Vaillant 831 not working

[goofy gorilla]

Hi guys - got a vaillant 831 ecotech ...woke up this morning ..boiler was off..display was off....left it unplugged for 10 minutes...then plugged it back in. Didplsy came on..went to wash face turned hot water on and it was cold...boiler went off again, blank display...then left it off again and plugged it in..display on...turned on heating , boiler trys to come on then display goes off again...no error codes, no rcb tripping any ideas..? Ta

 

[terryplumb]

PCB probably.

 

[goofy gorilla]

Oh dear..sounds expensive

 

[terryplumb]

You could explore getting a fixed price repair from vaillant ? Not sure what they charge these days.

 

[ianmcd]

I used the fixed price repair, they replaced the PCB and the fan, bargain at £270, that was few years ago though , not sure how much it is noe, @ScottishGasMan will possibly know

 

[ScottishGasMan]

Think its closer to £300-350 depending for fixed price, although they can do a contract with repair included to spread it over 6 month or year I think.

Its certainly not a DIY repair, and depending on age of boiler could be PCB or could be a few other things

 

[goofy gorilla]

had a gas safe guy look at it...said was the pcb board qouted around £250 supplyt and fit...will see coming tommorow hopefully..

 

[CBW]

Sounds like the 2010 model upwards, had a few pcb’s go on these.

 

[goofy gorilla]

Changed pcb board...getting f7 invalid device specific number....cant get to the d.093 screen to chsnge it...any ideas why...? I get to the last two instruction but after entering language to English it doesn't display the d.093 screen..

 

[picasso]

Can you take a screen shot of the instructions or provide a link ?

 

[goofy gorilla]

Its this one 831 eco tech plus 2..now it should automatically adjust the parameters cos I only changed the main pcb. The coding resistor is installed from the old board....strange it doesn't display the screen to change DSN..

 

[goofy gorilla]

Can you take a screen shot of the instructions or provide a link ?

 

[goofy gorilla]

https://myboiler.com/fault-codes/vaillant-ecotec-f70-repair/

 

[ScottishGasMan]

So when you were advised its clearly not a DIY repair you decided you knew better?

 

[goofy gorilla]

I'm afraid so...wasn't very had to change pcb board....anyway I managed to change dsn but boilers locked me out get this now..