Tankless is leaking from pressure valve - Noritz 6.9 Gallon Residential Direct Vent Tankless Water Heater - N

The valves are the same specs. Is it possible that a new valve leaks, yew. However if both valve leak then there are other problems. Does the valve only leak when hot water is called for? Then check temperature setting on heater. Does it lek all the time? The water pressure is to high ,

• Maximum Temperature Setting (Deg. F): 210
• Maximum Pressure Setting (psi): 150

Why the relief valve at the water heater is leaking and what to do about it

Does tankless water heater require pressure relief valve

http://waterheatertimer.org/Low-hot-water-pressure.html

http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Old plumbing, and clogs can gather at elbows.
Plumbing repairs, faulty check valves etc can cause clogs.
Pressure gauge on water line can reveal if pressure drop is before or after the tankless unit.

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

1) Never, ever install tankless water heater, unless your wallet is 2" thick and you enjoy nuisance problems and recommended continual maintenance.
2) Add in-line air vent.
http://waterheatertimer.org/images/Air-vent-added-to-return-22.jpg
3) Look for check valve along the line. Look for mixing valve, pressure regulating valve, etc.
4) If you have recirculation system, remove cross-over check valve and see if problem is located there.
5) Contact Rheem. 800-432-8373 They will want model number, serial number, and name of installer. And might recommend contacting installer or plumber.
6) Increase water flow. Check water flow requirement of tankless (.5 gallons per minute activation) with actual flow at faucet.
7) Clean water filter at tankless unit.
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf
8) Crossover at single-handled faucet.
http://waterheatertimer.org/Crossover.html
9) Fix all leaking faucets indoor and outdoor so no air is being sucked in.
10) Bad TP valve on water heater sucking in air each time water pressure pulls on the valve?

Additional resources: No information about air-in-line
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Open following link for troubleshooting resources including Rheem contact information.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

High water pressure might be causing problem.
Use Brady BTG-100 pressure gauge to check pressure on nearby spigot.
Add a pressure reducing valve on incoming water line.
http://waterheatertimer.org/images/Check-water-pressure-250.jpg
Water heaters, tankless and tank-type are damaged by high water pressure 80 psi.
House plumbing fixtures also have shortened lifespan.

However if water pressure or water flow are too low, then burner will not activate.
Tankless are like bowling on a ship sometimes.

Repair most tankless water heater problems yourself, same day, any brand, for $320
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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

List of causes MIGHT include one of following:
Bad household circuit breaker that powers electronics, or loose wire inside outlet where tankless plugs in.
Tankless fuses and control board.
Water flow rate too low. Minimum .8 gallon required (depending on model)
Tankless inlet filter clogged.
Household aerators clogged at faucets.
Crossover at single-handled faucet
If installed, there can be crossover at mixing valve.
Faulty household check valve, including check valve on re-circulation system if that system is installed.
Restriction in household water line, such as clog at elbow.
Unequal pressure in household hot and cold lines, caused by restriction in hot line. When single-handled faucet turns on, the cold water pressure is higher so hot does not flow and tankless will not turn on.
Loose wire connection inside tankless.
Unit temperature set too high.
Unit temperature set too low.
Water temperature is very hot coming out of tap, so more cold is added, but that reduces amount of hot water flow, so tankless turns off because flow rate is too low.
On some tankless, if water is preheated by solar or other indirect source, the burner will not activate.
High mineral content in water > delime tankless yearly
Misaligned temperature sensor
Low gas pressure. Wrong type of gas. Undersized gas line.
Too many faucets on at same time.
Faulty tankless water valve. Water valve stuck.
Fluctuating household water pressure, for example MUD and PUD district water pressure problems or water well pressure.
Faulty household pressure reducing/regulating valve if installed.
Faulty household pressure tank, if installed -or- pressure tank needs to be installed.

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

http://waterheatertimer.org/pdf/No-Error-Code.pdf

Problems can range from sediment in tank, to clog in plumbing elbow, to degraded joint where copper and galvanized pipe meet, to crossover in single-handle faucet, to leak in water line, to leak in TP valve, to bad check valve, to defective re-circulation pump system.

That is the temperature pressure relive valve (TPV) . It is either foiled with some thing or going off because of a pressure or temperature problem. If it is leaking continuously it is foiled and needs cleaning. If I where there I would replace it with new.

Sorry to read about your problem, I hope this helps you out.

your WC pressure is fine it needs 3 and you have 5, can handle 8
The gas company adjust at meter, you have other issues

Check gas solenoid valves for open or short circuits.
Ensure igniter is operational.
Check igniter wiring harness for damage.

THIS IS A GAS PRODUCT, INCORRECT REPAIR CAN CAUSE A EXPLOSION, AND DEATH CAN OCCUR. IF YOU DO HAVE THE PROPER TOOLS SUCH AS MANOMETER AND LEAK DETECTORS, I SUGGEST YOU CONTACT A SERVICE COMPANY

You have to fix this leak around the water valve before
it causes damage to your equipment.
1. Close the water supply valve going to your tankless
water heater.
2. Unplug or close the natural gas valve.
3. Now, you can work fixing the leak.
4. Once completed, you can proceed to open the
natural gas valve as well as the water supply valve.
5. Then, have it tested to get it done.

5.

Certain water heaters can only handle so much pressure from the main line. There is a pressure controller between your water meter and you house, it's called a pressure regulator. You need to call a plumber to check and see if it needs to be adjusted or even replaced.