Is my Propane system clogged?

[Espee]

Issue:

Furnace flutter and large puff sound (with excessive spark ignition process), when furnace runs at same time as the water heater.

Notice significant increase in water heater burner performance at moment furnace shuts down... leading me to think there is insufficient gas volume?

Furnace still seems to have some degree of fluttering even when running on its own... (and kids want heat)

Now on third Marshall change over valve for the dual propane tank system.
Suburban model SF30F according to owner papers, but see no labeling on unit.
Only basic tools on board as camping out in the boonies...

Happy Holidays

[parkmanaa]

Don't think you have to worry about having butane in the tanks;
to my knowledge butane is not sold in bulk anywhere in the USA any more.
Are your propane tanks new and not properly purged?
Have you tried different tanks and still have the problem?
Definitely sounds like a supply problem.

[pianotuna]

Hi,

How cold is it? Are you sure you have propane and not butane in the supply tanks?