There are TWO types of photo cells. You may have the wrong one. this happens when the original fails, then the owner replaces it with the wrong one. They look the same, but have different resistance values and different ranges of resistance.
I learned this the hard way. I had a heater that would do just as you described - run for a bit then shut off. The circuitry is calibrated for the photo cell that the unit is designed for.
Here is how it works. The photo cell is used as a shunt to draw current away from a heater type circuit breaker. When the photo cell "sees" the flame, its resistance drops and draws current away from the circuit breaker. This prevents the circuit breaker from heating up enough to trip. If the photo cell does not "see" the flame, resistance stays high and more current passes through the circuit breaker. This causes it to heat up to the point of tripping and shutting off the heater.
The fact that the heater starts and runs for a bit proves that the circuits on the board are working as designed.
Some things to look for:
Make sure that the photo cell is clean and has a good view of the flame. Make sure that the flame is not diverted by something as simple as a partially clogged nozzle that could cause the flame to be too far away from the photo cell. Check to see if there is a window of some sort between the photo cell and the flame chamber. Check to see if there is another possible place to mount the photo cell. Check to see if the rest of the heater is drawing more current than it should. A motor going bad and taking too much current can make the circuit breaker heat up and trip. Make sure that you have the correct photo cell for your heater.
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