i am having a problem with a reznor unit heater. i dont have the model #. 125,000 btus. on me but here goes.
its newly installed last week. the unit tripped flame rollout. when i returned to find problem it would lock out on flame sensed while gas valve is not energized.
there is a lingering flame when the gas valve shuts off for about 10 seconds. this is what the sensor senses.
the unit is vented horizontally about a 4 ft run max.
it does it with the flue conected or not. it does it at any gas pressure.
is the draft inducer motor not alowing enough draft?