Hotpoint FF91 Mistral Fridge/Freezer

[ipoole]

Hi There
My first post on here. I`ve been called out to a Hotpoint Frost Free FF91. Everything appears to work OK apart from the fact that the fridge thermistor doesn`t appear to sense the fridge temperature, hence the compressor keeps running and eventually the evaporator ices up resulting in the temperature in the fridge rising. I`ve changed the thermistor but it didn`t cure the problem. Any ideas?

[Simon46]

Re: Hotpoint FF91 Mistral Fridge/Freezer

Is the fan running in the freezer? Also does the light go out when fridge door is closed?

[ipoole]

Re: Hotpoint FF91 Mistral Fridge/Freezer

Yep, the fan is running, the light goes out when the door is shut, it`s just that whatever the temperature in the fridge the display reads 19oC, and eventually the temp does rise to 19

[Ray9500]

Re: Hotpoint FF91 Mistral Fridge/Freezer

I’ve found that replacing both the thermistors in the freezer cures a multitude of sins 😉

Ray

[roly16]

Re: Hotpoint FF91 Mistral Fridge/Freezer

Have you checked continuity across the fridge thermistor from the pcb itself to ensure there’s good contact at the edge connector? Geoff

[clyde]

Re: Hotpoint FF91 Mistral Fridge/Freezer

The evaporator thermisor is most likely at fault part no 2601683. It doesn’t like moisture can provide dodgy readings!

if you do a resistance check of the thermistor the approx readings should be

+20’C 3K ohms
0’C 9K ohms
-5’C 11K ohms
-20’C 26 K ohms

Hope this helps

Clyde

[ipoole]

Re: Hotpoint FF91 Mistral Fridge/Freezer

Thanks for your help everyone. I going to also replace the thermistors in the freezer. I`ll let you know the result next week

ipoole

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