Question about Rinnai R75LSi Interior 7.5 GPM Natural Gas 84% Tankless Water Heater

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Error code 71

Have covered everything in service manual, checked all wiring, new gas valve, fan, and flo servo. worked fine for 2 months, now code present again.

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  • Rinnai Master
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Absolute best solution for Tankless water heater is to replace whole thing with tank-type water heater and quit spending money fixing an old computer with multiple sensors that is connected to your water pipes, electric line, and gas line, that is connected to a gas burner with vent pipe to outdoors ... As if each of these systems doesn't have a load of problems on its own without a computer chip.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#install
Otherwise, I do not have a source of information that is better than a service manual.

Posted on Apr 25, 2013

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Posted on Jan 02, 2017

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1 Answer

Vacation mode hot water heater


GE is made by Rheem.
Sounds like water heater is short cycling.
Copy following link to troubleshoot by type of gas control valve, including error codes, and instructions how to replace each type of gas control valve.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
Unforturnately Rheem does not post service manuals, and refers customers to call service technicians... so wonder where these guys get service manual... or maybe they guess at it.
However 2 year old water heater is under warranty. The date of manufacture shows on poduct label serial number. 3rd and 4th digit of serial number are year of manufacture. Parts are covered in second year. Rheem might require plumber to validate single-family residential installation.
In any case other companies post service manuals that cover same gas control valves. These manuals apply to Rheem.
Only difference between Rheem/GE and other brands is type of FV system.
If the air arrestor screen gets clogged (not likely with new heater), the intake air slows down causing vent to slow down. Same amount of gas is still being released and burned, causing combustion chamber to overheat. As a result, the TRD glass vial breaks and air intake trap door springs closed. At this point the gas control valve will usually signal error flashes indicating lockout. Shutdown is usually less problematic to homeowner than allowing too much gas to accumulate inside burner at once, causing risk of explosion. Gas appliance are dangerous without doubt.
Call plumber to check everything might be safest route, especially since low gas pressure is one possible cause of short cycling. And you will be comfortable afterwards knowing who to call and that gas appliance is check out professionally not to have defects that will cause problems down the road.

May 28, 2013 | Water Heaters

1 Answer

Whirlpool 6th sense natural gas water heater 50 gal. Bought brand new today. Upon installation, discover low gas pressure running to unit. Turned out that gas line had under ground leak so had to turn...


1) Be careful before you Call Whirlpool 1-877-817-6750.
Be careful what you report so not to void warranty because installation protocol was not followed. Whirlpool will cover gas control valve, and possibly the installation of valve which takes about 15 minutes and does not require emptying water heater.
************So make sure you report installation that is consistent with installation shown in manual.

2) Whirlpool will also answer this same question later today with invitation to contact them.

3) Copy following link to identify gas control valve, and download service manual:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

4) If dirt or debris gets into gas control valve, it will cause it not to work. Such as broken gas line. Debris can enter gas line.
Or if too much pipe dope was used on gas connection, or stray teflon tape got into line and then into valve, or end of pipe got dirty during installation, and then dirt got into gas control.
Take off gas line and use vacuum cleaner to see if something can be removed by suction. Clean up the joints.

5) It appears you have ordinary Honeywell gas control valve on atmospheric vented water heater with 9 year parts-labor warranty..
Unknown error code, so it is hard to look up solution in service manual.
Add a comment if you want expert to look up error code in service manual.

Feb 13, 2013 | Water Heaters

1 Answer

Rheem-Tankless-water-heater I am showing a C2 then 11 flashing on my thermostate. what is wrong.


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

Error codes are start point for troubleshoot.
C2 11 is 'no ignition' or 'gas shut off vale is not open'
Gas shut off valve handle must sit parallel with gas line.
This kind of error code can be air in gas line, improper grounding at electrical outlet, bad igniter, shorted solenoid, loose connections, etc.
Most tankless manuals recommend yearly service, and that type of work usually covers cause for most common error codes: for example checking gas pressure, gas line, air in gas line, clean and check burner and combustion parts and igniter, inspect that vent condensate is properly draining and vent has good draft, clean water filter, clean air intake, check for loose wires, delime heat exchanger, test outlet with circuit analyzer etc.

Aug 11, 2011 | Water Heaters

1 Answer

It often flashes ea or af and doesnt want to light


Before calling service technician, open following links for troubleshoot resources including common error codes, Bosch contact information, link to service manuals, and possible product manual
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

Call Bosch 800-642-3111
Multiple error codes can mean PC board failure.
AF might be A9, but not sure.
EA is 'no flame ionization detected with water flow'
  1. Verify that all manual gas shut off valves are open.
  2. Check gas type.
  3. Reset error code and open a water tap to cycle the heater in an effort to purge air on new installations. Cycling hot water tap on and off multiple times may be necessary. If heater still faults with EA error code, have a licensed gas technician properly purge air out of the gas line leading to the water heater.
  4. Check three wire connections to ignition group on the lower front of the heat exchanger are secure.
  5. Check gas pressure.
  6. Check venting specifications are met. Improper venting may cause premature failure of the flame sensor rod.
  7. Check that the minimum power fan speed has been adjusted to the proper value.
  8. Observe inside the viewing window of the heat exchanger when a hot water tap is opened. Sparking should be followed by a steady blue flame. If flame is unstable or yellow with proper gas pressure.

