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Hi
We’ve had a Baumatic BT2740ss for a number of years. A little while ago we noticed that after using the main over, the cooling fan (well I think its that) would continuously run.
For a while now we’ve been turning the oven off at the mains.
My wife has also noticed that baking cakes in the oven is problematic. To me, this sounds like a problem with a thermostat.
When we use the oven, it does get hot, but clearly something is wrong.
Does this oven have a “cooling fan”? and if so, how can I test whether the thermostat is no longer working?
Thanks
Re: Baumatic BT2740ss continuous cooling fan
It will most probably be a cooling fan that’s running although I don’t have access to info on that machine from here.
There will be a thermostat that regulated the temperature in the oven and also a control thermostat for the cooling fan, if that goes faulty it is common for the cooling fan to run continuously.
If the main thermostat allows the oven to overheat then it should be picked up by that control stat and kick in the cooling fan.
HTH
K.
Re: Baumatic BT2740ss continuous cooling fan
Thanks for the quick response.
We tend to find that when the oven is turned off from hot, a whirring noise (I suppose made by a fan) continues unless we switch the oven off at the mains – I reckon it would continue forever. We have left it going for ages before.
When the oven is switched on from cold, this whirring noise is not audible. but then again, it could be masked by the main oven fan circulating the hot air.
I think my wife has complained that the oven does not get hot enough rather than too hot.
So there are two thermostats? The control stat kicks in if the oven gets too hot causing the cooling fan to turn. So, if the control stat stops working properly, it will attempt to cool the oven (presumably even when it’s not hot enough?).
Presumably this is going to waste a fair bit of energy? The main oven element tries to heat the oven up to the correct temperature however the control stat thinks its too hot and turns on the cooling fan which tries its best to cool the oven down! Damn, I knew I should have replaced this ages ago.
Is there a way to test whether control thermostat is functioning properly? Should it have a certain resistance?
When should the control stat fire? Is it a safety device that should only kick in if something has gone awry with the main thermostat causing the temperature to rise beyond safe levels? Or should it kick in when the oven is switched off to speed up the cooling process and when cool enough, switch itself off?
Thanks for your help.
Baumatic BT2740ss continuous cooling fan
Thermostats are really, really simple things for the most part, they are either open or closed. Most overheat stats that will kick in a cooling fan are normally open and close when a pre-set temperature is reached. The resistance reading will, for the most part, be completely irrelevant. It either makes the circuit or it doesn’t.
Resistance is only remotely relevant where electronic sensors are used, usually the NTC type which is rare in ovens at the best of times and probably a completely alien concept to a Baumatic one.
Energy is the least of your concerns, sorting the issue I would say is far more pressing.
K.
Re: Baumatic BT2740ss continuous cooling fan
Hi you’re absolutely right – thermostats are simple things.
Is there a sure fire way of me confirming that the control stat is at fault?
Thanks
Re: Baumatic BT2740ss continuous cooling fan
I have a multimeter which measures voltage, current and resistance. It also has a continuity setting for testing circuits.
I guess that the control thermostat is normally open circuit until the pre-set temperature is reached at which point it becomes close circuit thereby sending power to the cooling fan? So that’s the opposite for a regular heating thermostat?
Can you elaborate how you would test this please?
Thanks
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