Smeg A42 ovens overheating

[rafal50]

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

[electrofix]

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

Dave

[kaibart]

Is the cooling fan running odd for 2 thermostats to go

[rafal50]

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

[rafal50]

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?

[kaibart]

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

[kaibart]

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

[rafal50]

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

[kaibart]

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

[rafal50]

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

[Author]

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