Aug 11, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

Bosch GWH 715 ES flashing EA code. This unit was working fine for over a year so I am assuming gas pressure can't be the problem? The spark is flashing and the unit lights for about 2 seconds then...


http://www.digelair.net/pdfs/TECHLIT/BOSCH/MANUALS/Bosch-ProTankless_AM.pdf
http://www.bosch-climate.us/files/201009031238250.GWH715ES_English_12.2008.pdf

Above are the manuals required to diagnose and service your error code.

EA: No flame ionization detected with water flow.
Verify that all manual gas shut off valves are open. Check gas type. Reset error code and open a water tap to cycle the heater in an effort to purge air on new installations. Cycling hot water tap on and off multiple times may be necessary. If heater still faults with EA error code, have a licensed gas technician properly purge air out of the gas line leading to the water heater. Check three wire connections to ignition group on the lower front of the heat exchanger are secure. Check gas pressure. Check venting specifications are met. Improper venting may cause premature failure of the flame sensor rod. Check that the minimum power fan speed has been adjusted to the proper value. Observe inside the viewing window of the heat exchanger when a hot water tap is opened. Sparking should be followed by a steady blue flame. If flame is unstable or yellow with proper gas pressure.

Jul 07, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

No hot water. Constant beeping at the tank. Tempature gauge flashing 11.


Before calling service technician, open following links for Rheem troubleshoot resources including Rheem chat and typical service manual and typical product manual.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are start place for troubleshooting:
Error 11 is 'gas is inadequate' or 'ignition failure'
Open gas valve so handle is parallel with gas line.
Bleed air from gas lines.
Check that appliance is grounded.
Check igniter wires and harness for damage.
Check that vertical vent length does not exceed limit.
Other causes: Gas inlet solenoid valve, bad igniter, solenoid valve, flame rod.

Jun 14, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Error code e2. inlet water temp sensor. any one have to fix this?


Before calling service technician, open following link for Bosch troubleshooting resources, including error codes, manual, Bosch contact info, and service bulletins.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Error codes are starting point for troubleshoot.
e2 is cold water temperature sensor fault.
Bosch error code says: 1) Check connector on wires coming from top of water valve for a secure connection.
2) Sensor may trip if water temperature drops below freezing to protect heater from freezing conditions Any damage due to freezing conditions is not covered under warranty.

Another contributing cause can be temperature thermostat set very high and tankless sensor is going bad, and very cold incoming water, or combination of factors above.

Also read manual for advisories and required maintenance. Some units require water filter be cleaned monthly.

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 28, 2011 | Bosch AquaStar 2400ES-NG

4 Answers

C2 11 code


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

Error code C2 11 is 'no ignition'
Ensure you have gas to the appliance.
Ensure gas type and pressure are correct.
Bleed all air from gas lines.
Ensure gas line, meter, and regulator are sized properly.
Ensure appliance is properly grounded.
Check gas solenoid valves for open or short circuits.
Ensure igniter is operational.
Check igniter wiring harness for damage.

There is no service bulletin covering how to perform these actions.
Rheem will ask that you call qualified service technician, who can give you tips and tricks for keeping the unit working, including opportunity for yearly service that will eliminate the expected $1-8 monthly savings from owning tankless.
Read manual for yearly maintenance needed to keep unit working at prime efficiency.

Apr 18, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

RTG 74-PVN-2 Rheem tankless water heater. Works fine for a month or so at a time, then I get C2 - 13 error code. Did I hear this model was recalled?


Before calling service technician, open following link for Rheem troubleshoot resources including error codes and typical manuals.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Recall website:
http://www.tankless-recall.com/tanklessSearch.aspx
Error code C2 13 call Rheem.

Read manual cover-to-cover to make sure your tankless water heater receives yearly maintenance required for unit to continue working.
Tankless are maintenance heavy which can quickly eliminate any promised energy savings unless you de-lime and troubleshoot and read tips-and-tricks others have written and glean information from service technician who visits your house. Mostly glean how much tankless repairs and parts cost vrs buying whole new tank-type gas water heater at local box store, since all costs are energy.

Feb 16, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

7 Answers

BOSCH AQUASTAR 2400ES NATURAL GAS TANKLESS HOT WATER HEATER


the A3 & E3 codes are for the back flow sensor on the heater. Could be disconnected or a bad sensor. Call bosch tech support and they will help you with this.

Dec 30, 2008 | Bosch AquaStar 2400ES-NG

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