Hi i have a rinni convector 516tr heater i put it on it switches off a few seconds later i think it has to do with the timers i have lost the book/

Gas appliance should be serviced by an authorised person only.

https://www.rinnai.com/inquiry/

https://manual-hub.com/manuals/rinnai-convector-404-01-pdf-manual/

Hi.

12 flashes means "Incomplete combustion". The code is prompted when the flame turns off because of a problem.

Check filter, check gas pressure and thermocoupling. Those are the problem that commonly trigger the code 12 error.

Here a manual.

Here Fixya thread on the problem.

rinni convector 404 lights then keeps switching off

Hi try www.goodmanmfg.com

I have had this problem due to the heater 's combustion sensor concluding that all was not well. In my case, the heater had burned up too much of the available oxygen. I didn't notice the lack myself, so it must be very sensitive. I had shut the place up to keep the heat in and eventually it dawned on me to open a door for a minute or so every half hour or so to replenish the oxygen supply.

The situation is worst when the place is very cold as the heater will roar away trying to heat it up as quickly as possible. After I came back for a holiday in winter, I had to set the temperature down to "L" and "Economy" on plus run an electric fan heater for a day to warm the structure to the point where the gas heater could relax and not burn oxygen faster than it could heat the space.

technical by the looks of it! This is how to fix it: 
http://www.paulsupply.com/files/rinnai429docs.pdf

Hi This is happening to us and I called Rinnai... they suggested that if anyone either in our apartment or an ajoining one has painted walls or varnished a floor that the convection heater picks up the smell and the only way to get rid of it is to burn it off by running the heater for several hours in a well ventalated room...

I am going to try it tomorrow.

will let you know

Hi, Here is the link to the manual. I think something like 'thermo coupling' probably means you need a technician! 
http://www.rinnaisales.co.nz/tradesmart/rinnai2/pdfs/installations/153.pdf

I had the same problem. The heater did not work in heating mode. However it was OK in air-conditioning mode. The operation light and the timer light blink twice and then the operation light blinks for 5 times followed by few seconds non blinking, then the cycle repeats again. I have read on the internet that you better unplug the power cord and then plug it again so that the heater re-sets itself. My only problem was that my heater is directly plugged to the power with no visible plug. So I went to the main distribution board and put off the power for about 20 seconds for the whole home. HOORAY!! The heater worked after that.