Hotpoint FFUL1913 self test result?

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  • December 10, 2019 at 5:23 pm #96863
    self_test_frustration
    Participant

    I have an issue with my Hotpoint FFUL1913 where the control module PSU went bang. I have repaired this myself (poor joint on capacitor) and all seems to work fine. But after a few weeks the fridge section becomes warm and to some extent so does the freezer.

    I have searched for a repair or technical manual with no luck. But I have managed to find a technical manual for a similar model (FF187 / FF200) and found that I can enter the auto test mode in the same way by switching the unit off and holding the super freeze button for a few seconds.

    When the problem occurs and I trigger auto test, it very quickly finds a fault. But as the lights used on my units test are different to the other model it is a bit difficult to interpret. The super freeze light stays on, but +8 and super cool flash. If I assume that +8 is counted at the ‘mains’ light in the other fridge then the error code is F05, which is a motorised baffle problem. But the baffle appears to be moving OK when I pull it out. There again, if I let the unit warm up the problem is not detected in self test.

    Can somebody confirm if I am interpreting the result correctly?

    Thanks!

    December 10, 2019 at 10:17 pm #465102
    electrofix
    Moderator

    well I read that as fault 25 freezer evaporator probe problem

    Dave

    December 12, 2019 at 10:23 pm #465103
    self_test_frustration
    Participant

    Hello Dave,

    Thank you very much for your reply. It made sense given the issues, but I got my multi-meter out and did a bit more checking and have confused myself again.

    First I Identified the correct sensor connection on the control PCB connector block with the help of a hot cup of tea. 🙂 At tea mug temperature thermisor was heading south of 6k ohms. At room temperature 13k ohms. I turned the unit on for around 45 minutes, turned it off and checked again. Measured 74k ohms. Probably not as high a value as it would have been if I left the unit on longer, but it seems to be working. I used the auto test before and after and it repeated the previous result both times. I thought the error was triggered by a short or open circuit thermistor? Or does it check the range on this model? Checked the correct functioning of the voltage divider on the PCB too.

    Should also mention that the freezer air sensor seems fine too. 14k at room temperature and 40k when the freezer had cooled down for a while.

    Would you still recommend replacing the thermistor? If so, can you suggest a suitable part? Same as for the FF187/ FF200??

    Thanks.

    December 12, 2019 at 11:25 pm #465104
    electrofix
    Moderator

    cant recommend anything all I can say is what the fault code seems to indicate

    bit late now but if I think on tomorrow will see if there are any values for thermistors

    dave

    December 18, 2019 at 1:46 pm #465105
    self_test_frustration
    Participant

    Hello Dave,

    Did you managed to find some thermistor information?

    Thanks.

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