Ferroli Modena 80e, no DHW or CH - advice please?

[Mawoose]

Hi, wondered if someone could suggest what's causing the following symptoms.
If I turn the hot water tap on, or switch the CH on this is what happens:-
a) can here some relays switching over
b) fan doesn't start, boiler doesn't light or attempt to
c) indication on panel lights are as same as if boiler functioned correctly

I removed the cover from where the pcbs are located, reseated all connectors & boiler initially worked for a couple of days, then fault returned.

Poked around the smaller pcb & fault went, then returned 30 mins later, was using shower at the time & boiler stopped running & shower went cold. Not sure if I've answered my own question regarding what's causing the fault, or could another part of the boiler be also playing up?

 

[DirksPlumbing]

Sounds like the relays for the fan could be on its way out. That calls for a PCB change unless you source and solder the relevant relays yourself.
But do not quote me on this. I only guess remotely here.

 

[Mawoose]

Sounds like the relays for the fan could be on its way out. That calls for a PCB change unless you source and solder the relevant relays yourself.
But do not quote me on this. I only guess remotely here.

thanks, they could be the problem. One thing to note, when the boiler works ok, the start up sounds similar, relays then fan & ignition. The main relay has a clear cover on it so will note contact positions during a good start up & compare when it's not firing up correctly.

 

[bspareltd]

beware !!!!!!!! on the modena model main faults are venturi crumbling and thermisters , last of all the pcb .
When you take the cover of the pcb if there are burn marks on the left of the pcb ,then what can i say game over

 

[Mawoose]

beware !!!!!!!! on the modena model main faults are venturi crumbling and thermisters , last of all the pcb .
When you take the cover of the pcb if there are burn marks on the left of the pcb ,then what can i say game over

No signs of burn marks on the pcbs, slight 'scorch' marks on the relay cover, directly above the contacts - which is probably standard on a 14 year old boiler.

The thermistors are the origional ones, would they cause the symptoms I described? Also Venturi is origional one.

 

[bspareltd]

it looks like your pcb !

 

[RGII79]

dry solder pcb

 

[Mawoose]

it looks like your pcb !

Maybe, I'll replace the relay if its evident that its bust. The DHW & CH is working fine at the moment, just waiting for the fault to reoccur. Something is intermittent.

 

[theanalyst]

are you a gas safe engineer?