SMEG C92GPX8 issues

[justin adie]

dear hive mind

my sister’s oven has packed up and before she spends her kids’ inheritance on buying a new one, i wanted to have a go at fixing it. It’s a SMEG C92GPX8 with a manufacturing date of Nov 2017.

the symptoms are:

1. cooling fan always on
2. no heat produced on any setting.

• there are no ground shorts on the elements nor other physical components
• I have checked the resistances on each of the three elements (and the two parts of the top element) and they are all within tolerance of the expected value for their wattage.
• the door switch is working and signalling correctly.
• the door lock is gunged up but shouldn’t be a culprit as it is relevant only in pyrolitic heating.
• the thermal cutouts are a bit random and I will change all of them (random in the sense that sometimes they mesure open when they should be closed etc, but when unplugged and tested with a direct heat source each gives firm clicking (and switching from closed to open or vice versa for the normally open one when heated with a match). Bridging the two NC and disconnecting the NA cut out should take them out of consideration but the issues remain.
• the light circuits seem to be fine but I have removed the bulbs and confirm that both circuits now read OL.
• the main oven thermocouple seems to be 1k and the resistance moves when warmed/cooled so I assume that this is ok.
• the heater resistor (for the main fan, I assume) tests within a few {e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of the rating.
• I have replaced the PCB/relay board
• I cannot diagnose the two rotary controllers easily, however both change resistances when different modes/temperatures are selected. If there is more information on what resistance = what mode/temperature I can test this more.
• the oven timer is a bit damaged but this looks cosmetic (to the back plate not the module itself). It clicks reassuringly when switched to manual and the led still does what it should do

I’m at a bit of a loss as to what else I might check – wisdom gratefully received.
thanks in advance
Justin

[electrofix]

ok first of all there are about 6 different models with same model number

off the label i need 2 more numbers. normally in little boxes after the model

you looking in box 1 will say SI then box 2 will be 00 or 01 or 02 etc

Dave

[justin adie]

Si 02 s/n 70711 2782 1

[electrofix]

just to double check we are on the same page

you say cooling fan and we are not taking about the fan in the oven chamber we are talking about the one that blows cold air to keep controls cool

Dave

[justin adie]

electrofix wrote: just to double check we are on the same page

you say cooling fan and we are not taking about the fan in the oven chamber we are talking about the one that blows cold air to keep controls cool

Dave

hi Dave – yes. the cooling fan that sits under the gas plate. the oven fan itself does not come on.

[justin adie]

is there any advice on this issue, please?

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