re: water heater fume sensor. I have been painting my basement with a gloss enamel containing ethylene glycol. Have painted over half the basement a section at a time over the last two months with no problem. Painted a section yesterday morning and this morning the sensor tripped. Had hot water last night. Could this have been the paint (delayed reaction over time)? I have more to paint. Would a fan help if the paint is a problem? Would direct the air past and away from the heater.