Error code 1

Hi,
R9 is not an error code, but a software revision code.

Here is what you should do.
Take off the front panel underneath the circuit board.
Turn the heater on, if it doesn't Fire and gives no error code you need to look at the back of he circuit board and see what red lights are on. If you find one on there will be letters next to it to point you in the right direction of the issue. Example h1 or h2 would mean high limit 1 or 2.
If you don't have space to look by taking off the front panel only then you would have to take all panels off and get the top loose so you can lift it carefully to access the back of the circuit board.
Once you've done this let me know what you find and I may be able to further assist

Personally, I think the Wii support is giving up. It is outdated technolagy.

The flame detector is dirty. Look for a wire that pokes out into the area where the flame would be. Clean it off.

I am having the exact same problem. Same codes flashing. If you solved it let me know. I had just replaced the thermistor and Stack flu sensor and it was running fine. Previously it would read 126 and not fire, so I changed those 2 items and it ran fine for the last month. When I go out tonight 2/24/22 and the panel is lit up and reading a code. I shut everything off at the circuit. Flip it all back on and it gives all those codes. It will fire and start heating when I switch valves for proper pressure but doesn't let you adjust temp on the panel and just reads a code and won't shut off. Any help in troubleshooting. Thanks.

Replacing the heater CORE ? Drain the cooling system disconnect the heater hoses under the hood at the fire wall then remove the glove box inside the car . then remove the heater box as a whole unit . Take to your work bench now seperate the the unit and remove the heater core.install the new core and reinstall every thing that you took out in reverse order . This is a 5 hour job and if you are not a technician i would not recommend trying this with out buying the work shop manuel for you to follow step by step . You can buy one online at a book store or a parts store . The Chilton manuels are the best in my opinion . Good Luck

2.0 or 3.0 L engine ? DPFE sensor . What code is stored ?

There is maintainence; due to last until 3am on the 10th of March.

When you go to caller ID, move to the number you want to redial. Press *. The 1 will be added at the beginning of the number, then you can just press talk.

I am a free answerer, and I specialize in giving you resources for free
The paid answerers may have a person who knows your product and the error codes
The manual will also have the error codes.
The person who installed the unit will also know the error codes (or should know)
Each day I see 20-25 unanswered questions about tankless water heaters.
The number of questions shows the complexity of the machines, and the inability of the manufactures to take care of their customers.
The manufacturer will refer you to the installer.

http://www.thetankatwaterheaterrescue.com/forums/forum3/

http://www.rheem.com/products/tankless_water_heaters/
The link above goes to Rheem tankless water heaters
Click on a product and it opens a page showing many tankless models
Click 'more information' and another page opens with spec sheets and other pdf
Not surprisingly there are no troubleshooting steps or troubleshooting flowcharts
There are plenty of ways to buy a tankless
There are not many ways a do-it-yourselfer can fix a tankless

I have a propane monitor heater just installed 2 months ago and I get an e 13 code and the heater won't stay on???