Hi Paul,
i can hear the beeper once i plug the air conditionner, the numeric display is working (once turned on it shows room temperature), and leds are working fine.. otherwise i touched the ic while working and it s not overheating.
Hi Zero999, Before i replaced 2 sensors (E2 and E3 error code), i couldn't turn on the device. Since i changed the sensors (5K sensors, one has copper head, one has a rubber head) i can turn on the device then the fan starts as it should, the numeric display show me the temperature but after that the only reactive button is the ON/OFF from the front panel.. the other ones do nothing, so i do not have the other functionalities : deshumidifier, heater,.... as far as i remember, i could heard clics (coming from the relays i guess?) when switching between modes...
I m going to have a look at the PSU board just in case. i do have 3 relays (JZC 32F) and a big one (Hongfa HF2160).. im going to check them, also there is a cable from the psu board to the ic board with several pins out : GND, +5V, 4WAY, PUMP, L,M,H, HEAT, COMP. (L,M,H for the fan)
i check it again right now