Tefal Pro Express GV8975

[jimmy2022]

we have been trying to get this iron to work, but the problem is that the relay clicks and then the no water sign flashes.
the micro controller is pic16f1933.
all other parts like water pump , boiler, solenoid ect are working.

[stj]

be logical - how does it detect water?

[jimmy2022]

it seems that the 6th pin on the pic chip had 36 ohm resistance to ground, after replacing the chip, the iron started to function again. how did this happen?

[jimmy2022]

hello
there is a similar problem with the same model. is there a way to trick the pic chip into thinking there is water in the iron? since i dont have programming software, what other solution is there?

[jimmy2022]

>be logical - how does it detect water?

this steam generator doesn't have a water sensor.
boiler gets hot
water pump activates
then it switches on a relay which causes the "no water" led to flash even when there is water . i am assuming it is a programming issue.

[CapLeaker]

You replaced the PIC chip? Did you program / flash it too?

[jimmy2022]

tefal doesnt want to share the firmware it used to programme this chip .

[jimmy2022]

I bought a used board of ebay and replaced the pic chip. same problem

[CapLeaker]

If you bought a whole board, why didn't you replace the whole board rather than the chip? I suppose you wanted to know if the chip is the problem?

[jimmy2022]

because the lady wanted 16 quid with the wires and 9 quid without,

[CapLeaker]

because the lady wanted 16 quid with the wires and 9 quid without,

7 bucks extra for wires? WTF is wrong with people?!

[jimmy2022]

managed to trick the pic chip and confirmed that the board is working. the problem is either the ntc in the hand set or the boiler.this means i wasted 9 quid for no reason, there was no problem with the original pic chip.

[CapLeaker]

Does the boiler heat up?

[jimmy2022]

everything works. 5 volt for one of the ntc's was missing.

[CapLeaker]

Ahh! Good find!