Code 29 on model no. rutgh-950vln, please help with a fix

You have to fix the root cause before you reset it.

https://www.google.com/search?q=Clearflow+Bestway+Pool+Heater.+It+has+an+E6+error+code

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A 29 error code indicates a neutralizer drainage failure. The neutralizer is designed to drain condensate away from the heater. If the neutralizer and/or drain becomes blocked up, the unit will flash the 29 error code to prevent the burner from being flooded.

You can find this site but you can't google the manufacturer site.

If you are not able to resolve a problem please contact us toll free at 800-582-8423 before removing the unit from the wall. Stiebel Eltron is happy to provide technical assistance. In most instances, we can resolve the problem over the phone.

http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Bad circuit board
If unit is older than 5 years, replace tankless with tank-type
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Gene
h

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Gene
h

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The neutralizer has a plastic drainage tube going out of the case at the bottom left corner. You need to remove the valve on that tube to let the water drain out freely.

I had the same problem for my new Rheem.

Open following error-code link in downloadable pdf for your files:
http://waterheatertimer.org/pdf/Paloma-Tankless-Error-Codes.pdf

Error code 11 has to do with ignition/gas/gas pressure/electrical grounding.
This can be caused by internal part failure or combination of internal or external factors.
I suggest reading pdf, and then calling service technician who specializes in your brand.

Open typical manual to review required regular maintenance for tankless on page 29
The word maintenance is used throughout manual, indicating that tankless are a yearly budget nuisance
http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf

Open following link to view fixya questions on 1 model of Rheem tankless
Some older questions have information that is useful, and varied
This will give you cross section of problems that are faced by others with same/similar product as yours.
http://www.fixya.com/tags/rtg_74pvn

All costs are energy.
You can also add simple tank-type water heater that can be turned on when tankless is on the blink.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

The electrical specifications are based on 220 volts. It should be noted that higher voltage will increase power, just as lower voltage will have the reverse effect. The (POWER MODE CONTROL) can be adjusted to compensate allowing the user to increase or decrease water temperature. For best performance adjust temperature at MEDIUM FLOW (approximately 1 GPM) this is the average water flow at any faucet with an aerator.

Remember, that any adjustments made on your unit will take seconds to reach point of use. DO NOT OVER HEAT WATER. Water temperature from 105F to 120F is adequate for all practical purposes MODELS Model Max KW at 220V Volts Max Amps at 220V N-120 11.8KW 220V 54 N-100 10.8KW 220V 49 N-85 8.5KW 220V 38 N-75 7.5KW 220V 34 N-64 6.4KW 220V 29 N-42 4.2KW 220V 19 N-10 3.2KW 110V 29*

the pressure valve usually has it's own hole,....a pressure valve (relief valve) has a probe that needs to be immersed IN the tank,...get that manual from the supplier (their responsibility), this part not being placed properly can be dangerous! so please don't take any chances,......