If the gas stove was left open for hours, but the LPG tank is closed, the immediate concern is whether there is any residual gas or lingering fumes in the immediate area. Here's what you should do to ensure safety:
Do not ignite the gas stove: Under no circumstances should you attempt to light or use the gas stove if it has been left open for hours. Even if the LPG tank is closed, there may still be some gas or fumes present around the stove.
Ventilate the area: Open all windows and doors to allow fresh air to circulate and disperse any remaining gas or fumes. This will help reduce the concentration of gas and improve the air quality in the space.
Do not use any open flames or electrical appliances: Avoid using any open flames, matches, lighters, or electrical appliances until you have ventilated the area thoroughly.
Check for gas leaks: Once the area is properly ventilated, you can perform a gas leak check. Mix a solution of soapy water and apply it to the gas stove's connections, hoses, and valves. If you see bubbles forming, it indicates a gas leak, and you should not use the stove until the issue is fixed by a qualified professional.
Seek professional assistance: If you're unsure about the safety or if you detect a gas leak, it is best to contact a qualified gas technician or emergency services to assess the situation and make necessary repairs.
Remember, safety should always be the top priority when dealing with gas appliances. If you're ever in doubt about the safety of using a gas stove or if you suspect a gas leak, err on the side of caution and seek professional assistance.