Hi,
Are there any Viessmann experts out there who could give us some idea why I cannot change out the weather compensated control unit for the standard one?
We have a Vitodens 200 WB2B with weather compensation which we have had for approx 7 years, its been nothing but trouble - started with the screws holding the plate heat exchanger on loosening themselves and flooding kitchen, flame sensor needs cleaning at least every 6 months or you get F4 errors after cold nights, air release valve leaked, plate heat exchange blocking every couple of years (finally solved that one after realising installer should have put filter on system and adding one), its been the worst purchase we've every made.
However the real pain is the weather compensation, it just doesn't work, regardless of how much you fiddle with the settings. On mild days its OK, on mild sunny days its too hot, on mild windy days its too cold, then the weather turns cold and the house is freezing, fiddle with the settings and its OK until the weather warms up and then house is roasting etc etc. I guess in a new build it would be fine, just not an old Victorian one.
Replacing it isn't an option at the moment and since it was time for its 6 monthly cleaning of the flame sensor I decided enough was enough and dug out the original standard programming unit that the installer removed when he fitted the boiler. I installed a room thermostat, removed the weather compensation programmer from the front panel and put the standard one on.
When the boiler starts up it faults with a b1 error, internal communication fault. The programmer appears to be working, I can set heating programs, go through coding 1 and 2 to change things etc but cannot get rid of the fault. If I pop the programmer off and put the weather compensation one back everything is fine.
Does this mean the boiler is somehow coded to only work in weather compensated mode or have a missed a setting somewhere that needs changing as well?
Any advice would be much appreciated!
Andy
Are there any Viessmann experts out there who could give us some idea why I cannot change out the weather compensated control unit for the standard one?
We have a Vitodens 200 WB2B with weather compensation which we have had for approx 7 years, its been nothing but trouble - started with the screws holding the plate heat exchanger on loosening themselves and flooding kitchen, flame sensor needs cleaning at least every 6 months or you get F4 errors after cold nights, air release valve leaked, plate heat exchange blocking every couple of years (finally solved that one after realising installer should have put filter on system and adding one), its been the worst purchase we've every made.
However the real pain is the weather compensation, it just doesn't work, regardless of how much you fiddle with the settings. On mild days its OK, on mild sunny days its too hot, on mild windy days its too cold, then the weather turns cold and the house is freezing, fiddle with the settings and its OK until the weather warms up and then house is roasting etc etc. I guess in a new build it would be fine, just not an old Victorian one.
Replacing it isn't an option at the moment and since it was time for its 6 monthly cleaning of the flame sensor I decided enough was enough and dug out the original standard programming unit that the installer removed when he fitted the boiler. I installed a room thermostat, removed the weather compensation programmer from the front panel and put the standard one on.
When the boiler starts up it faults with a b1 error, internal communication fault. The programmer appears to be working, I can set heating programs, go through coding 1 and 2 to change things etc but cannot get rid of the fault. If I pop the programmer off and put the weather compensation one back everything is fine.
Does this mean the boiler is somehow coded to only work in weather compensated mode or have a missed a setting somewhere that needs changing as well?
Any advice would be much appreciated!
Andy