I have a RCE 329A Rinnai ventless heater for my sun room. I tried to lite it and nothing happens, The red lite normally comes on, but I get nothing. I checked the gas supply and found I have a full tank. I checked the 110 volts at the plug in and it is ok...What could be the problem..the gas company can't get to it for a week and I need it for everyday use. Thanks for your help. Regards, George Jones

you don't because gas is not in the DIY domain
the conversion is done by a gas fitter
the correct size jets for the different gas are fitted and the air shrouds adjusted to get the correct burn color

this is all I could find it looks like an earlier model, but it may be helpful. sorry it is such a long link. it's the download link for the manual, hope it helps.
http://www.google.com/url?sa=t&rct=j&q=rinnai+natural+gas+heater+manual+avenger+RCE+670&source=web&cd=3&ved=0CC4QFjAC&url=http%3A%2F%2Fwww.finesgas.com%2Fproduct_extra_files%2FRinnai-RCE-592.pdf&ei=rzZgUMbfKpLI9QTwx4DwCQ&usg=AFQjCNGPoBENsIVWy_-1GG94mowsXBSosg&cad=rja

Check..for gas pressure creep.....2 lb sys....big problem...change to green hat....pig tail line.....rinnai gas valve problem being fixed....

needs a service a clean and check of the ignition secquence. should only have green light for power and red light for Lighting. large screen can be bought from Rinnai part supplies

making one out of 1/4 inch copper might be easier

Hold the lock button down for approximately one second to switch between locked and unlock. If it is locked when you turn it on you will need to do this first

Fumes are bad, stop using it until a technician has checked it out. Get a CO detector!

try interrupting power to reset.if it still doesnt work consult manual for code to flashing light sequence.also make gas supply is on

not sure if this unit has any type of sensor to protect you from carbon monoxide but if it is ventless and operates on gas it may be tripping on sensor any ventless unit must be operated with fresh air for combustion

move thermister probe higher on back of unit