Overheating Issue in Viessmann Vitodens 050 Boiler: Exchanger Water Contamination & Hard Water

Hello,

I would like to ask for a wise head for advice. I talked to a few "professionals" and their theories are not correlative.

In December last year, I moved into a new home. The developer has equipped the house with a two-way Vitodens 050 boiler.
After about 3 months of trouble-free use, there was a problem with hot water, that is, while the bath was running hot from the cold alternately, it was possible to come to a conclusion that the stove does not give water heating. Day by day it was getting worse and worse, and the bath in the hot reins bordered on the miracle.

I called the Veissmann service after a few hours came service, 15 minutes burying at the stove and said that the exchanger got water contaminated, in addition, everything indicates that the water is quite hard and stone is lost while heating so that the stove is unable to heat water to temperature prediction. For 5 minutes, the cold water exchanger rattled (I saw a lot of shit out) and mounted. I paid PLN 180 for this service (I did not expect it, I thought it would go on warranty) but I can blame you for warming up the bath. In addition, I was informed that such cleaning will have to be done once a year because the stone will start settling again after some time.
Such explanation made sense to me.

Unfortunately, after 2 weeks (?!) The symptoms began to repeat. There was less and less water during the bath time. I called the service technician who cleaned the exchanger cleanly, informed me that the fault of dirty and hard water and just cleaning the cop could not help, I need to clean the water that is already in circulation because it looks like dirty water has been put into circulation (the cost of this service is 1000zl).

So I decided to call the developer, explaining that there is dirty water in circulation that got there before starting the boiler. The developer gave me the information on a professional who started the stove. After a week he came, he said that the technician's service is wrong because there is a filter in front of the stove and the contaminated water gets stuck in there and it's an olal topic because you should have to drink the exchanger in vinegar or other pre-work. Then he pulled out the heat exchanger (this time I watched well to know for the future) and for 15 minutes we exchanged the exchanger with vinegar. He also said that these boilers are allergic to hard water, but rinsing in vinegar will solve the problem for a year. In the meantime, we measured the amount of water (poured 18 drops into a test tube with tap water and said it was very hard). The service did not priced but I gave him 50 zlotys.

Unfortunately, after a week, the same ... came 3 expert (from the developer but not the same as running the water) said that the stove "goes into overheating" through hard water and you need to mount the conditioner.

Sorry for a long story but I wanted to describe it exactly. I do not know what to do anymore and who to escalate to. I asked the neighbors (8 houses each with the same stove) no other poki what does not have such problems, so I do not understand why only my stove can not cope with hard water.

If it was a problem associated with hard water, then the secondary heat exchanger would clog up rather on the DHW side, which would be a symptom of reducing the outflow in the taps. If you do not replace and do not always add water to the installation. The stone will settle somewhere in the first days of installation and then there is peace. As for me, dirty water and sludge or graphite shells in the exchanger (you did not write what kind of pollution) is the effect of electrochemical corrosion. I suggest cleaning the exchanger again and pouring a liter of electrochemical corrosion inhibitor into the installation (eg for one heater). The cost is less than PLN 100 and peace for a long time.

Thanks.

The last one I turned up the exchanger and the impurities look just like the grafi shells you mention. In addition, one side of the exchanger is pristine, while the other side (inside) looks like it was rusty. A few hours I soaked it with vinegar and heavily wyplukalem, a lot of it flew out. Poki what hot water flies without interruption. I also reduced the water temperature to 43 degrees.

I will join the discussion. For me, the problem appeared exactly after one year, the day after the review.

It warms up the water very long 5 times longer than before and the collection point is about 1.8 m from the boiler, counting on the pipes. With longer water intake, the cold starts to fly and then heats up to a very hot one.
Question - should the service technician clean the exchanger during the inspection?

Edit: 30/10/2017
After the service visit.
Exchanger cleaned, flew a lot of graphite-brown crumb. It is better but not as it was at the beginning.
Now it heats the water for a long time, but it does not modulate almost 80 degrees as it was before.

As far as I know, this service will not replace you exchanger, because it's the dirty water, delete PLN 140 for cleaning and after a few months the situation will happen again.

After six months, I pulled out my toilet again, cleaned it and flew out a lot of graphite dirt. I soaked for an hour in vinegar. Unfortunately, the effect was worse, even bigger problems with hot water. I pulled out again and parted it a bit better but not perfectly. You can see that the exchanger is heavily stoned and you need something stronger to clean. What will you recommend? Maybe a company deals with it professionally?

In 2 weeks, my boiler ends the year so I am waiting for a mandatory paid review ... but I do not expect miracles.

Interesting how it ended? Did you give the advice to clear?