Question about Rheem RTG-74PVN-2 Natural Gas Pronto Whole House, Natural Gas, Tankless Wat

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Unit wont run and thers no error code - Rheem RTG-74PVN-2 Natural Gas Pronto Whole House, Natural Gas, Tankless Wat

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1 Answer

1) Rheem offers on-line chat, which you rarely see for typical tank-type water heater
http://www.rheem.com/products/tankless_water_heaters/customer_support/
http://www.rheem.com/hrc.aspx

2) Call local service technician, and put that person in your rolodex-wallet for future help.
When technician arrives, ask that person for tips and tricks keeping unit working with regular maintenance.
They will gladly offer yearly service.

3) Read manual several times get accustom to yearly maintenance required for tankless water heaters. Tankless water heaters are maintenance heavy. All costs are energy.

4) Read manual several times and notice word troubleshoot appears many times.
Since tankless are complicated machines, many internal and external factors can affect operation, especially as unit ages.

5) Look at label on unit to identify exact product number. Identify same/similar product at Rheem, and become familiar with Rheem website
http://www.rheem.com/products/tankless_water_heaters/

6) Read other question/answers at fixya about Rheem tankless to become familiar with the tankless era
http://www.fixya.com/tags/rtg_74pvn

7) Install DIY tank-type gas water heater and avoid the whole headache
http://waterheatertimer.org/How-to-install-gas-water-heater.html

8) Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on Mar 16, 2011

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Posted on Jan 02, 2017

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1 Answer

How do I flush this unit


1) Copy following link for steps showing how to run white vinegar through Rheem tanklessx heat exchanger to partially remove scale that coats heat exchanger and reduces unit efficiency and causes error code IL:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#de-lime

2) Tankless are prone to scale inside heat exchanger and require yearly deliming to mitigate effects. Do the required yearly maintenance to avoid common error codes.

3) Expected cost of maintenance and repair is more expensive than estimated $1-8 monthly energy-bill savings from owning tankless.

Dec 31, 2012 | Rheem EcoSense by 7.4 GPM Tankless Water...

Tip

Error Code 90 Solution


Over time after about 5 to 6 years many Noritz heaters tend to display error code 90 and stop working. The unit has to be shut off and back on for it to work again for a short time. Error code 90 is indication of abnormal combustion and can have a few causes, including blockage in the exhaust vent. However the problems lies mostly with the combustion fan. that is the fan that you hear when the unit is running. It is unable to deliver enough air to normal combustion.
Replace the fan and while doing it clean the air pathway with compressed air. In addition remove the ignition and heat senors (all in one assembly, in the middle of the unit) and sand them very slightly with very fine sandpaper (400 or higher) to remove build up on them.
While the fan is being ordered you can at your own risk operate the unit with the cover slightly open (about 2 in.) at the bottom and the unit will run without code 90. It is highly recommended to hire a trained technician for the above work as gas appliances pose a significant danger to human life and property if not installed or maintained properly. This solution is for informational purposes only. Please be safe.
Tankless Water Heater Buying Guide Best Prices on Gas and Electric...

on Jun 23, 2014 | Noritz 8.4 Gallon Residential Tankless...

1 Answer

The hot water just turn cold by it self and wont come back. I have to go to the attic and unplug and then plug back, it will then work. It does this again next time in the shower, midle of the shower,...


Before calling service technician, open following link for troubleshooting resources, including possible manual, and Rheem chat.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Rheem usually asks you to call local service technician.

There are many factors that cause problem you describe: bad PC board, sensor problem, loose wires, crossover in single-handled faucet, lime build-up in heat exchanger, clogged water filter.
The remote control might give you an error code. Error code is a starting point for troubleshoot.
Error code on one unit can have different cause than same error code on different unit.

Read manual for required maintenance.
Tankless require yearly maintenance.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 26, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

3 Answers

Hi, I have a Rheem RTG-74PVN-2 tankless hot water heater. It has run great for about a year, but now shuts off completely after running for approx. 8-10 minutes. I have the water temp set at 130 f. Any...


Remove power source from the unit. If remote control is installed; remove cover and lift the control wires on the terminal...can be accomplished from either end. See if the unit runs longer.
If you're receiving any error codes, especialy code 76; contact RHeem customer support at (800-432-8373) and notify them IF you are getting a code "76" error.

Good luck,
JZ...

Nov 25, 2009 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

2 Answers

Rheem Tankless wh model rtg-74pvn shuts off error code c4 76


Contact Rheem; the Burner control unit has lost comm with the remote...the part is warranteed for up to five years.

Nov 01, 2009 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

2 Answers

Originally was receiving error code 11. Rheem sent me three new flame rods and a new controller board. after cleaning unit and replacing parts, it is getting error code 13 after approx 2 minutes of...


They show code 11 as no ignition on the rheem technical page but they do not show anything for code 13. Does it say what code 13 is on the unit somewhere...maybe inside the cover? Is this a direct vent model? What size gas line do you have going to the unit? Make sure it is not undersized. How is the water flow? Does it flash the code with all the faucets on? It might be a water flow issue. Let me know more info so I can assist you further.

Oct 10, 2009 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

C4 76


76 is a bad connection between the controller and the unit. try unplugging the controller and running it, also check the wiring between the two units. if that is not it. it means that one of the control boards it shot

Jul 18, 2009 | Water Heaters

2 Answers

I am getting error code C7 76 on model RTGG 53DVN


is a connection between your controller and the unit disconnect the controller and see if it runs if not then it could be the PCB board. check your wires for bad connections on the remote as well

Jun 27, 2009 | Rheem Tankless Hot Water Heater...

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