Cannon Oven taking long time to get hot help please

[happyhero]

Hi I am retired but have electrical knowledge from my old job and I have a Cannon floor standing oven, model C60ETX which is not working properly.

It seems to be taking forever to get to the maximum temperature of 230deg which my wife uses all the time as a keen cook.

Now a bit of history, I think it is about 8 years old but in good condition. It did the same thing in October 2018 so I took the back off and tested everything. I found the element round the oven fan blown and so ordered and fitted new. I also replaced the potentiometer at the same time as it looked cruddy although to be honest I probably jumped the gun having found that to be the cure in the past (it probably didn’t need replacing). I watched the oven fan and found it to be too slow for what I thought it should be like so I took it out and checked to see if I could do anything. I found it to be a bit sticky as if it was a little gunged up so I cleaned it and put my cordless drill on the spindle and spun it while spraying it with degreaser and then cleaning it again after. It was a lot better after this, spinning quite freely. I refitted it and it spun much faster (I could really hear it running fast) I could see that through the glass door. The wife was happy again and everything worked great and fast.

Anyway roll on 4 months and now it’s doing a similar thing so I thought I know what’s wrong, that element has gone again, but it is working fine, I checked the ohms and all seems good with the 2 elements, one around the fan and one on the roof of the oven.
The fan may not be quite as fast, I can’t be sure, my wife thinks it’s still turning as it should but I remember it making more noise and turning faster I thought. It’s still fast enough to be a blur once running full so it’s difficult to be sure either way.

I then thought I’ll get an exploded diagram of the appliance but I cannot find that anywhere so I then thought I’ll check the parts list and see if it has another element. Although not the best way as the parts fit many models but I saw they do a base element so I checked my oven thinking that must have failed but there is no base element on my oven. There are no cables going to the bottom, even discreetly, and it takes major work to open the bottom so I am pretty confident there is no base element on our model.

I cannot believe the potentiometer has gone again as they seem to last quite well, the elements are ok so I’m thinking it could be the fan but is that what happens when the fan slows down that it struggles to reach the high temperature? I mean how would a fan help it increase temperature quickly surely it just circulates the heat evenly?

I know there is still the probe I have not tested but I didn’t find any connections to test for that and I am not sure what reading I would get off it anyway if I saw it. I assume the cable shoots off to the front to the controls area, it’s not testable at the back.

What should I do next? Can anybody guide me what to do next please?

Any help or info appreciated.

[happyhero]

sorry typo above on model number, I have corrected it above too now C60ETX

[electrofix]

try this turn the oven on wait till the fan seems to be at its full speed. then switch off and watch how quick it stops. it should slow down gradually if it seems to stop quickly then the bearings are still tight and this may be part of your problem

also this seem quit a complex setup where on different setting different combinations of elements are used so make sure you are on the correct setting

if the probe was faulty it would never reach the desired temp

Dave

[happyhero]

electrofix wrote:try this turn the oven on wait till the fan seems to be at its full speed. then switch off and watch how quick it stops. it should slow down gradually if it seems to stop quickly then the bearings are still tight and this may be part of your problem

also this seem quit a complex setup where on different setting different combinations of elements are used so make sure you are on the correct setting

if the probe was faulty it would never reach the desired temp

Dave

Cheers Dave so can a slow traveling fan cause the “slow”/”near impossible to reach max” problem?

[electrofix]

possibly it depends where the sensor is. air will be hotter leaving the fan and will not circulate properly

the info on the cooker is not as much as I would like but it seems it may use both elements on some setting to heat quickly. look at the owners manual for more info

Dave

[happyhero]

I wasn’t confident the fan was spinning freely enough so I have taken it off and serviced it again and it spins longer after stopping now and I think goes faster while running but I Googled how long ovens take to heat to full and it seems most do it in 10minutes where as ours is taking 45 minutes to reach 230 degrees (the maximum) so something is very wrong.

Its performing similar to when the fan element failed so it really makes me think there is another element failed but I can see and have tested both the fan element and oven roof element and I cant find any other element. I havent opened the bottome as that is quite awkward to do, implying to me that it is not something you are meant to do and watching online videos shows the base element, if there is one being removed from the back at base level. I can see no wires going to the base but the way this oven is performing I’d say really makes it seem an elemnt has failed.

Is there anyway I can confirm how many elemnts the oven has?

Googling it I cannot find any exploded views nor any wiring diagrams. I’ve even looked up current models that look the same and they dont seem to have any wiring diagrams available either.

Why is it so difficult, at one time you could get exploded diagrams for loads of things. Its like a secret now. One diagram and I would know straight away if there was any other illusive elements.

[electrofix]

drawrings

https://parts.hotpoint.co.uk/index.php

Dave

[happyhero]

Had another thought that may help, the fan element is 1600 watts and the roof top one is 2400 watts making a total of 4 kW in the oven. Does that sound about right or should it be higher indicating there must be another element?

[happyhero]

Brilliant Dave, your amazing finding those drawings, cant believe you found some. Seems to confirm I have found all the elements so what could my fault be do you think?

[kaibart]

There is a base element fitted on this cooker which is fitted in the side of the cooker I look at checking that

[electrofix]

well if the element is on full power all of the time there is not much you can do but if the element is switching of and on till it gets to temp we need to figurd out why

Dave

[happyhero]

Yes I replied too quickly I did spot it eventually, just wasnt expecting the positioning of it, above the oven and connections at the side. I thought I was looking at the grill element at first but it appeared to be shown in a funny position and eventually it all clicked. When I saw a base element listed in the parts I expected to find it in the base of the oven and not on top of the other element in the roof of the oven. Anyway I will investigate this tomorrow hopefully and get back on here. It has to be the culpret.

[happyhero]

Right this is what I found. I really expected to find the hidden element that has its connections on the right side of the appliance to be blown but I tested it and the ohms is correct as is the case with all 3 elements. So I needed another approach, so I decided to run the oven asking for full heat (and apart) which it eventually gets to and no wonder its taking so long, only the 1600w fan element is getting any power. I tested each element between the connections and to earth but the other 2 elements remain unsupplied even after 30 minutes running so its definitely not any staggered start or anything like that.

Only one element is ever working just to be clear here, so the fault has to be something the other 2 elements have in common.

I noticed there is a click about every 3 minutes roughly, this is the case right from a cold oven as it heats and I found this click is the power to the fan element ie the element is fed for 3 minutes and then turned off for 3 minutes and then back on and so on. Maybe it is supposed to do this on this element but I would have thought not if the oven is still relatively cold so is it supposed to click on and off from cold do you know?

Maybe this would work fine as part of the normal running if the other 2 elements were working.

Anyway I then wanted to know where the clicking is coming from, not that this is necessarily the fault, and I saw a spark every time this click is heard (it sounds a bit like a relay coming on and off). The spark came from the circuit board numbered 216 and titled “POWER BOARD MAIN E0. D.F.UI MICRO +STANDB”. Hard to tell but there seems to be a row of what could be little white relays on this board so maybe it is a relay operating.

So any ideas what I should do next?

If it is the power board at fault which is over £100 then I don’t think its worth fixing.

By the way I tried the oven control in every position and tested each element in each position but nothing changed.

Help!

[electrofix]

as far as I am aware the element should be powered all the time during heat up

you cant change the board it has to be programmed and its a hotpoint only job unless you buy all the gear

Dave

[happyhero]

Cheers Dave, so do I assume it is the board then, and therefore I cannot go any further?

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