[jsb5717]

Originally Posted by Reece379

Hi, yes propane tanks are full / valves open / stove ignites and burns as should. The furnace burns during the day, but at night when temps drop is when it starts faulting. I'm beginning to wonder if it is a regulator problem, but furnace is the only thing affected with the cold temps. Stove still burns as should no matter time/temp.

Without the correct testing equipment it's difficult to diagnose the regulator. We had the same problem and eventually just replaced our regulator which solved our problem. It is possible to have the furnace falter while the other gas appliances work just fine. That's because the furnace's demand for propane requires that the regulator operate at it's maximum flow setting. The other appliances don't require the same propane pressure and can still work fine. If your regulator is weakening then that could be the case.

I'm not confirming that your regulator is the problem...but it is a possibility.