vitodens 200 wb2 cycling/only running when in fullpower

[philbond07]

Hi all,

I'm sorry I have to write in this forum in English, but I'm from Belgium and speak only Flemish, French and English.
I can try to read Geman replies though.

Ok can somebody please help me out here?

I have a vitodens 200 wb2 7159008...
Since a few weeks the kessel is "cycling" when put in "normal" mode (heizkring + wasser): I can hear some relais clicking, lufter starts to turn, the ionisation-led goes on for 1 sec, then it shuts down. After this it will try to start again, shutdown again, up, down, up, down, ...
It will go on like this forever.
The only way to get it up and running is to put in in mode "T2" (full power, "vollast") or in "heizwasser-only" mode (where it also gives full power).

When I put it in T2, it displays errorcodes "FE", but I don't know if those codes have been inthere already for a long time or are related to this problem.
I have measured ionisationcurrent, which is about 4 microamps on average. Strange thing is, on full power (T2 oder heizwasser-only) the ionosationcurrent is also lower than 5 micoamps.
Since the problem is occurring I can smell a strange odor, seems like rauchgas?
But to eliminate possible "rauchgas-recirculation" I run the vitodens without covers, so it just takes air from the immediate environment, and the problem keeps occuring?
hilfe bitte. Es ist kalt draussen?

 

[Hausdoc]

If the mixture flap tested before?

 

[philbond07]

If the mixture flap tested before?

The mixture flap? Are you referring to the plastic valve under the lufter which is sucked open to let air in?
This piece seems to work allright.
If you mean the gas-unit, I don't know, I don't touch gas-conducting parts, too tricky.

Tx for replying.

 

[Hausdoc]

No, the mixture Flap is between lufter/gas-unit and burner.
But this must consider only an expert.

 

[philbond07]

No, the mixture Flap is between lufter/gas-unit and burner.
But this must consider only an expert.

Aha ok I see, it must be a separate valve next to gas-valve in gas-unit and lufter, I cannot check this out. It's not on the movie here http://www.youtube.com/watch?v=b0JbHbKh1pk
Is this part serviceable?


Only thing I was thinking of is maybe a partial blocking of rauchgas-pipe, which creates too much resistance in lowpower-modulating mode, but works ok if lufter in fullspeed.
Only thing is I don't know how to easily disassemble the abgass-piping. Directly after the kesselanschlusstuck there is a 90° corner and then 0.5 meter horizontal pipe into a chimney.

I guess I better have it checked out by Viessmann service.
Tx for helping out.

 

[Hausdoc]

leider kann ich kein Englisch (nur ganz wenig)

Dann schreib hald flämisch.

Das Fehlerbild ist, daß im Regelbetrieb das Gebläse anläuft und immer und immer wieder startet ( erst mal ohne Fehlermeldung)

Im manuellen Testbetrieb "springt" der Brenner an.

Ich würde das erst mal auf die Gemischklappe schieben......

 

[philbond07]

Hi all,

Ok, I read something about repairs to the lgm29 platine which burned through some solder due to a 24v-zundtrafo drawing too much current; should be replaced by a 220v-trafo then?: http://www.heizungsforum.de/board/board4-heizungshersteller/board7-viessmann/6561-viessmann-vitodens-feuerungsautomat-lgm29-fehlercode-fe/

In my installation there is still a 24v zundtrafo.
But then why does it start in fullpower-mode?

"Dann würde da immer wieder das Gebläse nur kurz anlaufen": yes that's exactly what happens.



Ein stromungsschalter in brennerraum? Is it a gas oder rauchgas oder wasser stromung schalter?
Do I have to disassemble the brenner or just remove the cover(s) to access?

There is a WATER-pressure switch in the upper-left of the brenner, I tested this already by bridging it, didn't change a thing (hochohmisch unter 1 bar, goes to 0 ohm if pressure ok, so bridging it should eliminate possible malfunctioning), got the ohm-info here: http://kleinanzeigen.ebay.de/anzeigen/s-anzeige/viessmann-wasserdruckschalter-7820384/72603431-87-1757

Ok possible causes of problems till now:
- the mixing flap defect (Hausdoc)
- lgm29, stromungsschalter (rocco-rocco)
- abgas-pipe partially blocked, only letting thru when in manual/fullpower mode
- lufter makes strange noise sometimes, maybe doesnt get up to rpm in regelbetrieb?
- gasmenge teillastschraube?


Here are some movies of the problem which started some 3 weeks ago , in the beginning there where longer starts between interrupts, even started through after a while (I remember back now ;incredible how the cold can disable somebdy's short-term memory )
Today it actually only starts up in full-power mode; in regelbetrieb cycles every 3 sec. or so.

There was also the FE-error displayed at some point (but not anymore now )

- https://vimeo.com/61713964

- https://vimeo.com/61714283

 

[philbond07]

bugger, now it also cycles in full-power mode, game over

 

[Twinby]

We have similar problems with our Vitodens 200. Two Companies already tried to fix it, now Viessmann states, that the main circuit board (Mainboard of tne Vitotronic 200) is broken and must be replaced....

The whole history will come in an own contribution.

Matthias