Air out the coach completely and reset the detector if new coach fumes are setting off the gas detector.
Replace the battery in a smoke detector if you keep hearing a beeping. This is similar to the gas detector and often overlooked.
Use hair spray outside. Hairspray contains butane which is a gas and gas detectors pick up all types of gas. It is not uncommon for hair spray to set these detectors off.
Charge the battery and increase the level of LP if the detector is turned on but there is no gas.
Turn the detector on and off if the detector will not set. This means that after the detector is turned on and completes its warm-up period, it goes into gas alert mode.