Wall heater shuts off - can it be wind causing back flow
My wall heater keeps shutting off this year. It seems to reset fine with push of reset button in top. Most of the time the pilot is still lit but not always. I think this is due to extreme wind off the great lake I am on. I vent straight up thought the roof. One heating guy thinks it is due to 2nd floor (added this past summer w/in 4-5 feet of vent which does not clear top of it but used to) causing a issue with wind backflow. Another heating guys says no it likely needs a new fan and it is intermittent that is why fan runs fine when opened and push reset button. Wind seems more likely to me which means extending pipe past new build OR in pipe vent (better as will look odd going that tall). Other heating guy says he has installed these and usually they vent through the wall not roof so wind it NOT likely issue, as designed to be out a wall. I think the original was not vented through wall as it was towards water near stairs and into wind. But he wants to order me a new fan. HELP any ideas.
How would I know.