Furnace - propane stop/start during its on cycle?

I assume the propane supply is adequate..?

This topic has come up several times in the past. Some responses have recommended checking the ductwork to be sure there are no restrictions.

I am of the opinion that this is normal operation for some RVs and for some furnaces. My burner definitely cycles on and off numerous times when raising the RV temperature by several degrees. This has always been the case and my rig is almost 20 years old. I have never timed the cycles but I think the burner probably runs for 3 or 4 minutes and then blows air for almost that same period of time before the burner starts again.

Burner short cycle..

Ductwork air blockage..

Did you shut or block off any ductwork registers? Blockages or intentionally closed off vents slows the air flow going across the heat exchanger, this increases the temperature until the over temp safety trips the burner off until the temperature drops to a safe level.

Fan running too slow..

Check your battery voltage at the battery and at the furnace. Since the fan motor is DC it runs directly from your battery and when the battery voltage sags, so does the motor speed and the reduces the air flow causing high temperature safety to trip and turn off the burner.

Too much propane pressure..

Regulator malfunction can result in higher propane pressure to the furnace which affects flame size.. Check the burners on your stove, flame should not be excessively high and should be all blue.