[vtech]

Oh, thanks! Yes, that is connector X4 on board A2 and is fused at 2A.

I removed the steam generator, did not look as bad as expected. Cleaned the elements and tested the pump, seems to be working fine. It may need some new high temperature insulation foam on the generator which I am going to order after knowing it will run properly.  I am going to clean the box under the generator as well. After opening a hatch on the side I got a hold of a loose tube along with what may look like a rubber seal, cannot say I know what it does, but will for sure get it back in there.

 

Transformer is working fine, so the the pcb is getting correct input voltage. I will continue to look for bad wire connections, sensors and then measure all outputs on the board and hopefully find a fault that is visible and not located on the board. Will let you know if I find anything interesting.

I ordered the relay and will try to solder it on with a phone cable as you mentioned. Thanks for all the useful information so far.

 

[vtech]

An update so far.

Began removing the relays for proper cleaning and testing. Heat sink compound has been ordered and will be applied as soon as I get it. Both section A and section B on all relays seems to be operating normally. I found datasheet for a similar Crydon relay, stating the control voltage range needed to be 3,5-32VDC and minimum input current (for on state) were 10mA. So I used a 9V battery and a fan for the testing.

After removing the CPU and the I/O board for inspection, I came across a damaged/burned relay on the board behind the CPU. Could this be causing the problem? And if so, would it be possible to get this relay replaced, or do I have to replace the entire board? I have a suspicion this I/O board is not as cheap as I want it to be

 

[vtech]

Yes, key “5” is the button labelled PROG/START. Everything i know so far is from reading the “Training Manual – Diagnostic and troubleshooting – SCC Line/SelfCooking Center – Combi Master” which I found searching the internet. I have checked every connection on every board behind the control panel. Hot air, steam, nothing works. Only the fans.The actual temperature  when starting up is about 20℃/ 68℉ (same as room temperature) After 40-60 minutes of running the temperature is 40℃/104℉. I suppose that is the heat coming from the motor/fans? I can push a 1/2 button for the fans to run slower, thats about it. I will first check the relays, the probe, some more around the boards, wires, steam elements and hopefully get it up and running soon. Thank you all for very detailed answers.

 

[vtech]

Thanks for all the information! Much appreciated! . The serial number is: E21CA98071414.
 I have been an electrician for about 4 years now and I see this project is a bit outside my expertise, but i like it!. I have checked continuity on the heating elements and they seem fine. Checked all wires for damage, found some bad ones but that didn’t fix the problem. Checked all connectors and fuses. When going into diagnostic mode I am supposed to press key “5” and select the time 11:11 in time display at the same time, release key “5” and then pressing it again for function test.  It will not let me select time when pressing “5”. If I hold down the time button on the other hand, everything shuts off and the display changes between the real time and “001” if that means something. When the dry heating and time is set, the timer does not count down and I can’t hear any contactor switching on. No voltage through A1/B2 on relay which goes to the heating element as you foresaw. But there is no voltage differential on the controller that goes to relays when switching on/off heating, could the problem be here? Or would it be possible that all the relays have failed?