i been to these were the fan runs for 2 mins and dies, then restarts 3 mins later, it was the fan windings. replaced fan. fixed.
not excactly saying thats the fualt on yours, but mentioning 240 to fan,not rotating.plus it running for short time, and no over heating,pump,tank ,rads bled.
the fan is a strong possibility.
obsolete parts now. hard to find. fleebay maybe.
get r.g.i out to fit,for your safety.