No hot water Ferolli Optimax he31c

[Backboiler]

Went to this boiler tonight with reports of no hot water; heating ok. There were no fault codes. Sure enough heating working but no hot water when there's a demand. The manual for this piece of crap is useless as there is no info for changing parts or fault finding guide. Couldn't contact Ferolli tech support as it was 7pm. Anyone have any ideas what to check?

 

[Backboiler]

Anybody?

 

[zeebeedee]

Don't know this boiler. What's on it? What tells the boiler there's a hw demand? Switch or stat? Is it firing at all in hw?

 

[diamondgas]

Not seen the boiler or played with it but take a step back and think 'Backboiler' ............. What you expecting to see/hear? What you expecting to happen? Ask the custard what's been going on!

I wouldn't jump to the impression of "crap", maybe more that your not familiar with the boiler and it's installation and/or house is not the best to be working with/in?

I'd be more thinking about what detects hot water flow 🙂

Can't be of much more help without checking out the mi's TBH 🙂

 

[Backboiler]

Don't know this boiler. What's on it? What tells the boiler there's a hw demand? Switch or stat? Is it firing at all in hw?

Not firing at all on DHW demand. I think a flow meter tells the boiler of the demand. The flow meter has three wires attached. Ground, 5v and Out. Is it a matter of linking 5v and out which will prove the switch or not?

 

[R1CKY]

Is this the newish Ferolli, the one with the awkward to use display panel in the bottom left? If so, I believe these use a flow sensor and motorised diverter valve.

Does the tap symbol on the display do anything on demand? Does the boiler fire up on demand? If no to either of these, its likely to be the flow switch.

Not sure if these flow switches work in the same way as the older black ones. The black ones were just a magnetic switch, the magnet would rise to the top of the switch body and make the switch, which would then fire the boiler. They sometimes get dirt in them and they stick in the no flow position, cleaned a few out successfully.

 

[Deleted member 44451]

i had a problem with a ferolli i think it was optimax, no hot water and the prob was the diverter valve. im a bit vague because parts center couldnt ge me one for three weeks and i told the cust to go to bgas . they wouldnt take it on because they had about 70 diverter valves on back order and so cust went back to ferroli and eventually they sent one of there agents around to replace it. your boiler might have a 10 year warranty on it worth checking.

 

[AMGasServices]

I had one the other day but it was giving me red hot water (so hot that I could make a cup of tea with the water) but the CH wasn't working and it was showing d2 it was passing through the loop but the radiators won't getting hot. I changed the diverter valve it solved the problem.

I think the diverter are common on the optimax.