Basic propane alarm question

The propane alarm may come on if you spray an aerosol can nearby. It will stop right away once you stop spraying. Also the CO detector or the Propane alarm may sound when the furnace is started after sitting without use for a while. If it does, shut off the furnace, open windows and doors and let the inside air out. Leave a window open and start the furnace again. Once this happens once, it should not happen again until after another long non-use of the furnace. This is from dust, etc. burning off and it also gives an odor (but does not smell like propane).

Test your propane detector with a gas cigarette lighter without lighting the flame.