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E133?

hi i have a potterton promax system HE plus showing E133 i have reset ect but the pressure has gone how do i fix it
trish, August 2022
Lots of possible issues, most of which need a Gas Safe certified engineer.

You could check the condensate drain is running freely.

https://community.screwfix.com/threads/boiler-shows-repeated-error.193800/

tjhtfgjh, August 2022
link Click here to see other fixes for Potterton Promax System HE Plus.