Problem with Column Heater


A few days ago I upgraded separation module ( Waters Alliance 2795 HT ), from 2.03 to 2.05 .Now I set Temperature ( at Standard column heater without switching valve and PCB 270719 ) to 30 ( or ….  ), at the few seconds of start the warm-up ,displays error h/w 3 and shuts off heater.

 I'm waiting for your ideas.

At the end, please advise me which serial cables chiller, degasser and column heater are connected to on the motherboard of which J2 - J3 – J4 – J5 – J7, Because I have seen the connection of these components on main PCB devices 2795, please tell me the correct location of these components on which junction on main PCB.

Yours sincerely

with all respect