"I did check the photo eye and it works the way it should".
By what means did you "check" the photo eye?
The way to check it (IF you feel you can do this safely, and at your own risk) is to temporarily bypass the flame safety control so the burner keeps firing and (using an Ohmmeter connected to the photocell leads with them disconnected from the flame control) monitor the cell's response to the flame.
Typically, you should be seeing a pretty steady 100 to 600 Ohms.
If the "eye" is weak or not "seeing" a BRIGHT flame, the resistance will be higher.
If the resistance is high enough (probably in the 1200 to 1500 Ohm range or more), it is NOT enough to keep the flame control "happy" and that's why it's been shutting down.
Sometimes, the eyes fail in the manner of their resistance rising as they warm up, that is why you need to monitor the cell's resistance over some time, and under actual operating conditions.
DON'T leave the heater unattended with the flame safety bypassed, run the test and then put it back as it's supposed to be.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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