Vaillant VCW Sine 18 T3WF

[MyJ456]

I have an old Vaillant boiler which has been brilliant over the years, it is now playing up.
When the central heating is selected it comes on but only reaches 60 on the temperature gauge and does not get the central heating warm everything appears to work as normal and the hot water is great.
Any ideas ?

 

[DP]

Get some one who knows, not claims to know this boiler, to attend.
This beauty will probably be one score 10, could have some defects that will render the boiler useless

Still have a heat exchanger for this boiler and some parts.
Have a client who has a working boiler on the wall and a spare on the floor

 

[MyJ456]

An engineer came out but recommended a new one as this is old and he knows nothing about them, he changed the differential valve, the gas came on fully when the valve was withdrawn and reinserted but made no difference.

Its strange because the hot water is great and the pump and everything work but no heat above 60.
How can I find someone who knows these boilers?

 

[jeff the gasman]

An engineer came out but recommended a new one as this is old and he knows nothing about them, he changed the differential valve, the gas came on fully when the valve was withdrawn and reinserted but made no difference.

Its strange because the hot water is great and the pump and everything work but no heat above 60.
How can I find someone who knows these boilers?

Post your location, someone will help. There's some very knowledgable people on this forum.

 

[Dan Robinson]

If you're truly lucky, and you're in Laaaandan, Tony will come to fix it for around £84

 

[Agile]

I charge £94 for Sine 18 diagnostics.

Not sure what the OP has said has been changed by "someone who knows nothing about them".

I almost always find there are two faults on them. They are very clever over complicated designs which can continue to give hot water using the preheat function if the normal parts are not responding.

Tony

 

[Dan Robinson]

A price rise? That came out of nowhere.

 

[jeff the gasman]

A price rise? That came out of nowhere.

Only cause he can't fault find them.