Biasi M90F. 24S boiler fault

[wolfman59]

new to all this
we have a biasi boiler. garda m90f. 24s.
the probolem is that when we turn on the hot water tap, the central heating radiators start to get hot even when its not selected ? the pump is running ? and we get reduced heat on the hot water ?? has anyone any idea ??, thanks

 

[kevplumb]

sticky / stuck diverer valve

 

[Agile]

The sealing gland on top of the diverter valve has probably leaked and damaged the motor.

Usually this will blow a fuse! Is your supply fuse 3A as it should be or is it 13A ?

If you remove the motor you can see if the base is wet and also see if the motor pim moves between hot water and heating as you selkect them.

The pin in the diverter valve should spring up to the DHW position when the motor is removed ! Does it? If not push it down a few times and see if it then comes up.

Tony

 

[wolfman59]

thanks for your help.
could a faulty diafram be the cause of the probolem ?

 

[kevplumb]

not with a motorised valve

 

[Agile]

thanks for your help.

could a faulty diafram be the cause of the probolem ?

Why do you ask that?

We have already told you what the most likely cause of the problem will be.

Tony

 

[wolfman59]

thanks for your help.
will check it out and let you know, thanks..