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

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What does error code AO 21 mean on a Rheem pronoto tankless water heater?

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Error code 13, replace

Before calling service technician, open following link for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

The same error code and problem on one person's tankless unit can have different solution than another tankless unit.
This is because tankless require perfect operation of parts and sensors while being affected by incomming water and gas issues, and venting, plus plumbing factors.
Replacing one part is not always the fix, since that part interrelates with so many other parts, each affected by the operation of the other, and operation of the chip and integrity of wiring and wiring connections.

Read manual for yearly maintenance requirements, and calculate those costs when figuring anticipated $1-8 monthly energy savings from owning tankless.
Check that your region has reasonably-priced, qualified service technician for your brand before buying tankless. And check part list and cost of parts before buying any water heater because these factors weigh-in after a few years of operation.

Repair most tankless problems yourself, same day, any brand, for around $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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.

Posted on May 12, 2011

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  • 48 Answers

SOURCE: I am getting error code AO and the temperature

its most likely diplaying a code... is it code 21? that usually will follow ao. first make sure the door is securely on, if not make sure it contacts the switch

Posted on Jan 16, 2010

HVAC_Doug
  • 18 Answers

SOURCE: my rheem water heater is flashing an error code of

This means the solenoid to the modulating gas valve is sharing a fault. You will need to inspect the wiring to the solenoid to make sure it's ok. You can ohm out the solenoid to make sure it's not open. If it is, you will need to replace it.

Posted on May 22, 2010

  • 67 Answers

SOURCE: rheem gas tankless water heater with error code c4 13

problem is inside burner compartment o2 sensor dirty or block..need to have a qualify technician clean it.

Posted on Jul 31, 2010

SOURCE: Rheem tankless propane hot water

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

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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.
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Posted on Mar 23, 2011

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1 Answer

I am getting a C2 11 problem error on my Rheem tankless water heater, What that mean?


Just how much did you investigate this on the internet before asking here? I Googled " Rheem C2 tankless water heater" and found http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html. Look under Error Codes. Code 11 refer to gas supply/ignition. If you don't know much about tankles water heaters or gas ignition, call a Rheem Tech.

Dec 13, 2014 | Rheem Water Heaters

1 Answer

What does error code 13 mean?


1) Copy following links for Rheem tankless error codes
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Tankless-Error-code-13.pdf

2) Maintain water heater as shown in product manual to avoid common error codes.

Dec 28, 2012 | Rheem EcoSense by 7.4 GPM Tankless Water...

1 Answer

What does code 36 mean


Error code 36 does not show in Rheem tankless manuals.

Copy following link for general troubleshoot and error codes, and Rheem contact information:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error code 36 does not show in any resource, including 2008 service manual, or 2012 product manual.
Check that remote control display is illustrating the correct number.
For example there is error code 35.

Oct 19, 2012 | Rheem Paloma Tankless Water Heaters...

1 Answer

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.

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

1 Answer

Comes on for appx 20sec then gives code ao21


Before calling service technician, open following link for Rheem troubleshooting resources including error codes, Rheem chat and phone number, possible instruction manual, maintenance manual.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are considered start point for troubleshooting.
Error code 21 is "malfunction of air intake filter switch"
Make sure air filter door is properly seated.
Make sure front panel is properly installed.
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Aug 25, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

We have a Richmond Tankless water Heater that is flashing between A1 and 21 and not heating the water.


Error 21 means the air intake cover problem.

Malfunction of Air Intake Filter Switch Ensure air filter door is properly seated.
Ensure front panel is properly installed.
Error codes here: http://www.palomastore.com/paloma_error_codes.html

Richmond is Rheem
Typical manual shows regular maintenance on page 29:
http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf
The word maintenance is used throughout manual.
Tankless are prone to lime build-up and should be de-limed each year, and cannot be exposed to more than 11 grains of hardness in the water.

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.

Mar 01, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Error code 21 A1


This means the air intake cover problem.
21
Malfunction of Air Intake Filter Switch Ensure air filter door is properly seated. Ensure front panel is properly installed.
Error codes here: http://www.palomastore.com/paloma_error_codes.html

Mar 03, 2010 | Rheem Paloma Tankless Water Heaters...

1 Answer

My rheem water heater is flashing an error code of AO and 52. no hot water. what does this mean.


This means the solenoid to the modulating gas valve is sharing a fault. You will need to inspect the wiring to the solenoid to make sure it's ok. You can ohm out the solenoid to make sure it's not open. If it is, you will need to replace it.

Dec 23, 2009 | Rheem RTG-53PVN Indoor Natural Gas...

1 Answer

I am getting error code AO and the temperature


its most likely diplaying a code... is it code 21? that usually will follow ao. first make sure the door is securely on, if not make sure it contacts the switch

Nov 14, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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