20 Most Recent Rheem Paloma PTG-74XN / RTG-74XN Natural Gas Outdoor Questions & Answers

Open following link for rheem tankless resources, including manuals, 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

manual can be ordered a local merchants

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

Before calling service technician, open following links for Rheem troubleshooting resources, including generic error codes and contact information for Rheem and recent manuals:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://www.fixya.com/tags/rtg_74pvn

Error codes are start place for troubleshoot, and multiple error codes can indicate bad PC board.
Same error code on one machine can be different cause and solution than another machine.

Error 76 is usually communication problem with remote control.
Disconnect wires from machine, and clean terminals is a start point.
Wire between machine and remote might be bad, or remote control is bad, or PC board or wiring connections are bad.

The problem might be solved by having technician catch the machine up on yearly maintenance.

Manual for same-similar product shows maintenance and troubleshooting and a few error codes, but not 76:
For the most part, the manual recommends calling service technician instead of offering DIY details.
http://waterheatertimer.org/pdf/DirectVentManualRTG-74PVN-1.pdf

Add a comment for more help.

Upvote the help.
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Following link shows preventative maintenance on page 28
Other Rheem tankless manuals show same information
http://waterheatertimer.org/pdf/DirectVentManualRTG-74PVN-1.pdf

I have also heard that tankless are susceptible to lime build up and should be de-limed each year.
Page 32 shows lime build-up as a troubleshoot cause.

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you via e-mail or phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Tankless questions are complicated because these units have many parts, and both internal and external issues can cause problems. Also problems can arise from combination of issues including maintenance, incoming water temperature, pressure, air quality, venting, water quality, water pressure, in addition to internal washers, gaskets, and parts functioning perfectly with each other over time.

Hot water only after a certain time of day indicates problem might be pressure related.
Which could be local water supply, or clog in line, or sediment on pressure sensor, failed pressure sensor, dirty in-line sediment filter, improper vent, or combination of things listed.

Rheem suggests calling service technician.
Service technicians train for years on one brand of tankless, and then see something new each day.
To understand why service technician is recommended, view number of UNanswered questions on following link showing one Rheem tankless model number.
http://www.fixya.com/tags/rtg_74pvn

I suggest avoiding tankless water heaters since all costs are energy.


Clogged pressure sensor after 2 years exposure to hard water. De-liming tankless will not prevent failure from hard water.

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Also take advantage of fixya expert assistance live.
For a price, expert works with you via e-mail while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

I got a new Rheem heater and it's complete garbage. No water pressure.

recently installed?

Brian sounds like it's Leaking From Anode rod.... Check here.... https://lildutchuncle.com/rheem-water-heater-leaking/

The three most common reasons for this happening to you are 1) a defective gas valve, 2) a rusty thermopile, and/or 3) the automatic shut-off not working as it should. So, the most common reason for many people having this problem stems from having a gas valve that is not working as it should. When your gas control valve is faulty, it will mean that your burner is not going to be igniting as it should-or at all. Something that worked for me one time was to turn the Temp all the way down then all the way to Max a couple of times..gradually. Why it worked I don't know. Got a couple more years out of it though. Good luck! Best to you.

there is pressure adjustment, just temp. water pressure in + water pressure out

I don't know for sure but look at page 117.... http://snowcrest.net/thriftysupply/pdf/RTG-Service-Manual-REV-2.pdf

Rheem furnace error code 68 is a mechanical relay system which signals the blower motor to stop because it has not received a signal from the thermocouple. Jul 20, 2022

Rheem furnace error code 68 - HVAC Contractors

Motor Power And Communications Issues (Fault Code "68")

ManualsLib https://www.manualslib.com > Rheem-96v-Series Motor Power And Communications Issues (Fault Code "68"); Line Voltage And Low Voltage Connections To The Communicating Motor - Illustrations - Rheem 96V Series ... ..