On arrival unit was not running. Check thermostat And thermostat was set to on. 24 V was coming from R into the board but not distributing anywhere. Bypass board and unit turned on. Diagnosing is bad board. Will look to get price and availability for new board and reach out to customer when found. Customer got £1 of free on ad and signed up for tap senior plan. Collected payment and signature and left. Customer happy.