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Here is a link to the manual for the 1004 FTR that has the timer. Hope this is right one for you. Re-post with your exact model if this doesn't help. I check in most days and can help with links to most manuals
rinnai has a technical bulletin out on this condition #28. It instructs the technician to adjust the gas pressure. You can get a copy of this bulletin by contacting rinnai at 800-621-9419 (US). or at rinnai.us
This unit can be vented through the roof but requires a specialized flue system-do not use an existing flue connection. Call a contractor - have them check and see if the unit can be modified to a vertical flue- it will require the existing piping to be replaced--Not a job for a do-it yourselfer
The fitting on the back of the unit is 1/2" MPT. Wouldn't suggest messing with it if you are not familiar with propane or natural gas. Make sure the unit is set up for LP if you are going to use a portable supply tank. These units are very reliable. Check all fittings with a diluted soap and water solution before turning on the unit. If it is not connected to it's venting system, you would have a forced induction source of ignition if you had a leak in your piping. These units should only be installed by a licensed plumber or gas fitter, one simple error could allow carbon monoxide (CO) into your house
Is there a chance there is a draft around the room temp probe? It is down low on the right side of the heater. If there is a draft the room sensor is fooled and keeps running the unit. You should be able to prove the room sensor by putting your hand over it after the stove has been running for a while. This should shut the stove down. If not there is a problem with the room sensor.