Smeg A42 ovens overheating

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  • April 22, 2020 at 3:07 pm #97519
    rafal50
    Participant

    Hi, I have Smeg A42 oven (15 years old). Both ovens are overheating. The top one is getting to 240-250C on 180C setting. After a while it switches itself off until cold again. Bottom one is similar. Are thermostats faulty?
    TIA
    Rafal

    April 22, 2020 at 3:31 pm #468168
    electrofix
    Moderator

    sounds like it
    have you tried setting them at a lower setting say 80 degrees and measure the temp

    Dave

    April 22, 2020 at 7:47 pm #468169
    kaibart
    Moderator

    Is the cooling fan running odd for 2 thermostats to go

    April 22, 2020 at 8:45 pm #468170
    rafal50
    Participant

    electrofix wrote:sounds like it
    have you tried setting them at a lower setting say 80 degrees and measure the temp

    Dave

    Thank you Dave

    Just checked and on 80C setting it runs about 100C.
    Checked again at 180C and this time it held it correctly. Same at 230 setting
    It looks a bit erratic as it went 60 deg over previously

    April 22, 2020 at 8:48 pm #468171
    rafal50
    Participant

    kaibart wrote:Is the cooling fan running odd for 2 thermostats to go

    Thank you kaibart

    Sorry not sure what you mean by “cooling fan running odd for 2 thermostats to go”
    Do you mean the tangential fan at the back?

    April 22, 2020 at 8:49 pm #468172
    kaibart
    Moderator

    Yes I do 2 thermostat at the same time is very unusual

    April 22, 2020 at 8:54 pm #468173
    kaibart
    Moderator

    rafal50 wrote:

    Thank you Dave

    Just checked and on 80C setting it runs about 100C.
    Checked again at 180C and this time it held it correctly. Same at 230 setting
    It looks a bit erratic as it went 60 deg over previously

    From what you are saying it does some like the tangential fan is sticking

    April 23, 2020 at 11:42 am #468174
    rafal50
    Participant

    kaibart wrote:

    From what you are saying it does some like the tangential fan is sticking

    Thank you kaibart
    The fan runs freely and quietly, just tested it by bypassing fan control thermostat.
    Can the fan control thermostat be failing ( it’s just an on/off thermal switch) ?
    Also if I wanted to replace both oven thermostats (erratic temperature control) can I do it without removing the gas hob?
    tia

    April 23, 2020 at 6:25 pm #468175
    kaibart
    Moderator

    There us a possibility of the toc terminal switch as u call it failing these I change alot the other thing to check is there is a big multiplug with about 16 wires in the back right hand corner check none of these have burnt out this is common too.
    regarding thermostats they can be changed I can go through a step by step guide to access them if needs be

    April 23, 2020 at 8:11 pm #468176
    rafal50
    Participant

    Thank you very much kaibart!
    I will change the fan thermostat and check the plug first.

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