Hi. Had a code 10 on my Vokera UNICA HE boiler. This was due to the overflow pipe freezing up. The pipe has been disconnected from the boiler and the boiler pipe is now dripping into a bucket. However, the boiler is now refusing to fire up at all. It keeps trying to fire up but it eventually gives up and gives a code 10 again. Any advice on the problem at alll? Thank you.

I had exactly the same problem , frozen condensate drain on unica he combi, so cut pipe inside let water drain into bucket and reset expecting it to fire up but after many attempts no joy back to code 10 then mopped all the water up inside bottom of combustion chamber tried again no joy. tried looking through man instructions for any clue of a solution but no. so googled "unica he code 10" then found this post. went to boiler pulled the clear pipe off which runs from right side of bottom of combustion chamber to the gas valve ( not a pump) a small amount of water came out I blew through pipe reattached and reset voila succees why is this not mentioned in the man instructions. Anyway many thanks Schminker most helpful post I ever read Mery Christmas. Bob Tallon Gas Fitter. I had exactly the same problem , frozen condensate drain on unica he combi, so cut pipe inside let water drain into bucket and reset expecting it to fire up but after many attempts no joy back to code 10 then mopped all the water up inside bottom of combustion chamber tried again no joy. tried looking through man instructions for any clue of a solution but no. so googled "unica he code 10" then found this post. went to boiler pulled the clear pipe off which runs from right side of bottom of combustion chamber to the gas valve ( not a pump) a small amount of water came out I blew through pipe reattached and reset voila succees why is this not mentioned in the man instructions. Anyway many thanks Schminker most helpful post I ever read Mery Christmas. Bob Tallon Gas Fitter.