Biasi M90F 24S combi boiler

[scotkemcat]

HI, can anyone help, I have a Biasi M90f24S combi boiler and over the last month having problems with the hot water going hot and cold. No problems with the central heating side, but cannot get the hot water to run consistantly.

Have tried running another tap along with the shower, but no change. Rang a local plumber but they never returned my call.

 

[twgas]

could be thermister but more likely to be the plate h/ex full of muck,

 

[scotkemcat]

many thanks, how can this be fixed? is it expensive

 

[twgas]

dont think termisters are repairable, just change them (if you can't test them), only a few quid.
The plate h/ex can be cleaned, if you know what you are doing, or, more easily exchanged for a new one.

 

[Agile]

On DHW the temp gauge should not exceed about 65 degrees.

If its much higher then its probably a blocked plate HE.

Tony