Question about Rinnai R53e-NG 5.3 GPM Tankless Water Heater Exterior, 5.3 GPM, Natura

Open Question

Internal water leak combustion chamber - Rinnai R53e-NG 5.3 GPM Tankless Water Heater Exterior, 5.3 GPM, Natura

Posted by Anonymous on


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How to test flammable vapor sensor lockout on whirlpool gas water heatermodel nd50t122-403

You could clog up the screen on bottom of water heater... and this would cause FV system to trip because of overheated combustion chamber... then clean arrestor screen and push reset button located on front of combustion chamber to get water heater working. Of course you might have to replace parts to restore functionality.
Or pour some gasoline nearby and see if the water heater explodes, or if the FV trips. I would think this to be unwise.
Contact Whirlpool


Oct 19, 2014 | Water Heaters

1 Answer

Taknless water heater leaking

If combustion chamber is leaking, then probably cheaper to replace water heater.
Must have correct condensate drain, or acidic water will drip into combustion chamber and eat hole through metal, and then short out electronics.


Nov 26, 2013 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Gas not getting to the combustion chamber of water heater

1) Gas control valve might be bad.

2) Copy following link to identify gas control valve:
3) Link above has general troubleshoot information concerning each gas control.
4) If FV system tripped due to clogged air intake, then can shut down gas control.

Less air means slowed venting, but same amount of gas is still burning, which overheats combustion chamber tripping FV system.
Each brand is different: Some air intakes are located on bottom of heater, while other brands, the air intake is located under combustion chamber.

5) Gas control will also fail if thermostat fails and allows tank temperature to reach beyond ECO set point. The ECO is 1-time-use thermal fuse. Replace gas control.

Dec 06, 2012 | Water Heaters

1 Answer

What should the gas pressure be on pilot?

Copy following link to troubleshoot by type of gas control valve:

Bradford White posts service manuals: Both before and after introduction of ICON (Honeywell) gas control valve

Don't forget to clean air intake locate under combustion parts, using instructions in service manual. Or compressed air. Ample air supply will ensure that combustion chamber does not overheat because of slowed venting of hot combustion by-product that will trip the FV system.
And remove heat trap inserts if water pressure has problem or water heater is humming or whistling

Post question on pro water heater forum:

Nov 28, 2012 | Bradford White MI40T6FSX 40 gallon LP gas...

3 Answers


Sounds like water heater air intake clogged with dust, caused slow venting of combustion gas that overheated combustion chamber and tripped FVIR lockout system.

Copy following link to identify type of gas control valve and download service manual that might apply to your unit.

You need to clean air intake with compressed air or feather duster:
And possibly replace gas control valve, and/or replace thermal cut-off located inside combustion chamber, or on later models, reset thermal cut-off located on front of combustion chamber, or replace FV sensor.

Oct 02, 2012 | Water Heaters

1 Answer

Hot water heater womt light, flammable vapor sensor code

Most likely: Combustion chamber got too hot because air intake is clogged with dust, causing less air to flow upward through vent pipe ... the slowed flow of air caused combustion chamber to overheat.

What brand and model water heater?
Look at label on side of unit and add comment.
Otherwise call service tech to repair/ replace water heater and clean arrestor screen (air intake) and replace or reset parts as needed, depending on model number and brand water heater.

AO Smith, Bradford white, and Rheem are main manufacturers.
Each has slightly different repair protocol, and each gas control valve can also be different. So more information is needed.

Identify gas control valve:
Rheem TRD/ FVIR glass vial
How to remove combustion parts to inspect for Rheem glass vial and clean arrestor screen located under combustion chamber:

Sep 30, 2012 | Audiovox Richmond 6G40-36F 6-Year Tall Gas...

1 Answer

Rheem water heater 42vp40sf and the fvd interface failure code is flashing. how do i fix this?

Call Rheem

TRD is flammable vapor system. Typically there is a glass bulb or fuse located in the combustion chamber.
See example image:

Remove the burner and look for the evidence of broken glass bulb that holds the air intake open.
Air intake is located bottom of combustion chamber, and bulb breaks causing metal plate to snap upwards and close off air supply to combustion chamber.
Rheem will have exact part number and possible instructions. Other people have wedged the air intake open to get system working again, but I do not know if that will work with your model water heater with electronic control. Working around the FV system exposes home and people to flammable vapor ignition and explosion when water heater is exposed to flammable vapors.
Example manual with illustrations.

