Question about Rheem Paloma PTG-74PVN / RTG-74PVN Natural Gas Indoor

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I am getting error code AO and the temperature

I am getting error code AO on the Rheem Paloma tankless heater and the temperature isn't set anymore, what does that mean?

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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

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I have a Paloma PTG-74PVN-1 high volume tankless water heater installed in 2007. Recently, I am having hot water temperature problem, no error code is displayed, but it can not heat the hot water beyoun...


Even though you are not getting an error code, there are may be some diagnostics in the controller that can identify whether it's an electronic (controller/sensor) or a heat exchanger issue. I would contact Rheem tier-2 support.

Jul 01, 2014 | Rheem Paloma Tankless Water Heaters...

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Thermostat is set @120 then drops to 65 and starts flashing. Water get cold. What is the reason . Thanks


Rheem Paloma tankless computer? No error code? One possible cause; Crossover caused by bad single handle faucet cartridge drawing cold water into line causing shut down of tankless burner?
Copy following links for resources:
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Add a comment as needed.
Gene
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Aug 19, 2013 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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I have a paloma tankles water heater model #ptg-42pvn i am getting an intermitent error code C4,12. what is the problem?


Copy following link for Rheem-Paloma tankless troubleshoot and error codes:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html#install

If unit worked before: Maybe bad PC board. Maybe lack of required yearly maintenance.
Common error codes can be caused by not following maintenance protocol such as cleaning combustion parts, checking gas pressure, checking venting, and air intake, bleeding gas line etc.
Too bad Rheem-Paloma manuals do not show HOW to conduct this maintenance, leaving customer with many unknowns, and no way to oversee that maintenance performed by hired technician is complete, and matches recommended maintenance.
Sell unit on ebay, and install tank-type gas water heater.

Mar 20, 2013 | Rheem Paloma PTG-42PVN / RTG2-42PVN...

1 Answer

Error Im getting is C8 82


Before calling service tech, copy following link for Rheem-Paloma troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
C8 is usually the PC board, or could be failed gas solenoid valve.
82 is gas-type-data-failure = program PCB for proper gas type, or proper altitude above sea level.

If this is new installation, Rheem-paloma might tell you to contact the installer.
If this is older tankless that worked before, then things point to failed PC board. Rheem-paloma may send you new PCB for free if unit still under warranty period for defect parts.

Rheem does not post service manuals, but will send instructions.
Hopefully the success rate for replacing your main PC control board will have better outcome than expected when replacing motherboard on your computer.
Perform regular maintenance to avoid some common error codes.

Aug 16, 2012 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

What can cause Hot/Cold spikes on an RTG74-XN


Crossover, low hot water flow, low water pressure, sediment in water lines or heater, heat exchanger needs to be de-limed, water filter needs to be cleaned, water heater temperature set too high, incoming water temperature too high or too low depending on model, MUD or PUD districts with pressure spikes, dirty faucet aerators, loose wires, bad sensor, faulty PD-board, bad venting, dirty burner and combustion parts, etc.

Crossover
http://waterheatertimer.org/Crossover.html
Clean water filter monthly, de-lime tankless yearly
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf
No error code:
http://waterheatertimer.org/pdf/No-Error-Code.pdf
Overcoming fluctuating temperatures:
http://waterheatertimer.org/pdf/Bosch_Overcoming_fluctuating_temps.pdf
Resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Sep 20, 2011 | Rheem Paloma PTG-74XN / RTG-74XN Natural...

1 Answer

Error 13 paloma tankless hot water system. no hot water


Before calling service technician, open following links for error codes, Rheem/Paloma chat and tech support, and possible manual:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://www.fixya.com/support/t3444443-paloma_tank_less_water_heater_flashes

Error codes are considered start-point for troubleshooting.
Tankless manuals recommend yearly service including burner cleaning, gas pressure and plumbing check, de-liming etc to prevent problems and so technician is familiar with that specific unit.

Aug 05, 2011 | Rheem Paloma PTG-74PVN / RTG-74PVN...

2 Answers

Getting a 76 flashing on my Paloma PTG-74XP tankless water heater


Error code 76
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf
http://waterheatertimer.org/pdf/Rheem-Tankless-Fault-codes.pdf

Open following link for Rheem/Paloma/Richmond/Ruud tankless troubleshoot resources including error codes, self help, manuals, parts links, tips, and contact information.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.

Add a comment with your experience so others with same-similar problem can benefit.

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 30, 2011 | Rheem Paloma PTG-74XP / RTG-74XP Liquid...

1 Answer

My tankless indoor water heater has an error code C4 76


Error code 76 indicates a communication error with the electronic board and the unit. Call Paloma/Rheem with the serial number and model number of your unit and they will, in most cases, send you a new board with instructions on how to easily replace the board.

Tech Support: 800-432-8373.

Nov 21, 2010 | Rheem Paloma Tankless Water Heaters...

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