Well then start at your propane bottles, disconnect them (both bottles) and make sure no obstruction. Re-connect and make sure connection is tight so propane bottle security valve gets open, open both propane tanks very very slowly. Go to your stove and purge propane until it lights. If that doesn't work then probably a faulty regulator.....also can tap regulator gently in case in got stuck when trying to switch over??
Looking at the inside of an OPD equipped propane cylinder valve
OPD Valve Design
The design of the OPD valve is such that turning the cylinder service valve handwheel will not produce any effect if the cylinder is not hooked up to an appliance. In other words, a connection must be made between the appliance hose end and the cylinders service valve. The inside of the OPD valve is engineered to only allow propane in or out if the internal valve is actuated by being depressed. This OPD valve feature adds additional safety in case the handwheel is turned, opening the valve. For this reason, OPD equipped cylinders will not allow gas out of the cylinder when opened. The same is true for industrial forklift cylinders. Click the photo of the OPD valve (left) to see a larger and more detailed picture of the of the internal flow valve.
See additional OPD Valve Information
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