Clean burner and pilot orifice and combustion chamber while burner parts are removed. Also clean air intake.
When burner is removed for cleaning, the access door gasket might need to be replaced.
Your product manual and/or Rheem will have that part number.

Sep 23, 2011 | Audiovox Richmond 6G40-36F 6-Year Tall Gas...

1 Answer

Automatic restart is not working. Seems to keep saying eco problem...I thinl...the code is four flashes followed by two flashes.

Gas control valve is not identified, so error code is not known.
ECO means energy cut off.
Energy cut off happens when gas control valve thermostat has gone bad, or when gas control senses runaway heating inside combustion chamber.
Newer heaters have resettable ECO for combustion overheat. This reset is typically located on combustion chamber door and is round and has two wires that connect back to gas control. Generally you have to clean combustion chamber and tubes and catch up on maintenance, then reset ECO, then fire up heater again to see if problem is resolved.

Newer heater does not have reset for bad thermostat, and in that case you replace gas control valve thermostat.
Older heater does not have reset, and combustion chamber and parts are cleaned, and gas control valve thermostat is replaced.
Your manual is best place to start troubleshoot.
Open following link to help identify gas control valve:

Jul 10, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

I need to remove the burner to check the safety device. How do I remove the burner?

You need the manual for your specific Rheem product, which shows periodic maintenance steps needed and will sometimes show diagrams.
Open following link, click on same-similar product, when page opens, click tab that says Specs/Docs, download Use and Care manual:

The instructions will probably suggest you call service technician do the work.
After all this is a gas appliance, and not really a first-time learning opportunity. One kaboom is a lot more expensive than watching what the service technician does so you can repeat it later.
If cost of parts and labor is higher than $330, then it might be cheaper to install new gas water heater that you buy from local box store.

As a general non-specific guideline for cleaning burner.
Some water heaters have a gasket-seal where pilot and burner tubes enter combustion chamber. You might need this gasket replacement on hand in case old one breaks.
Other combustion covers have tamper-resistant screws that signal a service technician should do the work.
1) Take photos of all parts and areas so you have a record of how it looked for easy reassembly and relighting.
2) Turn off gas to water heater. The gas valve handle should be perpendicular across the gas line to turn off. The gas valve handle is parallel with gas line when gas is ON.
3) Using wrench, loosen tubes that attach to bottom of gas valve control. Notice tightness of each when loosening. The thermocouple is finger tight plus 1/4 turn. The other fittings are snug to prevent gas leak. Note which fittings have sealant on the threads, and then use yellow teflon tape on those fittings when reassembling. Test gas lines for leaks using liquid detergent mixed with water. Soap bubbles indicate gas leak.
4) Lift burner out of combustion chamber.
5) Clean burner and combustion chamber with wire brush, and you can use mild detergent with a bit of water.
6) Use a burner brush to clean out burner tubes, and use air pressure to help remove particulate. Remember, obstruction as small as a cobweb inside the tube can cause the water heater not to operate.
7) Finish up using vacuum cleaner, reassemble parts, and light water heater using instructions printed on side of tank.
Other helpful information available on following link:

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 13, 2011 | Rheem 40 Gallon FVR NATGAS Low WATER...

2 Answers

Leaking from inside box for few days , plumber said condensation built up to use fan to dry out.

If the water is coming down over the fan motor, you probably have a heat exchanger leak. If the heat exchanger is leaking, it needs to be replaced. The heat exchanger is the large copper box on top of the heater.

Oct 15, 2010 | Noritz Water Heaters

Not finding what you are looking for?
Rinnai R53e-NG 5.3 GPM Tankless Water Heater Exterior, 5.3 GPM, Natura Logo

Related Topics:

26 people viewed this question

Ask a Question

Usually answered in minutes!

Top Rinnai Water Heaters Experts

Donni Steen

Level 3 Expert

659 Answers


Level 1 Expert

13 Answers


Level 3 Expert

744 Answers

Are you a Rinnai Water Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides