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If it is working good on 120 volts it should work fine on LP. Most often failure to cool on gas is attributed to soot buildup in the flue. There is a "twisted metal insert" in the flue that causes better heat transfer. Sadly, the insert also allows soot to build up and restrict flow. Often it can be cleared using an air compressor to blow upward above where the flame would be. Failing that, the flue can be cleared from above with a small brush on a long rod. Try that and see what happens!
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OK, then have a look at the gas jet and the burner... they should be directly in line with each other. If not, they should be. Look for hairline cracks in the galvanized steel box that holds the burner, especially in the corners and around the screws. If that is fine you may want to try to add a cooling fan to the unit.
On the old units they can develop cracks in the box..l.then the heat will escape not efficiently going to the exchanger. I will opt out as you seem to think I do not know what I am doing..thanks