Vaillant Turbomax Boiler Leaking

A customer of ours had a Vallaint Turbomax in a house that they recently moved into, which they had asked us to replace because of its age and inefficiency. They also wished for us to relocate the boiler to another area. The Vaillant Turbomax was of the VU/VUW range with the green control knobs. A week before we were going to replace it, a leak appeared from the underneath of the boiler.

The leak was only slow but needed immediate attention as the pressure was being lost from the system in less than a day. I could see that the water was coming from the right hand side of the boiler but could not see exactly as there was a panel on the underneath of the boiler. I opened the lower panel and dropped the controls down to see the diverter valve, etc. It was immediately obvious that the leak was coming from the automatic air vent, as there was water steadily appearing from the bleed pip.

I tried to screw the bleed pip down to stop the water from coming out of the cap but it would not seal. I dropped the pressure from the boiler and removed the top of the AAV. The float and mechanism of the AAV was fairly dirty and I may have been able to clean it up. However, I had a new AAV in the van which I dismantled and fitted to the boiler. This repair kept the boiler leak-free for another week and I was able to retrieve the AAV innards after replacing the boiler.

Disclaimer: The works described in this blog are a record of work undertaken and should not be taken as guaranteed to solve your problem. Work should only be carried out by persons qualified and competent to do so.