I have a planar pr5022 projector that keeps turning off every 10 to 15 minutes.

SOURCE: lamp goes out after 10-15 seconds

Recently had a similar issue.
When I took the lamp out (Let it cool for awhile first), there was dust all over one side preventing air from the fans from cooling the lamp, so it shut itself off after getting too hot.

SOURCE: Projector shuts off

try reseting the lamp timer and then replace the lamp if it works

Nicholas Lemarr

• 296 Answers
• Posted on Mar 21, 2011

SOURCE: the lcd projector shuts itself

Overheating.

SOURCE: Our ViewSonic projector was turned on to warm it

have you cleaned out the air filter. Try running in full fan speed operation.
is the unit well ventilated, or in an enclosed space.

SOURCE: Projector posted error, "replace bulb" Projector

Your projector need replacement of lamp unit if you don't want yet you just reset the lamp counter

procedure:
Power on projector
press MENU key
Press right arrow key to select Option
Press down arrow key to select lamp Hours
Press and hold down the ENTER key 5 second (lamp hour counter show red)
press POWER button to turns off the projector
now you power on your projector and no error displaed and no itself turn off after 15 minutes

Testimonial: "This is great news! Unfortunately I have already purchased a new lamp. It's probably good to have a spare on hand."