vaillant sine vcw 18T3WFH

[rainbow6]

My boiler doesn't fire up. Suddenly stopped working.
Pilot light is on; Electrics seem 'on'; Room thermostat clicks and I can hear the solonoid click above pump; pump seems free to rotate. It has been squeaking on start up recently but runs quiet within 2-3secs. Pressure 1.5bar.
I have just finished refitting cabinets having sorted a leaking pressure vessel problem and did accidentally press green or red buttton. What do these do?
I have seen other posts requesting a link to where a manual for this model could be viewed. I have found one on this site but my model was not listed. It would be very helpful if I could consult one. Are there any other sources?

 

[kevplumb]

accidentally press green or red buttton. What do these do?

make sure they have come back out all the way

I have seen other posts requesting a link to where a manual for this model could be viewed. I have found one on this site but my model was not listed. It would be very helpful if I could consult one. Are there any other sources?

e mail adress would be handy

 

[rainbow6]

my email is (see profile)

thanks.



I've found out the green is for re-lighting but what does the red one do?
I'll have to check tomorrow if they are fully out.

 

[kevplumb]

red one turns the pilot off

if its not right out the boiler wont work

 

[glasgowgas]

remove your email address and put it in your profile


unless you want the bank of uganda emailing you some lovely offers

 

[compheat]

the sine 18 is very susceptable to air locks, as the system been drained or rad removed ? also there is a overheat cut out button on the right hand side of the control box near the back.

 

[Agile]

There are switches behind the green button which can get dirty.

Resetting the green button might recontact these if thats the problem.

There is also a mechanical bit that can get stuck.

This boiler is 20+ years old and over due for replacement. They are quite repairable by those few who understand them.

Tony

 

[rainbow6]

Thank you everyone for your responses.

I went and checked the red button position and it is fully out, as is the green button. However, bearing in mind the 'mechinical bits that can get sticky' I think I'll check behind the face plate.

The boiler was installed 1983. It looks in excellent condition and I thought I'd stick with it before investing in £800 of replacement excluding any labour etc. I expect it is not as efficient in its heat exchange unit compared to modern ones but it would have to save over £80-100 per year to just break even. However, if repairs are going to be expensive then the equation changes.

Air locks???......I've just fitted 6 new TVR's so the system has had some drain down but not more than a bucket. I have refilled the system and bled the rads where I can and very little air came out. (I switched the valves off and tipped the rads to allow for easy fitting of TVRs). I haven't touched the pressure vessel as I had previously done this and I assumed the pressure would remain okay. Perhaps this is not the case? Should I re-do this? ie; drain down, pump up and re-fill?

 

[Agile]

Now you tell us you depressurised the boiler!

It could well have been air in the boiler or someone turned on a hot tap while there was no pressure.

The overheat stat has possibly tripped! Thats in a rubber boot to the back right of the diecast box containing the PCBs. You need to push it it. It can just be done with a smaller hand or with a stiff bar or large screwdriver.

DO NOT drain it yet again! I have no idea why people want to do that when they have air in a system but I see it over and over again! The whole idea is to get the air OUT not fill it up with air!

Tony

 

[rainbow6]

yes, I did turn on the hot tap while there was no pressure!

I'll get on to it this evening and follow your 'repair' directions'

Thanks

 

[rainbow6]

I've been and done it!
Wow, quick press and relight the pilot light and off she went with no squeaky pump, at present.

Thank you, thank you.