Baumatic BT904 ss double oven not getting up to heat

Re: Baumatic BT904 ss double oven not getting up to heat

Hi Dave,

I just checked in the oven and there is no additional visible element on the base (just a grill element on the roof) which stays cool. When I turn the oven on there is heat coming through the slots at the back which suggests that the fan/heater is working. Doesn’t seem all that hot to me though – rather more like a fan heater. But nonetheless there is heat there.

I ran a test at lunchtime, and to get the temp up to 220 I set the thermostat at max 230 as we have had to do recently. It got there but it took 20 minutes. so it is sort of working – but not as it should be. Won’t do for the turkey!

Maybe I am wrong to assume that the swapped thermostat controls proves they are ok. As the cooker is now nearly seven years old might they both have deteriorated through heat etc? I have noticed for a while that the associated LED flickers slightly sometimes when it should be off (that might be a red herring as they both have always seemed a bit hit & miss). The thermostat control is 1 9746 T150. I didn’t open one up – are there some contacts inside which can be cleaned up? It looks as though it should be a cheap item to replace. It’s all a bit of a puzzle but I can’t believe there isn’t a simple answer!.

Re: Baumatic BT904 ss double oven not getting up to heat

I have now removed the back lower panel but have stopped short of taking the base metalwork off (ie folded sheet metal attched to underside of oven floor to create a rigid base support and a one inch gap where insulation is located) as I can see into the gap from the rear. There is insulation – but no heating element.

I have the booklet “Baumatic – operating and installation instructions for double ovens” and this has six alternative wiring diagrams in the back. I reckon mine is the “4+Ov + 4+Os” whatever all that means. This shows
1=top res
3=circular res
4=half oven top res
5=half oven bottom res
But there is no 2=bottom res on this model. If there was I assume I should see the connectors at the back similar to those for 5? The only other model of the six which does not show a no2 res is the 4+Ov+grillRE.
A further puzzle: in the back of the booklet it only lists
Main oven fan element 2.3kW
Main oven grill element 2.0kW
Total rated load 4.3 kW
However for the top oven it lists upper 0.9kW/lower 1.3kW/and grill 2.0kW elements.

Does the grill element in the top of the main oven also contribute to the heat generated? On the wiring diagram I think I can see that one switching option is 1&3 running in series. If that is so and the grill has failed (and unfortunately I haven’t checked that yet) half the heat input would be lost – which would seem about right. I would appreciate your thoughts!

Alan

Re: Baumatic BT904 ss double oven not getting up to heat

Have now checked the main oven grill element and it works fine. But remains cool when the main oven (circular)element is on – so much for that theory! Trouble is I am not sure where to go from here.

The circular element was fitted early this year, so nearly new and has been working fine. I presume if it is delivering heat it must be 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} ok

I assume the thermostatic probes also either work – or don’t so are probably nothing to do with the situation.

The control selectors seem ok. There doesn’t seem a lot of protection for the internal contacts but they all seem to be working fine.

What about the thermostat control? Do these get sluggish over time with the heat/fumes? Could it be that it is just not calling up enough heat?Might it be worth getting a new one to try?

As I said before this is very frustrating as everything seems to be working – but it still ain’t cooking right!

Re: Baumatic BT904 ss double oven not getting up to heat

Seals and door fit are fine – no leaks.

Just out of interest I called Baumatic UK to make a “technical enquiry” in the hope that as they would be intimately familiar with their own products they might know straight away of any model faults. Nope, complete mystery to them!

A new thermostat control would apparently cost around £50 – bit steep but not unexpected. I think that must surely be the culprit but it is beginning to not make economic sense – and Christmas looms.

So I guess its time to go shopping……

Cheers Dave and thanks for perservering,

Alan

Re: Baumatic BT904 ss double oven not getting up to heat

Hi Bryan,

Well the oven fan seems to be batting round ok as far as I can tell, and it seems free running enough but I don’t have any means of checking it. The cooling fan on the motor side did look a bit furred up and if I had fixed things I would give it a good clean. If the motor was running slow then I presume the fan oven element would get a bit too hot and there might be a thermal overload device to then cut the power. If there is then that might be a possibility. Is there any known history of these motors going wonky?

No it is not related to fitting the new element: that was last January and this problem has come on slowly over the past month.

Grateful for any comments/advice as I feel I am shortly going to be seperated from around £400+ Not too welcome at this time of the year!

Cheers,

Alan

Re: Baumatic BT904 ss double oven not getting up to heat

Hi Bryan & Dave,

Hope you both enjoyed Christmas!

Well I removed the motor/fan as I said, and cleaned everything up, lubricated bearings etc (no radial play – only some axial float so seemed fine). However I can’t say that I can tell much difference (except it sounds a bit quieter due to oil) and the fan motor seems free running and happy.

Turkey was cooked fine in fact the oven works well enough as long as we crank up the thermostat to 15 – 20 degrees above where we want it and it does get there eventually (confirmed by the little seperate oven thermometer).

So to recap we have an oven where everything works, but not quite enough heat is being delivered. Doesn’t this lead to the conclusion that the thermostat must be root of the problem? I don’t know if they can be re-calibrated, but I suspect it would not be worth the messing about and better to just replace it. What do you reckon folks?

I suspect I will also be encouraged to look at possible new ovens especially with the sales being on!

Cheers,

Alan