No hot water – help please

No hot water – help please



We have a grant vortex boiler connected to an oso hot water super coil (indirect) and an ufh system.

UFH works fine.

Everything was working fine until the summer when the UFH went off – now we do not have any hot water – even if we switch on the UFH.

a.) Not sure if it is the boiler circulation pump – if this was knackered would the UFH still work, could the UFH pump still circulate the water through the boiler. (Might be a daft question).



b.) The hot water valve seems to work, I took it off and it seems to operate fine but the pipe leading to the oso only gets warm to half way up (after the valve). Would an airlock stop the flow – there is a automatic vent on the return side of the coil. With it open no water or air seems to come out, i.e. screw removed.



c.) Fiddling with the thermostat on the coil seems to activate the valve/boiler.



What should I look for before calling for a plumber – using the immersion heater is becoming expensive ?





Thanks

 

yes, and it does not seem to improve things.

it would not seem it was the valve - but then it could be.

thanks

 

the boiler fires, I am not sure about the pump

how can i tell if that is working, the UFH works fine - if the boiler pump has failed surely the UFH would not work?

 

Will try that - although if the boiler circulation pump has failed would the ufh still work?

Thanks