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Hi - I have a Rinnai Convector 406 gas heater which is 2 years old. Yesterday, it started cutting out with an error code of "12" showing in the display. It can be re-started but only stays on for a few minutes. What is the problem?

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I believe the 12 is the error code for "incomplete combustion". In this case you will want to start with the thermocouple. If you are not handy at these things I would call a service tech. You can find a service person on their website.

http://www.rinnai.us/

Posted on Jun 16, 2008

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OUr Rinnai gas heater convector 516tr keeps on turning itself off and flashes 12 on the light panel. What does that mean and how to fix it? tks


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.

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Error code 12


Three main causes.

Short circuit on the low voltage side of the wiring (12V) This will show as an immeadiate error code 12 befoe the thing even tries to light.

Faulty earth on the low voltage side shows same as above.

A faulty gas regulator or partial blockage of gas supply that allows the unit to fire, but will not maintain sufficient gas supply to keep it alight. This will happen after it has lit, maybe erratically with the occasional error code 11 if you try and re-light immeadiately.

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How old is my Rinnai Convector 516 TR?


2000 is the year of manufacture

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Rinnai 560PTR Heater Converted Propane To Natural Gas No Ingition


I think you will find the thermocouple or thermostat has gone this allows the gas valve to open and is a saftey device to stop the escape of dangerous fumes .. it looks like a long piece of thin copper wire approx 4mm thick and it extends from the main valve into the pilot light flame .. When the ignition is pushed and you hold your finger on it for a while this tells the the valve that the pilot light is lit .. conduction of heat along this pipe then opperates the diaphram in the valve allowing the gas to the burners the pilot light then ignites them .. if the pilot light goes out the unit will nort run ..
My advice to you is that even though you may be conversant with the heater .. they do tend to have all manner of faults occur when left in storage or if shipped ( jostling and bumping ) is to get a trained gas engineer to check it out it may cost a bit .. but a gas escape and the following reprocussions are far more exspensive and costly .. Also You may not be aware that if you do have an incident your house ,insurance may be null and void if no service documents can be raised for the correct servicing of a fixed or mobile gas Convector .. I hope this helps Regards Vortash

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The 417 service manual is dated 2003, so they're no more than 7 years old.  You can download the operation & service manuals here:

www.rinnaisales.co.nz/tradesmart/rinnai2/pdfs/installations/161.pdf
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Rinnai Convector 516TR Heater


Hi, Here is the link to the manual. I think something like 'thermo coupling' probably means you need a technician! 
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1 Answer

Error code 12


Error code 12 is a genaric "Flame Failure" code. I suspect that the flame is not hitting the flame sensor or that the sensor is bad. You will need to get to the sensor located on the far left hand side of the unit. If you have the owners manual, it's part #123. Remove it and clean it off. Make sure it is placed back in the heater properly aligned and all the way in. Then try and light it. If it does not stay lit, it may need to be replaced but check out the burner tray for debris not allowing the flame to travel all the way to the sensor. You will have to remove many parts to get to the burner assembly.

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