Vaillant Ecotec plus 418 problems

[prjolliffe]

Help!!!!

I have a Vaillant Ecotec plus 418 boiler installed and its suddenly stopped working. The boiler is only two years old and I've had no problems with it so far...

I have no heating at all and the status code S.98 is being displayed and the hand book reports it as..

S.98 Flow-/Return sensor check is running, demand (DHW or heating) is blocked.

Any help or ideas would be appreciated.

Cheers

 

[Boilerman2]

Thermistor fault - did you have the boiler serviced at 12 months?
otherwise your warranty may be compromised!

 

[mickyg]

check your pump, header tank/system pressure

 

[simond]

Most likely pump stuck/failed, or no water, as Mickyg says.