There are 3 possible causes:
1) a fan is malfunctioning or acting up;
2) a temp sensor is malfunctioning;
3) the projector is really overheating.
If this happens right after turning the projector on, ignore possibility number 3.
In case it’s number 1, take the fans out, tap on them a little and clean them if necessary. Put them back and try the projector. If still not working, you need to find out if one of the fans has a problem.
Situation number 1 is the most common of all.
In case it’s number 2, you can buy replacements from Epson part sellers, such as Gedat, in Germany.
By the way, check if the air filter is clean.
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4,3 x 2,8m semi-blacked out media room | 2010 MacMini > Pioneer VSX-520-K > JVC RS50 (X7) > 107", 1.1 gain, white screen | Planar PD7150