Today I arrived on site Tankless HWH Screen Control:Reason for call: Screen control replacement. Zone: DHW tankless HWH. Fault: Screen control replacement. Action: Replaced screen control. Result: Tankless HWH is back up and running. Upon arriving at the property, The client directed me to where the unit is. The client explained that the tankless screen has not been working for two months. I proceeded to verify the unit. I proceeded to disassemble the screen control of the unit. I proceeded to install the new screen control. I concluded with the repair of the unit. I started the unit, monitoring for a few minutes. I ran in hot water in the basement sink. The unit is operating correctly. I showed the customer the result of the repair. The client thanked and was satisfied with this day's visit. The customer was left with hot water and the heating working properly at this time. View visual findings from this job here - https://visionshare.xoi.io/?id=XA-15F7-E229E75674834A52