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Smeg integrated double oven Model No DO81CBL-5:
Removed oven doors for periodic cleaning, have done this many times without any issues.
On re-instatement find that the large (lower) oven internal lamp is permanantly on as soon as power is applied with all control switches off.The oven has always had a somewhat peculiar mode of operation in that the large (lower) oven internal lamp illuminates as soon as the small (upper) oven door is opened, the small oven internal lamp being controlled from it’s own switch/thermostat as would normally be expected.
The oven has always operated in this mode from new until this issue occured.
Logically, I assume that there is a “door switch” on the upper (small) oven which by design operates the lower (large) oven internal lamp and this has been disturbed by my door removal/replacement activities.The question being, can anyone advise where the small oven “door switch” is located?
Can’t see anything obvious externally within the door hinge mounting holes, have not yet removed the oven to investigate further.
Any pointers appreciated.This switch goes with your oven but I’m not sure if it controls the light, element, or both – https://shop.ukwhitegoods.co.uk/814490323-smeg-oven-door-microswitch
The metal arm that goes with it suggests to me that it’s operated by the door hinge.Many thanks for the reply, much appreciated.
That confirms there is a door switch, the operating arm may have become dislodged/misaligned during the oven doors removal/replacement operations.
The dual micro switch (2 pole) in the illustration would suggest that it performs two functions.
Have always found it strange that the small oven door controls the large oven internal lamp, however, can live with that.Obviously the oven now needs to be removed for further investigation under the outer covers.
I do have an “exploded” parts diagram but can’t locate the oven door switch on that as yet.as with most exploded diagrams its not always where it should be or if there are 2 of the items they may only show one
the switch will be operated by the tail of the hinge
the switch above is shown on diagram on right side next to lower oven item 36777
Dave
Hi Dave, many thanks for your response.
Yes, can see the switch now on my exploded diagram, same as your snapshot, definately seems to be associated with the large (lower) oven even though strange as it may seem the upper (small) oven door has always controlled the large oven internal lamp!
As soon as I can get a bit of assistance with the oven removal will have a look inside and hopefully work out what’s going on.
At least I now have the general area (lower RH side) to investigate and know that spares are available should they be required.
In the mean time and to keep the oven operational have applied the easy solution of large oven lamp removal as I prefer to keep the unit powered up for the clock display.Will keep the forum posted on the outcome.
Spent most of yesterday working on the oven ref. issues as described.
Not an easy job to gain access under the side panels as the panels form part of the oven support frame.As “electrofix” had warned earlier the large (bottom) oven door micro switch assembly was actually located on the LH side of the oven not the RH side as displayed on the exploded diagram.
The door switches operating “paddle” was found to be completely detached as such could not operate, managed to re-assemble and verify operation from door hinge.
There is no door switch associated with the small (upper) oven so still can’t explain how originally the small oven door controlled the internal illumination lamp in the large oven, beginning to think I imagined this but know that’s not the case!One of the micro’s (3 connections) was verified to operate the large oven internal lamp.
The other micro (2 connections) wired to NO & NC contacts, ie. no connection to the switch common!
Obviously this can never perform any switch function (open or closed) with this wiring permutation?
The large oven internal lamp now operated to expectation from the door open/closed action.However, the issue now is, large (lower) oven won’t switch on any of the heating elements or panel neon indicator lamp.
Have verified operation/checked continuity of the oven function switch, thermostat and the rear mounted over temperature protection stat.
There are 2 other (3 wire connection) stats which are believed to control respective ovens fan operation, have previously successfully replaced on of these to restore normal fan operation on the small oven, don’t believe they are associated with oven element protection/control.Have also tried different wiring permutations of the 2 wire door micro switch, common to NO or NC but no effect on large oven heating elements.
Anyone have access to a wiring diagram or advise where one could be sourced?
