Vaillant VCW-sine 18T3WFH Repair or replace????

[stevenfinn]

My combi boiler gas ceased to function. Worked yesterday - dead today. The main burner fails to fire up for either hot water or heating. The C/H circ pump also ain't starting. All the lights are on the switches + the pilot light is ignited. There are 2 x 2A fuses in the panel + these are OK.
Any other likely causes for this failure that are relatively easy to investigate/repair?
Is it worth getting Vaillant engineer to look at (£210 fixed fee) or am I better off going for a more efficient new model?

 

[corgiman]

Get Vaillant on fixed fee

I love these things and they do go on and on

but if they breakdown (specially the pcbs) they can be bloody dear to fix and take awhile to get the parts

 

[Agile]

Is there power going to the pump?

Is the rotor free to turn?

I am very comfortable with these and find most faults fairly easy to manage even with a slightly restricted spares availability.

Sometimes I wonder if I should do a short course on how they work and fault finding with them?

Tony

 

[corgiman]

I dont find fault finding hard either (usually a sticky servo )

parts are very dear these days is my point so best to go for the fixed rate by vaillant

 

[stevenfinn]

Thanks for the replies.
Found a high temperature reset on the wiring diagram, pressed the reset, 'click' - back in business.
Would have paid £210+vat for the Vaillant engineer to do the same.
How gutted would I have been............?

 

[Ashwood Heating]

Remerber there may be a reason why it overheated. Dont count your chickens just yet, Bigboy..Done

 

[Agile]

Overheat is often following letting the water pressure get too low.

I thought the pump still worked on these even when the o/h stat had tripped? But its a long time since I needed to reset one.

Tony

 

[BOBBUCKINGHAM]

Hi Steve

I've got the same problem as you had with your Vaillant boiler and don't have/can't download the instruction manual from anywhere.

Can you tell me where the reset button is? I can see the diagram showing it, but can't work out where it is.

hope you can help - its a very cold weekend!

Steve

Thanks for the replies.
Found a high temperature reset on the wiring diagram, pressed the reset, 'click' - back in business.
Would have paid £210+vat for the Vaillant engineer to do the same.
How gutted would I have been............?