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Error code 52 on a r63lse tankless water heater. Hot water service becomes intermittant water gets hot then cools may or may not restart without turning flow off and then back on. How do you check the Modulating Solenoid Valve? Thank

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Just a first thought on this one. I had a fault on a new unit where dust had got in to the gas supply and completly stuffed up the modulating adjustment. Took me an hour to figure it out and about 3 hours to strip the gas valve down and clear it out. Problem is the Rinnai has a large micron steel gauze on the gas line filter in the bottom of the gas valve and lets small debris through. If you have had any work done on your gas line recently just keep this one in the back of your mind.

The modulating solenoid is the large one on the front of the gas valve, next to the circuit board, the pin connecting it can go either way around.
If you are good with electrics you can check the resistance across the solenoid. UNPLUG THE POWER SUPPLY BEFORE OPENING THE FRONT CASE. Take the white lead plug off the solenoid and put a ohms reading acroos the two terminals. Hopfully you should have a little plastic sleeve attached to the inside of the front panel with a single A4 data sheet. On one side of this should be a list of the test points and what reading to expect. Check this if you have it but as a guide 60-100 ohms is what you are looking for.

As far as what might be wrong my hunch would be either PCB or the valve itself, Rinnai solenoid valves are normally really good so I would go with a PCB if I needed to try something. Dont try adjusting or replacing the gas valve unless you digital gas pressure testing equipment as the settings are crucial to the safe operation of the heater.

Posted on Aug 03, 2010

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Richmond tankless water heater will not clear error code


Why is it always Rheem problems?
Every water heater problem at fixya is Rheem.
And Rheem doesn't post any service manuals, like the other two big manufacturers, AO Smith-American, and Bradford White.

Rheem 2012 manual says if error 13 still displays, then contact installer or service technician. Mo Money buddy.
This is about oxygen sensor, poor combustion, bad venting, inadequate air supply, failed sensors, etc.
Get more fresh air to unit and see if that solves problem. The call service technician, and get out wallet.
Copy following link for Rheem-richmond tankless troubleshoot.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Maintain water heater according to instructions in manual to avoid common error codes. Of course this means you have to service the unit each month, and each year, without guarantee the thing will work correctly.


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

Sep 06, 2012 | Rheem Tankless Hot Water Heater...

1 Answer

I have a Bosch GWH 425 HNO propane Tankless Water Heater which began intermittently exploding when demand for hot water occurs.


Call a qualified service tech immediately.
Gas explosion indicates dirty combustion parts, and gas is not fully igniting when tankless turns on the gas. So gas builds up and then explodes causing serious damage to tankless, and serious risk to homeowner.

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

Aug 14, 2012 | Bosch & Tankless LP Hot Water Heater

1 Answer

Help with error code


Before calling service technician, open following link for Rheem tankless troubleshooting resources including error codes and typical maintenance:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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

Mar 20, 2012 | Rheem Tankless Hot Water Heater...

1 Answer

I have a Rheem rtg-74pvn-2 tankless water heater installed in 03/09. Intermittently the hot water stops when only the hot water tap is on. No error codes appear. Bill W.


Before calling service technician, open following links for resources including Rheem chat and possible manual:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/No-Error-Code.pdf
http://waterheatertimer.org/Crossover.html

Typical tankless manual says to have yearly service which includes checking household plumbing, gas supply, vent and condensation, check sensors for loose wires, clean and inspect burner parts and ignition factors etc.

Aug 04, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

What is an A7 code? Gas hot water heater


Before calling service technician, open following links for Bosch troubleshoot resources:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Error codes are start-point for troubleshoot.
A7 is temperature sensor fault.
This can be bad wiring, corroded wiring, failed sensor, very high temperatures due to other part failure.
Other cause can be water filter clogged, lime and scale inside heat exchanger, faucet aerators clogged, or combination of problems listed.

Each tankless manual across all manufacturers suggest maintenance schedule: clean water filter monthly, delime heat exchanger yearly, and yearly service of burner and other parts by trained service technician which can address cause of most error codes, and might solve some problems before they happen.

If tankless becomes chronic issue, solve problem yourself, same day, for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Jul 31, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

Pilot OK main burner does not flare when hot tap turned on


If you are not getting error code, then problem could be plumbing.
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Many internal and external factors can also cause tankless problems without error code.
Circuit board failure, sensor failure, incoming air, venting, gas flow, water pressure, water flow, or combination of factors.

Open following link for Bosch troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Add a comment with your experience to help others with same-similar problem.

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.

Mar 25, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have error codes "C2"


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

Mar 02, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Rheem tankless propane hot water heater error code C7. Cant get hot water. It keeps shutting off and then once turned back on wont work and gives the C7 code. What does it mean?


Use following link for Rheem tankless troubleshoot: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

I believe error code C7 is same as error code 76

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.

Feb 17, 2011 | Rheem Tankless Hot Water Heater...

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