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Rheem tankless vibration when water is first turned on

Rheem tankless vibration caused by burner being activated after water is first turned on. This is a new install.

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This is cause by air in the gas line if the problem don't go away in a couple of days contact rheem there could be a gas control problem

Posted on Aug 12, 2010

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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...

1 Answer

My eco sense model #rtg-74pvn-2 get code c8 13


1) Copy following link for EcoSense-Rheem tankless resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

2) Error 13 is oxygen depletion sensor activated.
Get more fresh air to unit
Perform required maintenance.
Have qualified service technician test, clean, etc, and possibly replace burner.

3) Repair any brand tankless, same day, yourself for $368
http://waterheatertimer.org/How-to-install-gas-water-heater.html

4) Add a comment and say what you did to solve problem.

Mar 06, 2013 | Water Heaters

1 Answer

My rtg-74pjn-2 shows code c8 13


Hello Oumkaar Sharma,
Feb 2013

1) Copy following link for EcoSense-Rheem tankless resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

2) Error 13 is oxygen depletion sensor activated.
Get more fresh air to unit
Perform required maintenance.
Have qualified service technician test, clean, etc, and possibly replace burner.

3) Repair any brand tankless, same day, yourself for $368
http://waterheatertimer.org/How-to-install-gas-water-heater.html

4) Add a comment and say what you did to solve problem.

Mar 06, 2013 | Rheem Paloma PTG-74PVP / RTG-74PVP Liquid...

1 Answer

Raise temp above 120


Raising temperature above 120 degrees requires service call.
Or change dip switch settings and risk voiding warranty and causing service call expense.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#temperature

Earliest versions of Rheem tankless 2006-8 let you set temperature up to 140 degrees F using remote.
However the hotter setting caused error codes because the burner cannot keep up with both high temperature and large volume of hot water rushing through pipe. Especially in winter with cooler incoming water that must be heated more to reach temperature set point.
The burner simply cannot keep up.
So Rheem changed maximum temperature at remote control to tepid 120 degrees, which is not hot enough for folks wanting hot shower, or folks filling whirlpool tub because water in tub cools before tub fills.

Oct 27, 2012 | Rheem Tankless Water Heater Main Remote...

1 Answer

Rheem rte13 standby (green) light not on


You might have crossover problem caused by bad faucet cartridge.
http://waterheatertimer.org/Crossover.html

The green standby light should come on when 240Volt power is applied. Page 6 manual.
Both red lights should come on when tankless is activated. Page 6 manual

RTE 13 requires 60 amp breaker and 6 gauge wire
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html
http://waterheatertimer.org/pdf/Rheem-TanklessElectricUC_AP15447.pdf

Factory temperature setting is usually default 120 degrees.
Adjust temps page 11 manual
Thermostat calibration is always approximate.
120 degrees is not hot enough to burn the skin.
Exceptionally cold incoming water temperature can cause tankless not to heat enough hot water: install tempering tank to preheat water to room temperature.
Tankless cannot be exposed to more than 11 grains hardness in water. Delime tankless yearly, clean water filter monthly, do not install low-flow restrictions or conserve water since the flow rate must remain high for tankless to activate.
Rheem does not post service manuals for their tankless water heaters.
Call Rheem 800 432-8373

Aug 05, 2012 | Rheem Tankless Hot Water Heater...

1 Answer

My Rheem tankless water heater has been flashing a C8 and 76 code. I can turn off the heater using the power button on the unit, but my hot water will only last for a shower or so. Any suggestions? ...


Before calling service technician, open following link for troubleshoot resources including Rheem chat and contact, possible manual, error codes, etc.:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C8 76 is generally bad PC board. Call 800-432-8373
Just like a motherboard on your computer, the tankless PC board is operational center of tankless water heater.
Various sensors gather information from water pipes, gas line, vent pipe, and air supply to determine when to activate burner.
Most people understand that when their computer motherboard needs replacement, that computer will probably not work reliably again.

