Damn ! you linked my post 
I think … you will be able to help me more than i can help you 
because i have no material more than a soldering iron, a multimeter and a console to read logs.
The link about my post is finaly about tuya compatible heater BUT 
I have an other heater which not works as a tuya component and 
seems to have a similar MCU as yours.
The post is this one : mc96f6432Q + tywe1s how to read the doc and i finaly see in your log some Header with a similar address 0xFA is this i2c protocol ?
Pressing button on the heater permits me to recover values but i don’t know how to write to the register.
edit:
So reading more your Log it seem to reapeate the 55:AA…as header