PTG-53XN error code p1. And hot water turns off.

Go to the manufacturer's website and enter your model number and click on "Support" and there should be a FAQ's or other support options for you. Otherwise the website may have a "Contact" phone number to call or a way to Chat online.

Low water pressure
Clean water filter
Change water filter cartidge
Check water flow to unit
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/Crossover.html

Gene

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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.

Does same thing happen at all faucets?
Are you getting error code?
You might have crossover problem with defective faucet cartridge.
Copy following links for troubleshoot resources:
http://waterheatertimer.org/pdf/No-Error-Code.pdf
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

In several cases i have had to change the pcb board.... code 76 is no communication between remote thermostat and pcb..... this is a problem the first generation rheems seem to be having.... contact rheem if under warranty you will need to get pcb and program chip sent to you. Really need a experienced tech to install board and program it for you...... hope this helps...

P1 error code is not enough water flow to operate the unit: increase water flow to unit.
http://waterheatertimer.org/pdf/Rheem-Error-code-P1.pdf
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are considered start-point for troubleshooting.
Page 18 of maintenance manual shows how to clean water filter monthly.
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Other causes can include faulty sensor, clogged in-line filter, clogged water softener, sediment in pipe, sediment at elbow, bad check valve, water leak, etc.

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1) I cannot find Rheem error code P1
http://www.palomatankless.com/owners/homeowner+trouble.lasso
http://www.palomastore.com/paloma_error_codes.html

2) BOSCH does not show P1 either:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

3) Best I could find is that folks with P1 error code report tankless fires for short period, and then turns off.
This implies air, fuel or vent problem, and can be internal, external or combination.

4) P1 appears frequently on control board descriptors, which might imply the error is control board malfunction.

5) Call Rheem 1-800-432-8373, and then add a comment to this thread and let folks know what you discover.

6) I will also call Rheem when time permits, and post what I discover.

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Remove power, disconnect remote terminal. Restore power, open a hot water valve and see if you get any hot water.

HTH,
Mike

code 14 is a big deal shut that thing down! you will burn it up if you keep running it, your over heat wrap on the heat exchanger is too hot. call rheem they can walk you through it

check to make sure the air vent is clean and that the front cover is on properly