1) Check for crossover:
http://waterheatertimer.org/Crossover.html
2) Copy following link for Rheem Tankless resources including no-error-code:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
3) Add comment and say what you find.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
SOURCE: model PTG-42PVN
According to the symtoms...sounds like you have a problem with the flow control valve. If less than 3 yrs old, contact Rheem Customer Support at (800-432-8373) and they can an authorized tech in your area to service the unit.
If the unit is out of warranty, I reccommend you still call customer support to find a local technician. Unless you're highly technical/mechanical, this is not a problem you should attempt yourself.
Thanks for trying Fixya.com
Mike...
SOURCE: Paloma PTG 74PVN Tankless Water Heater
did you check the filters on the the water valves, i am not exactly sure about your codes that are shoeing but if you could read it and post them, i know on some of the units 76 means there is low water pressure and the filters are behind 2 caps one on each side above the shut off valve take off the caps and remove the screens, clean them and replace them ,, make sure you turn off the water on both side first or you will get wet
SOURCE: I have a gas Rheem
Sounds like you have cold water entering the hot pipe, or crossover.
(A) Put bucket under water heater overflow pipe, and stand back from scalding water. Gently open and close the TP relief valve on water heater. Check temperature of water to see if heater genuinely has hot water.
It could be the water heater has sediment build-up and is no longer able to heat the water, or the gas thermostat is bad.
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html
(B) If water heater has hot water, and hot is not getting to faucet, then you have a crossover problem somewhere.
1) This problem can be located at crossover point of a recirculation system, if re-circ check valve has failed.
http://waterheatertimer.org/Water-heater-recirculation-system.html
2) Failure of a single handle faucet cartridge can cause crossover.
Read how to test for crossover:
http://waterheatertimer.org/pdf/Crossover-on-single-handled-faucet.pdf
3) Other causes for crossover are a failed check valve elsewhere in the plumbing system, for example on the pool equipment. Also a failed mixing valve which is usually installed on top of the water heater so that some areas of the house like laundry room receive very hot water, while the kids bathroom receives lower temperature water.
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SOURCE: error 13 paloma tankless hot
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.
Testimonial: "Thankyou for the advice. Really helped. How do you go about finding a paloma tankless hot water heater technician in ithaca, N.Y.?"
SOURCE: I have Paloma PTG2 42PVN No water flow when I open
Question is not clear.
Does all water flow stop? Or does hot water flow stop?
Open following links for possible help.
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Low-hot-water-pressure.html
http://waterheatertimer.org/pdf/No-Error-Code.pdf
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
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Thank YOU Geno backfeeding faucet thanks for everyones commnts and help
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