TC reported air-con fault at front DT car, unable to reset. Staff(BBT) checked and confirmed front D T both set air-con faulty. Unable to reset. Saloon car warm.TC reported air-con fault at front DT car, unable to reset.  ~~~~~ TC reported air-con fault at front DT ca     Check and found A/C 1-1 & 1-2 LP charging point was icing badly.Check LP-20psi,HP-70psi both unit same.Top up freon and monitoring LP-45psi & HP-102psi contantly.No icing observed cooling ok. Done by Koh.  18/10/22