Ferroli Optima 701

I have the above named combi boiler which has developed a problem with DHW heating, most notable when the shower is in operation, although it can be felt when the taps are run but to a lesser degree (Probably due to amount of flow/amount of body imersed). The water temperature drops off then picks up again in a continuous cycle. On observing the boiler it can be seen that the flame intensity reduces then intensifies, this ties in with the temperature fluctuations. The area I live in is generally thought to be soft water, so I'm not sure if a Heat Exchanger flush would be prudent? Any advice that relates to this type of defect/boiler is much appreciated, thank-you.

 

Thanks for a swift reply, have conducted insulation resistance test IAW manufacturers instructions and the 'IR' readings appear to be correct?

 

The central heating appears to be working correctly.

 

Have swopped the sensors, no change to the defect noticed.

 

There appears to be no difference whether the heating is in use or not. Carried out your suggestion of leaving heating off and then calling for DHW, with nothing untoward being observed.

 

Sensors have been swopped and to the best of my knowledge proved correct. The boiler as far as I can see there is no diverter Vv, but a double Cct Heat Exchanger.

 

Bit of Advice thank-you for taking the time to reply, much appreciated.

 

Yes, this is the manual that I have been working from, but to no avail, I really am running out of ideas now.

 

I think you are right, as I've just about run out of ideas.

 

Your right, not to easy to find literature on the web for this type of boiler, Any suggestions