I was a maintenance technician in the petro/chemical industry all my working life and feel safe & reasonably competent working on electrical/electronic equipment.Thinking more about this, the way it operates seems rather strange. All glass fronted ovens I’ve owned have a light that comes on as soon as you turn the oven on so you can see what’s cooking inside. Where they have a door switch it usually turns off the fan and elements when opening the door but leaves the light on.
Does the bottom oven now work with the door open, as I’m wondering if it was wired wrongly all along?smeg info is hard to fathom. other manufaturers show diagrams against the model but smeg dont. you have to search through a list of units using name and year to get any idea at all
there is no wire going to the common at all ? was wondering if the commons are linked
you did not remove the wires at all from the switches i assume
Dave
Many thanks “tubafan” for the response, much appreciated.
Q: Does the bottom oven now work with the door open, as I’m wondering if it was wired wrongly all along?
No, elements won’t power up at all on any function switch setting with the stat in demand.
With oven door open or closed still no power to heating elements even with the 2 wire door micro re-wired NO or NC.
Yes, the large (bottom) oven illumination lamp does now work from door (open) switch or from any heat selection on the function switch.
Small (upper) oven illumination lamp operates on oven function switch (any selection) only.
However, I’am fairly convinced that the large oven door switch has been non-functional for some time certainly prior to my door removal/cleaning operations.Dave, thanks for your further support.
Q: You did not remove the wires at all from the switches i assume?
No, I did remove the switch wiring in order to split the pair and reinstate the operating paddle, however, I did photograph and methodically draw a diagram of the connections before removing and I’am 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} positive the connections were re-instated as found.Q: There is no wire going to the common at all ? was wondering if the commons are linked?
No, second micro switch common terminal has no connection!
As stated earlier, did experiment by re-wiring NO & NC (WRT common) but this did nothing in either permutation so returned to as found.From a Google search, Servevast Ltd state they can supply wiring diagrams for Smeg appliances on application, they did supply an exploded parts diagram a few years ago but refused to supply the associated parts listing so somewhat sceptical, have submitted a request today.
On reflection, the only thing I didn’t think to check yesterday was the oven timer contacts?
I’am assuming the timer/programmer works on the large oven only, the manual is not very clear on that?tiffy2 wrote:…
On reflection, the only thing I didn’t think to check yesterday was the oven timer contacts?
I’am assuming the timer/programmer works on the large oven only, the manual is not very clear on that?That could explain the oven not working as many auto ovens need to be reset after power had been lost.
Still doesn’t explain the bizarre wiring though.Pleasantly surprised that smeg-service.co.uk (who I believe are Servevast Limited) responded to my e-mail request within the hour yesterday and provided the wiring diagrams as requested, 2 pdf files of 2 A4 pages each, quite comprehensive.
An initial quick look at the diagrams confirmed that the “second” micro switch on the large oven door should indeed be wired Com/NO and appears to be associated with heating elements interlocking, however, as this connection permutation has already been tried without success and accepting that the large oven heating did work previously even with the original micro switch NO/NC connections believe that there is a later fault which is still active.
The plan now is much more detailed examination of the wiring schematics associated with the large oven heating element control, enlarging, printing & highlight tracing before once again removing the oven for further dynamic checks.
All sorted, very much by reference to the now available schematic/wiring diagram.
Issue was a combination of oven door micro switch wiring and remembering to reset the clock/timer after power on!
The large (lower) oven heating elements are interlocked by the door switch (on neutral side) and obviously by the clock/timer (on live side).All door switch wiring now as per schematic/wiring diagram.
While accepting the the large oven heating elements have worked from new (until present issue) can only state that the large oven internal lamp has never worked in it’s current (correct) mode from new, ie., illuminates when door opened (with oven controls off) or illuminates with door closed when any heating mode is selected, this being as per schematic expectation.
Can only surmise that there has been a mis-wiring issue from new!To be honest, we only ever used the large oven once a year, christmas time!
Again, many thanks to “electrofix” and “tubafan” for the support and assistance offered, much appreciated.
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