Vaillant ecotec VU 1206/5-5 F29 fault

[Soulman]

Hi guys,

Hoping one of you may be able to tell me something I've missed. Bank of 5 boilers, 3 out of 5 showing fault. All were serviced in the summer and were working fine. Until now. In summer boilers had full strip, new electrodes, gaskets, ionisation. All 5 then fired and tested after servicing and were fine. Condenstates are clean, boilers have gas, light for a few seconds then go out and won't relight. Swapped cable harnesses from ionisation of working to none working and still same.

Thinking it might be something simple I've overlooked, vaillant Techical went much use, they said good luck!

Any ideas?

 

[Last Plumber]

Gas supply temporarily stopped ? no prob with blocked filter ( external or in GV)
flue gas recirculation ?
condensate drain blocked ?
faulty earthing of boilers ?

 

[Last Plumber]

How are these 5 flued ?

 

[Soulman]

All have own seperate flue, distances are fine

 

[Last Plumber]

Have you checked gas supply ?

 

[Last Plumber]

What is WP before appliance fires and during firing ?

 

[Last Plumber]

Have you tried ( only asking ), firing them individually ?

 

[Soulman]

finally found cause, insulation pad has a securing plate, which somehow had worked its way loose and had dropped half way down the burner. No idea why this has happened on 3 out of 5 but least the problem has been found.

 

[Last Plumber]

finally found cause, insulation pad has a securing plate, which somehow had worked its way loose and had dropped half way down the burner. No idea why this has happened on 3 out of 5 but least the problem has been found.

Send an email to Vaillant.
May be a new fault they need to know about !

 

[Stoney Ground]

finally found cause, insulation pad has a securing plate, which somehow had worked its way loose and had dropped half way down the burner. No idea why this has happened on 3 out of 5 but least the problem has been found.

Had similar on a suprima 100L the other day initial readings off the scale, opened it up and half the burner covered with insulation board.