Ideal isar 35 problems

[Ashc]

Hi, new to here,
I have an isar 35 issue, dhw turned on it heats up then overheat stat kicks in cools down then kicks back in and so on causing intermittent hot water through taps.
plate heat exchanger has been replaced, system is clean and heating works fine, any ideas?
cheers

 

[Dotty]

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