diverter valve issue

[Marco1976]

Hi,

When i turn off the hot water tap i can hear a sound in our central heating pipe like flowing water for a while. I'm told it could be the diverter valve.
How badly can this deteriorate? It has been doing this for a while.
We still have heating and HW.
We also seem to have a lot of air in the system, some of the rads regularly fill up with air.

Thanks

 

[Softus]

Does your boiler have a white case?

 

[mogget]

Does your boiler have a white case?

 

[Jazzynash]

can you give more details on this ?

 

[Softus]

can you give more details on this ?

Sure.

Basically, I was asking the OP whether or not his gas burning appliance has a metal casing that is painted white.

 

[cso30]

The easiest way to check this is wait until the heating and water have not been used for about an hour. Run a hot tap and feel if the central heating flow pipe gets hot when the tap is running or shortly after it has been turned off.

If it does get hot you have a faulty diverter valve!

 

[gizmo1]

The easiest way to check this is wait until the heating and water have not been used for about an hour. Run a hot tap and feel if the central heating flow pipe gets hot when the tap is running or shortly after it has been turned off.

If it does get hot you have a faulty diverter valve!

Can anyone please confirm that the above is a definite test for a faulty DV. If your heating flow pipe gets hot when heating is off and hot water is turned on does this definitely confirm a bad DV? In my case I'm still getting both heating and hot water but when I do both at the same time, quite often the boiler stops firing and gets the flashing ignition indicator. The flow pipe definitely gets hot even with the heating off.

 

[gasservice85]

I think what the guys above are trying to get across is all boilers are different ghis promblem COULD be the diverter valve but maybe not if you enlighten us the the make and model of your boiler we may be able to advise you.

For example a Viessmann combi will open the ch on hw mode if it gets too hot and wants to disperse the heat this is a result of poor flow/blockage

 

[ChrisOxford]

Does your boiler have a white case?

Nearly 20,000 posts and 5 thanks... but you made us laugh

 

[gizmo1]

I think what the guys above are trying to get across is all boilers are different ghis promblem COULD be the diverter valve but maybe not if you enlighten us the the make and model of your boiler we may be able to advise you.

For example a Viessmann combi will open the ch on hw mode if it gets too hot and wants to disperse the heat this is a result of poor flow/blockage

It's a vaillant Turbomax Vuw 242 1/e. Could the hot flow pipe possibly be caused by a weak/faulty pump causing the poor flow that results in the hot water being dispersed to the heating?

 

[gasservice85]

Possibly yes

 

[ChrisR]

Could the hot flow pipe possibly be caused by a weak/faulty pump causing the poor flow that results in the hot water being dispersed to the heating?

I'd say NO! The pump is common to both. It's notmal for the flow pipe to heat when the tap's turned OFF, but not before. DV diaphragm or seals.