Return temp exceeds flow temp when pump switches off

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Vaillant ecoTEC Plus 418 with VRT392f controller.

Why does the return temp exceed the flow temp when the pump switches off?

Does it matter?

Mike

boiler log.PNG
 
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Don't worry about it. That'll be the over run drawing the temp from the HEX once there's no longer any heat entering the HEX the flow temp will drop, it can then be a smidging below the return, as the return temp will stay a little warmer as it's being fed by the slightly warmer system
 

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