Immergas EOLO Star 23 kW: Encountering Error 03 After Resolving Error 11, Fan Not Starting

There is no starting capacitor, don't combine just check/replace the relay.

Ordinary short-circuit coil motor, no starting capacitor.
Replace this relay.

Now I will throw in my 3 cents. An Eolo Star 24.3 cooker is working at my family's house. They called in a professional recommended by the cooperative on Friday, based on error 03 he concluded that the board to be replaced. By the way, he slightly devastated the cover of the isolated chamber (not the combustion chamber, just the outer cover, which separates the suction space from the kitchen) and then, aware of the demolition, he left without taking a penny, not even for the journey (long-distance).
By measuring with a meter and Macajew, I invented the cause in the form of a missing passage through the fan relay. I soldered two wires to the underside, which I manually shorted just after the pump started. Here a note of caution - you have to choose the moment of shorting experimentally, too late triggers error 11, too soon can't be either, because either 03 or 11. When I hit it, the furnace started. I heated up the hut, then extinguished the furnace, soldered the relay, cut the top off, cleaned the contacts and soldered it back on. On the third switch-on it caught correctly - this reassured me that it was the culprit. The board has been reassembled, tomorrow I'm replacing all three, apparently they recommend replacing the electrolytes too - I don't know if it's worth it, mine are nice, and you have to be careful with the board, one of the relay pads peeled off the laminate.

A video of the makeshift work:


After soldering, it remains to put the panel together, put on the already patched suction zone housing and the outer housing (this one is fine). What gasket do you recommend, it looks like some ordinary foam gasket, after the actions of the professional there is not much left on the lid.
Question #2: what are the knobs at the top marked "-" (above the tube from the pressure switch tee) and "+" (above the tube to the suction chamber, nothing is connected to it) for.
I wasn't turning, just asking out of curiosity.

Schnaider wrote:

Hello, gentlemen,
On Sunday morning error 03 was displayed and the furnace stopped working.
According to the instructions, a fan error.
I dismantled the fan myself, cleaned and oiled it with WD40, because I could hear that the bearing was seizing up slowly.
Nevertheless, after connecting and switching on the fan, the furnace showed error 03 after 10-15 seconds and the fan stopped working. There was no ignition. The fan ran fast at first, then slightly slower.
Chimney checked, air supply all unobstructed, etc.

SOLUTION:
Immergas installer called the next day.
First action - check fan voltage and diagnosis: unit not firing.
Replacement with a new one (he had with him).
Immediately after the replacement and connection to the power supply, the cooker takes off.
Everything as it should be.
That's it for those looking for help, how the 03 problem was solved in my case.
Just to add that the fan was already 8 years old.

It's been 4.5 years and error 03 has kicked in again.
The fan hot on the coils.
I cooled it down, cleaned it and plugged it back in.
It fired up, but after 10 mins the same thing again.
Later it started to spin again, but eventually gave up.
The blades were going gently on the cooker off. When plugged in, it received a signal (i.e. it was not a motherboard error), but did not start.
There was a short circuit in the fan itself,
It was necessary to replace it again. The previous one served me for 8 years. This one lasted 4.5 years. We will see how long the new one will serve.
With the insertion of the new one, everything started up again, so the 03 error problem was again solved by replacing the fan.