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This beast is doing my head in. Cust replaced selector with marginal sucess, nothing heats (base, grill elements, but one fan element worked, yhe 2nd ddoesnt. Anyway i found a dodgy relay on pcb by terminal block. Orded 2 from rs and soldered in and now no heat from any element. Both relays replaced, botth are identical to old ones bar their supercesion no at the end of the code (finder 45.71.7.024.300 replaced by 45.71.7.024.310) so theory shouldnt be a prob but now wondering if cust wired up selector right, anyone got any ideas or wiring diagram? Please!
Re: smeg suk91mfx 90 range twin fan single oven no heat
the relay board is just to stop the current from both elements from going through the stat
there is an input wire which powers the board to operate the relays and the board has a simple capacitor power supply to drop the voltage lower. check the relays you have fitted have a similar coil resistance as if its lower it may be drawing too much current for the simple supply
i assume you have not made a mistake connecting the board but its worth a check
find the input wires to the board and check its feeds a live from the stat
Dave
Re: smeg suk91mfx 90 range twin fan single oven no heat
As far as im aware the relays are meant to be identical, but ill do some checking, with regards to the wiring up of that pcb, its pretty straight forward, 2 red braided insulation feeds from terminal box, one to each relay tag, the out relay tag goes to grill/rhs fan element, and on other relay feeds other fan element and base. Middle feeds i cant remember off hand but i photo’d it before i took themvoff so def back on the way they came off. Still would like to verify cust has. Not mixed up any wires on selector tho
Re: smeg suk91mfx 90 range twin fan single oven no heat
thats the problem when you come into the middle of a job and someone has been playing
i dont know the wiring but reading between the lines there should be a live feed from the stat to activate the board. its neutral could well be coming direct from the mains block
Dave
Re: smeg suk91mfx 90 range twin fan single oven no heat
ok dude will have another check. if any one still has a wiring diagram for the selector id really appreciate it if only so i can discount that from, the equasion. I guess its possible another comp on the pcbb failed, such as the litle inverter type thing ? also heres the specification of the pair of relays i used:
SpecificationsFind alternatives
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Application PCB
Coil Power 0.65W
Coil Resistance 1.6 k?
Coil Voltage 24V dc
Contact Configuration SP-NO
Contact Material Silver Cadmium Oxide
Depth 12.5mm
Height 28.5mm
Isolation Coil To Contact 4kV
Length 40.7mm
Maximum Operating Temperature +125°C
Maximum Switching Current AC 16 A
Maximum Switching Current DC 16 A
Maximum Switching Power AC 750 VA
Maximum Switching Power DC 4 W
Maximum Switching Voltage AC 250V ac
Minimum Operating Temperature -40°C
Mounting Type PCB
Terminal Type Through Hole
and here are specs of the pair of relays that used to be in there…Power / PCB relay with Faston 250,
1 NO 16 A / 250 V AC,
contact pin grid: 5.0 mm
Contact material: AgCdO
Coil: 24 V DC, 0.36 W, 1600 ohms,
relay protection: RT II high temperature (125 ° C) !!!
Type outlet !!! !!!
Succession Type = 457170240310 !!!,EAN: 8012823188393
Re: smeg suk91mfx 90 range twin fan single oven no heat
This is the spares manual, the last 2 pages have wiring diagrams.
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