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How to fix redring selectronic?

My redri g selectronic shower is constantly reading ot (over temp) I have purged the system and I still keep popping up saying ot even tho the shower had been off for about 2 days
Exercitus tantalum, July 2022
Seems to cover your fault exactly:

https://www.showerdoc.com/redring-selectronic-premiere-shower-standard-model-2010-current-shower-spares/question/ot-fault-194081

Dudhdh, July 2022