Re: pilot lights but when ignition pops back up the flame...
Will either be the unitrol control box or the thermocouple, when you push down you are holding two magnets together and waiting for a small charge to be created from the probe in the flame , if this is not working you have no charge and the magnets won;t stick to allow the valve to open, change the thermo and see if that works first, its way cheaper than a new controler
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yes you have to get the thermo couple hot in order to get the gas valve to open to ignite the main flame You are probably trying to light the main flame and not the pilot light Hold the pilot light button down and put flame to the pilot light opening You need to be very careful depending on the type of flame you are using to light with the thermocouple could get hot enough to open the main burner flame and it will ignite
I suggest replacing the igniter rather than doing the above step
Unfortunately, Rinnai only sells repair parts through their authorized dealers. Contact the dealer you purchased it from. If you are not the original owner of the home/heater, you can go to Rinnai's website and search for a dealer near you. http://www.rinnai.us/direct-vent-wall-furnaces/
Hows the pilot flame looking, is it nice and blue. The pilot flame on some of these units has was called oxygen depletion safeguards. It's to shut the unit down if the oxygen level in the room gets low. In practice it means the pilot light has to be perfect. I always like to recommend getting these units serviced regularily.
Too much gas pressure. Are you sure that this is a LP heater and not a Natural gas heater? Is the regulator you have rated under 1/2 pound pressure? Try to throttle down the shutoff on the tank to see if pilot gets better. If so, you have a pressure issue. Gas you adjust the pilot gas valve?
The trick is that it may take a long time for the flammable portion of the gas to reach the pilot light orifice where the flame lives. This happens a lot when the pilot flame has been out for some time. There won't be a clicking sound as YOU are supposed to provide the flame - it's not like a cooking stove with such conveniences, because the pilot light is only an occasional thing to light it's rare to find an ignition source built in. I'd hate to see you spend good money when all you need to apply here is time and a flame.
I have a Reddyheat IWH16NLTD with this problem. When the heater fan turns on it blows the pilot light slightly up and away from the thermocouple causing the safety valve to close after the ceramic cools down. The manual says that low gas line pressure can cause the flame to rise too far from the thermocouple causing this problem, so either it is a problem with gas pressure, or it is an assembly plant problem.
Check regulator on the unit.
Check pilot unit on the heater
use soapy water to check for leaks if see bubbles turn off main gas supply valve.
always turn off gas supply before any checks or repairs are made
when all else failes call your local gas provider to check heater and gas supply
Possibly A bad thermocoupler. It is the part that looks like a stiff solid copper wire with on end sticking in the flame of the pilot light and is a safety feature if the pilot goes out it starts to cool and the resistance changes back you the module and the module shuts the gas off. I have seen these go intermediately faulty in waterheaters and do just what you described.