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Sabre 29 water pressure drop?

sabre 29 water pressure dropped, how to increase the pressure
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how can i fix my viessmann boiler?

i have a viessmann boiler i keep getting a f4 resset flashing on the display can anybody help

mau
March 2009
ViessmannHeating, Home Heating SystemsViessmann Boiler Heating
Which type is it? check the type. WB1A? WB1B? WB2A etc. and please give me the 16 number serialnumber. The info is on a sticker, probably on the top or side of the boiler next to the exhaust.

Maybee i can help.

It has a problem with ionisation. There are very different possible causes.

Please let me know.

Joost
March 2009

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