Why does my hot water only work when the heating is on?

It is common for a faulty diverter valve to only become apparent in the warmer months once the central heating is not needed. If hot water only comes out of your taps when the central heating turns on, it is likely that the diverter valve is not diverting hot water properly.

Is the Viessmann vitodens 100W shower Hot?

I have a combi Viessmann vitodens 100w which does not give the hot water constantly, we have moved in to the house 6 months ago and when during the summer months it’s not a big issue, during the winter it would be nice to have a constant hot water in the shower.

When did my Viessmann central heating system start?

My boiler (and entire central heating system) was installed and first used in August 2009. In February 2011 the hot water began fluctuating hot and cold. The boiler still under warranty was repaired by Viessmann with a new heat exchange plate which was blocked with sludge.

Why does my Viessmann hot water heater fluctuate?

In February 2011 the hot water began fluctuating hot and cold. The boiler still under warranty was repaired by Viessmann with a new heat exchange plate which was blocked with sludge. They replaced this part under warranty and the system worked correctly again.

What should I do if my Viessmann boiler freezes?

If this does not melt the ice inside, you may try using a hot water bottle or hot towel. This will allow constant heat to the frozen area for a longer period of time. Hopefully, you will now see water leaving the pipe or hear a new sound, “trickling”. Next step is to reset the boiler, if you have succeeded the fault code will disappear.