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My rinnai heater keeps flashing code 12

When my heater tries to maintain the set temperature it shuts down
and flashes code 12

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  • Joshua Sverid
    Joshua Sverid Jan 13, 2009

    for some reason when the heater is on high it will stay on but as soon as it hits room temp it says code 12 and quits    why?

  • Anonymous Jan 21, 2009

    We have the same problem. Heat shuts down and flashes 12, and occasionally shuts down without flashing 12. Normally I can temporarily remedy it by turning off the wall switch that controls power to the Rinnai, and also to the furnace blower, and turn it back on again, basically rebooting it. It is only a temporary fix however.

    Our unit heats our hot water and also a heater coil that is installed in our previous gas forced air furnace duct. The heater coil heats our home.

    One thing I know of is that the system we had installed has its own temperature balancing control. Apparently this conflicts with the standard temperature balancing feature on all the separate faucets and shower. As a result our water temperature is very unstable, especially in winter when the furnace, shower, washing machine, etc. are all demanding hot water. Showers are an adventure...

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4 Suggested Answers

  • 4 Answers

SOURCE: rinnai natural gas log fire heater

12 is a fault code, look in the book if you have if, i think 12 is no or low gas pressure, cheers

Posted on Feb 05, 2009

yalmer
  • 549 Answers

SOURCE: Rinnai monitor heater 1004F

http://www.rinnai.us/Rinnai.aspx/FileLib

hope this helps

Posted on Feb 13, 2008

toyotech
  • 8 Answers

SOURCE: Rinnai Heater - error message "12"

I fix Toyo's which are related to your heating unit. When a Toyo Laser 30 has an error code of 12, it means that the screen in the back is plugged up with lint, dust, or something causing the unit to over heat. A screen with what appears to be a little fuzz can be a significant clogging of the cooling air passive design of the system. Look for a lint screen and try cleaning it! Also, check out any info is the book about screen filters, fan shrouds etc in case your wording is diffrent. Toyo Tech

Posted on May 26, 2008

Therinnaiguy
  • 1420 Answers

SOURCE: rinnai tankless water heater keeps beeping and showing LC

Time to flush it. LC indicates lime scale build-up.

Posted on Nov 28, 2008

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1 Answer

What does the code 12 flashing mean


Flame failure. The stove started and ran for a while then quit. Out of gas, power failure??? Try to restart. IF you get an 11 code then you may be out of gas.

Keep us posted.

Tom

Oct 22, 2010 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

1 Answer

I have a Rinnai 556F Heater and I set it to a specific Temperature and a temperature higher is always flashing. What is wrong?


The temp you are looking at may be an error code. 72 Room sensor, 68 Over heat, 76.80 Room sensor short, etc. What is the exact code??

Tom

Oct 14, 2010 | Rinnai RHFE-556FAIII 21,500 BTU Ductless...

2 Answers

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.

May 13, 2010 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

2 Answers

Do rinnai heaters run efficiently if turned up and down often?


Maintaining the lowest acceptable setting and leaving it at that temperature is the most economical way to run the unit. If the space is going to be unoccupied for an extended time (several hours), lower temperatures are okay. This minimizes the need to burst the heat to warm the space quicker. As I understand your unit, it minimizes electrical & gas consumption by basing the need on the temperature difference of actual space temperature and setpoint. The larger the gap, the more power and gas is consumed.
In summary, when the space is occupied, maintain a consistent temperature setting. When the space is unoccupied, maintain a lower setpoint.

Hope this helps. Good Luck. :-)

Feb 15, 2010 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

1 Answer

I get a blinking light with the number 12 flashing on my rinnai heater


With the unit turned off, hold down on the economy button, the up arrow and down arrow all at the same time for three seconds. A number of error codes will start flashing. Copy the numbers down and repost them so we can help you. I suspect a dirty flame rod or poor gas pressure. Can you give us any info on when it fails or does it light when you turn off and back on?

Feb 07, 2010 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

1 Answer

My Laser 30 keeps getting a ee 12 code ans shuts


Ken,

The screen for the circulating fan has lint on it. Remove it from the back top panel and wipe it off. The lint keeps the air from be able to blow over the stove and it overheats.

Good luck,

Tom

Feb 03, 2010 | Rinnai Toyostove Direct Vent Heater: Laser...

1 Answer

Rinnai heater flashes code 12


Bailey,

Next time you try your stove watch the flame. If the flame goes away and then the error code comes on, you have something wrong with the over temp circuit, gas or gas valve, If the code comes on and then the flame goes away you have a flame sensor problem.

Good luck,

Tom Hawkins
hawkins111@gci.net

Mar 13, 2009 | Rinnai Toyostove Direct Vent Heater:...

1 Answer

The heater keeps shutting off , getting a 99 code


Terry,

Remove the flex hose from the flue pipe inside the house. Try to start the stove. If it runs there is a problem with the flue. If it's been very cold look closely at the pipe around the exhaust pipe. That is the air side. There could be frost built up inside the air pipe. If so it will shut off the gas and you can't run the stove.

Tom Hawkins
hawkins111@gci.net

Jan 31, 2009 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

1 Answer

Heater won't start error code 11


I had the same problem and the heater started working after I cleaned both filters, the bigger one that can easily be taken off and the smaller one that needs to be screwed off.

Jun 15, 2008 | Rinnai Heaters

2 Answers

Power reset - Rinnai 1004


the rinnai is like a monitor. just unplug it, wait five min and plug it back in. then radjust your temp set point and it should pick back up. when there is a power outage the led-s flash 88:88

Nov 17, 2007 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

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