Vaillant Turbomax Plus 828e F60 Fault

[Kewat66]

Hi all,
I was asked to attend a faulty boiler. Turbomax Plus 828e. When i arrived customer said boiler has been working fine then stopped. Customer said fault code showing was F60 and according to manual states 'electronic defect'. He switched the boiler off and back on and then there was noting being displayed and boiler not working. New PCB board. This was fitted and all working as should.
I received a call the next day stating that the boiler worked fine for 8 hours then biler keeps going into lock out and F28 code now appearing. There are a few options on this but has anyone had anything similar happen to them and what was the solution as as the PCB board had gone was there a trigger or earlier problem that led to this?
Boiler now takes 3-4 goes at relighting then lasts about 45-60 mins then back into lockout,
Thanks
Kewat66

 

[IDCHAPPY]

No water in anything electric?
Looking at the manual it appears to be something ignition related, have a look at the ignition assembly and the possibly Gas valve.

 

[Rabbitman]

If you've changed the PCB you have to alter the little jumper plug to correspond with the make of gas valve, if not it buggers the ignition pressure setting........ It could be some thing else but certainly check the step (ignition) pressure

 

[Kewat66]

Thanks. How do you mean alter and where is this found?

 

[Rabbitman]

As you remove the cover to expose the pcb it's found on the rhs, it's not very big so good eyesight required its a black jumper plug that covers two pins......... If you have a Honeywell gas valve it covers 1&2 if it's a sit valve then 2&3 and check to see you have 3/4 millibar on ignition, fault may lie elsewhere and may just be a coincidence but if it's a sit valve they can sometimes stick and the Honeywell as a diode built into the lead but that generally kills pcb on first power up, hope this helps

 

[Kewat66]

Thanks for this. Will have a look.