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That is usually a problem with the intermediate regulator which is usually bright red near the far tank. If that goes bad, it may not allow any LP to pass over to the other side. It can be the hose or even the LP tank if the valve is bad. Change them out to test that theory. A new hose is about $16 or so and that is easier than trying to test one. If neither one of those things fix the problem, then the regulator is defective. That is a 10 PSI regulator. Most places sell them. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
Did that resolve this issue for you? IF not, please get back to me and we can dig deeper on this.