Tankless is basically connecting a complex computer to your plumbing and electrical lines and to a gas burner with a vent pipe to outdoors, despite knowing that plumbing lines, vent pipes, gas burners, and household electrical systems have plenty of problems on their own.

Age factor: When tankless is new and everything operates perfectly, the tankless works correctly.
And each tankless manual recommends yearly and monthly maintenance, just to maintain operation, the cost of which can exceed the expected 1-8$ monthly savings. And who wants to clean the water filter each month and delime the exchanger every year?
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Don't buy a tankless water heater because the only folks promising unlimited hot water and effortless water heating experience while saving money with a tankless are the tankless promotors.

Solve most tankless problems yourself, same day, any brand for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Sep 22, 2011 | Rheem Tankless Water Heater Main Remote...

1 Answer

The eco 180 dv tankless water heater will not turn on unless you run the tub/shower and lavatory at the same time. Running only one fixture at the same time will not kick on the water heater.


You have tankless water heater, and no error code.
Burner does not activate with one faucet, but activates with 3 faucets.
Best suspect is crossover:
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/pdf/No-Error-Code.pdf
Problem can be a combination of causes including Tankless part failure: sensors are not working, PC board is bad, wires are loose. Call service technician to catch up on yearly maintenance and troubleshoot problem. Tankless water heaters require yearly maintenance.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Jul 21, 2011 | Rheem EcoSense by 7.4 GPM Tankless Water...

1 Answer

PTG-74PVP-2; Where can I see/get/download a parts diagram? I continue to have O-ring failure on what appears to be the Water Flow Solenoid. The unit is installed at my vacation home, I shut down and...


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

May 02, 2011 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Our rheem pronto tankless rutg-74xp red light will come home indicating hot water and stay on about 2 minutes and then turns off we have turned off and back on and let water run for 5 minutes and will come...


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.

Apr 24, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

What is the minimum GPM's for a Rheem tanklers water heater to work? I can only run the shower by itself. Also can I install an outdoor tankless Rheem in an area where it gets down to -10 degrees F ?...


Rheem makes a number of tankless models
http://www.rheem.com/products/tankless_water_heaters/

They make a tankless 95 outdoor series
http://www.rheem.com/product.aspx?id=EBA80FAA-3C0F-411D-AF83-82061C28ED1B

The 95 outdoor series spec sheet says .4 GPM minimum activation and .26 GPM flow to keep burner activated. The colder the incoming water, fewer users can take a shower at once.
http://globalimageserver.com/fetchDocument.aspx?id=ea5f0816-dfd4-4bcf-a605-79945619f5bb
The .4 GPM and .26GPM numbers are fairly typical for tankless units.
These numbers are good when the unit is new.
After a few years the number may be different because the tankless is a high-tech machine with sensors that are susceptible to particulate in the water, and susceptible to perfect-functioning of other parts in the machine.
The outdoor series spec sheet says the tankless is good to minus 30 F.
But remember that's when the unit is new.
Outdoor tankless water heaters have an electric heater that keeps water pipes inside the unit from freezing, as long as electricity is ON.
If electricity goes off, the house stays warm inside for several hours.
But a steel box located outside would get cold immediately without electric heat.
The electric heater adds standby cost to operational expense.
The tankless has a heater, but you still have to protect the incoming and outgoing pipes.
If your incoming water is very cold, the tankless heater may not be able raise the temperature fast enough to give two showers -or- even 1 shower depending on age and efficiency and capacity.
You can add a tempering tank located in naturally warm area that passively pre-heats incoming water before it enters the tankless burner.
It might be best to locate tankless inside the house >> and use direct vent through the wall for both incoming air supply and outgoing vent gas.
If incoming air is taken directly from the living space, then tankless will draw air into the house through cracks and around doors.
A lack of sufficient air, or poor air quality can cause the burner to shut down.

When buying a tankless, read the spec sheets and really ask questions about everything you don't understand.

Oct 24, 2010 | Rheem RTG-53PVN Indoor Natural Gas...

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