Hi, my name is XXXXX XXXXX I have been in the home improvement and repair field for 20 years. I will be glad to help you today. If you turn on two taps on full hot at once, does the water stay hot? Is there any error code on the display?
I am sorry that I do not have an answer for you yet. There will be more questions before I can get an answer for you. I will need information to assess the situation. Do you have a gravity fed system?
I would like to help any way that I can. If there is any further assistance I can provide, I will be here. Is the rating because you had already arranged for a service person and would like a refund?