Discuss Vaillant EcoTec Plus 938 temperamental in heating mode in the USA area at PlumbersForums.net
Well, there is no d.029. After d.028 it goes straight to d.033. Why?
Could it be that the diverter valve gets stuck in DHW mode?
OK, looks like need to talk to our plumber (if I can find him - it was installed 2 years ago)The internal one isn’t rated for external loads it’s only for the boiler when it’s doing it’s thing
Internal bypass is fine, you won't need an external one. That's what it's there for.OK, looks like need to talk to our plumber (if I can find him - it was installed 2 years ago)
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