If the propane monitor alarm is sounding, there is a potential gas leak somewhere, the refrigerator, stove, cabin heater or the water heater can be faulty, there can also be a cracked line, a cracked fitting or loose connection.
Take a spray bottle with some dishwasher detergent and look for the source of the leak, spray every inch of every line until you locate it.
There can be another source of gas and that comes from the house batteries gassing off, they can turn the sensor on.
If you are not sure that you can find the leak, call the local gas company or visit your local Fire Department and ask for help, they will be very happy to assist you.
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