Recently we have had several incidents from our CO/Propane alarm..going off repeatedly at odd hours...in our [near-new] 2018 Casita
Sometimes "reset' worked..last week not. Finally had to get into fuse box at Oh-frikkin-dark-30 and take out the fuse...to shut th dang ting off so we could sleep. No propane
was on. no spray deodorants, no sun screen sprays, no perfume, no rubbing alcohol, no dogs or anybody passing gas near the monitor....ie, nothing from the usual iritations wh make CO/propane alarms go off :-(
Figgered there MUST be a solution bks the TT is only 14 months old and it was in storage from Nov to late March.
Finally found the factory 'manual' and in tiny print
there was an admonition to "vacuum the front of the monitor monthly or weekly in dusty areas"
Did just that, annnnd voila' blessed quiet, tho it alarmed when I re-inserted the fuse. This type crap should be included in factory "orientation" IMHO
BTW Wally World sells a new replacement monitor for $67 US, wh I almost bought b4 finding out about the VACUUMING