Accidentally turned off the pump while the heater was running, and like a good little machine the heater turned itself off. But now, I can't figure out how to get it started again. I've re-lit the pilot light, but I'm pretty sure I tripped some safety mechanism that I don't know how to re-set. Have been looking everywhere for some kind of reset button. I have a Teledyne Laars XE natural gas heater. Unfortunately, there is no diagram on the door to tell me which component is the safety switch that I probably tripped. I have tried backwashing the filter, but it didn't help. Any ideas?