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Vitidens 100 W - new unit, no hot water

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TommyD

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Have a recently installed Vitodens 100-W, within the last week, & hot water has been intermittent at best. I'm seeing F.373 - 50 & F. 345 - 50 fault codes. Install follow- up has been unhelpful. I,m also seeing standby temps reach 195 F (91 C) which sounds dangerously high.
 
These are all temperature related, so I would check the flow and return valves are open fully under the boiler, or any other restrictions - eg a filter valve valves. Failing that, then there could be an issue with how it’s been installed such as a blockage, pump failure (yes new ones can fail), another circulation issue.
 

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