20 Most Recent Rheem RTG-66DVN Direct Vent Natural Gas Questions & Answers


I was having the same problem untill I reallized it was my venting system. Test the water heater with no vent on top. Disconnect the vent pipe from the water heater and try turning on the hot water. the water heater needs a special adapter to vent the direct vent water heater. One other thing you can check is the gas pressure in your home. You have to have between 7 and 8 WC (water Column) for the tankless water heaters. You can call your gas supplier to find out what you have.

Rheem RTG-66DVN... | Answered on Oct 06, 2019


Error 11 is ignition failure, or insufficient gas, or defective sensor, dirty combustion parts.
Do the yearly required maintenance such as cleaning the combustion parts, and error code will probably be solved.
Problem is Rheem does not post service manuals for people to learn how to service their equipment without calling service tech.
Copy following link for Rheem troubleshoot resources
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

The cost of yearly maintenance will easily eat away the expected yearly savings of $100 for typical family of 4.

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

Rheem RTG-66DVN... | Answered on Jan 17, 2018


check gas pressure and burner tube for debris also make sure flame sensor clean or replace make sure when burning flame sensor tube burning

Rheem RTG-66DVN... | Answered on Dec 23, 2017


Troubleshoot and error codes following link:
http://waterheatertimer.org/pdf/RTG-error-codes-3.pdf

Not getting gas, low gas pressure, air in gas line, igniter not aligned with burner, wires disconnected, unit not grounded ...

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

Rheem RTG-66DVN... | Answered on Nov 11, 2017


Water Bypass Valve malfunction. Hot outlet water temperature is above or below set point on Remote Control.
but 99% of the time it is the PCB Board, you will have to contact rheem they may send you a new circuit board.

Rheem RTG-66DVN... | Answered on Nov 11, 2013


Before calling service technician, open following link for error codes, Rheem chat, and possible manual:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf

Error codes are considered start-point for troubleshooting.
Error 11 is 'no ignition'
Without ignition, the burner will not turn on and heat water.

This problem can be caused by low gas pressure, air in gas line, defective tankless parts such as gas solenoid, loose electrical connections, improper electrical grounding, bad igniter, etc.
Problem can also be caused by combination of problems.
Good news is that error code shows 1 code and not multiple error codes that can indicate larger failure including PC board.

Each tankless instruction manual recommends yearly maintenance where technician will clean burner parts, bleed gas line, check gas pressure, check air and venting, etc.
Yearly service covers the cause for most common error codes.

Rheem RTG-66DVN... | Answered on Apr 11, 2013


The OHL is not for sale due to a couple of reasons. If the heat exchanger has a hot spot it will melt the OHL making it useless. The OHL is just a large fuse. Rheem will completely warranty (if within date range) if the OHL or heat exchanger has problems. Bypassing the OHL is very dangerous and could result in a house fire since the appliance is mounted to a wall. I would suggest scrapping the copper heat exchanger for cash. That about all its worth in the condition its in.

Rheem RTG-66DVN... | Answered on Mar 26, 2013


Absolute danger here:

1) Call gas company IMMEDIATELY to check for gas leak that can cause explosion and fire.

2) Call plumber immediately to fix improper combustion or improper vent before toxic combustion by-product kills family.
Gas appliances must vent toxic by-product outside and away from home where the gasses will kill the planet instead of you.

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

Rheem RTG-66DVN... | Answered on Dec 09, 2012


Call Rheem
1-800-432-8373

Open following link for troubleshooting resources, including Rheem chat, possible manual, and general maintenance pdf:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Rheem RTG-66DVN... | Answered on Aug 24, 2011


Before calling service tech, open following links for Rheem troubleshoot resources including rheem chat, error codes, possible maintenance and service manual.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are considered start-point for troubleshooting.
Multiple error codes can mean PC board failure.
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf
http://waterheatertimer.org/pdf/Error-code-13.pdf
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Rheem RTG-66DVN... | Answered on Aug 14, 2011

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