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Hi all,
I have F&P IW709 that fills the bowl to the brim and then reports Error 39. I assumed it was the fill sensor area. There is no blockage in the air tube and no water in there either. Have tried simulating a fill with another air hose connected and pressurising by mouth, but no go. The washer is five years old and has failed four times, once with the same/similar fault (F&P replaced the control board). Any clues as to a easy (cheap?) fix? We are on the verge of dumping the F&P and moving on, especially considering the number of F&P faults reported here compared to other brands. 🙁Thanks in advance.
– Rob.
Re: IW709 Fills up then Error 39
It is a water level control problem – no change in level detected in time allowed. It’s usually the connecting hose at fault – kinked, trapped, sludged at the bottom. Alternately it will be the level switch itself, which is an integral part of the motor controller board, so the whole thing has to be changed.
If disengaging the level hose, ensure that all water is drained from the tank before re-connecting, false readings will ensue.
The large number of F+P queries in this forum is due to the power of Google – I’m informed that these machines are generally better than most of the stuff available down under 😀
Regards,
Penguin45.Re: IW709 Fills up then Error 39
Well, I think I’ve solved it. I reverse engineered the fill circuit on the main board and replaced a surface mount capacitor, it’s on a test wash cycle now. For those interested in the technical gory details – read on…
The fill circuit consists of a small coil with a ferrite slug pushed up and down by the fill tube air pressure as the water level changes. This coil forms an active part of an oscillator circuit based on a 74C04 IC. Basically the capacitor in this circuit went open. Instead of oscillating, the output was +5V. The problem then became identifying the value of the capacitor, it was an SMD part with no markings.
I assumed most of the other SMD caps scattered around the board were most likely 0.1uF decoupling capacitors, this one was a little larger so I chose a 0.22uf and it seems to have done the trick! ( 😯 ).
Wash cycle is finishing up now, and so am I (it’s 11.30pm local time).I kept the controller board from the original job three years ago and the fault is identical, the same capacitor is stuffed. It’s going to be fixed and piut back into my spare parts ‘stock’. I won’t even tell you what F&P diswasher parts I have stashed away for our dishdrawer!
– Rob. (Hoping that posting this doesn’t invoke Murphy and his law!!) 😉
Re: IW709 Fills up then Error 39
Actually, mucking around with the older controller board has shown that the capacitor is only there for decoupling. The circuit clock speed is around 78kHz and reduces in frequency as the bowl fills.
BTW they were tested on the bench by just applying +5V to the board.
Both control boards now work after removing the offending little bugger(s) and replacintg them with 0.1uF caps.
There must be quite a few of this particular controller with these possible faults on them out there, if I got two. 🙄
– Rob.
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