362-7 Instructions For Installation And Servicing

Does burner light 1st
attempt?
No
Does burner light within 3
No
ignition attempts?
Yes
Check gas supply
Does burner light? No
Yes
Yes
Check burner pressure
settings are correct

Check gas valve and central heating system pressure

Is burner indicator
Yes
Reset boiler rectification lead and
Check/replace gas valve Is burner indicator
as necessary
Does burner light?
No
Replace electronic board
Does burner shut down after
Yes
illuminated? approx. 15 secs.
No
Check flame
Does status code (see page 38)
electrode
show S. 53?
Yes
Check water pressure in
central heating system, refill
illuminated
and vent. as necessary
Check pump is running?
Is 230 VAC present at the
No
pump plug connection?
Replace electronic board
Sheet E
No Go to sheet F
Yes
No
Yes Replace pump
No