Question about Rheem RTG-74PVN-2 Natural Gas Pronto Whole House, Natural Gas, Tankless Wat

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The hot water just turn cold by it self and wont come back. I have to go to the attic and unplug and then plug back, it will then work. It does this again next time in the shower, midle of the shower, water turn cold and wont come back. Also, I do not have a romote control installed anywhere. is ther suppor to ? Model RTG-74pvn-2

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Before calling service technician, open following link for troubleshooting resources, including possible manual, and Rheem chat.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Rheem usually asks you to call local service technician.

There are many factors that cause problem you describe: bad PC board, sensor problem, loose wires, crossover in single-handled faucet, lime build-up in heat exchanger, clogged water filter.
The remote control might give you an error code. Error code is a starting point for troubleshoot.
Error code on one unit can have different cause than same error code on different unit.

Read manual for required maintenance.
Tankless require yearly maintenance.

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Posted on May 26, 2011

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Electric tank water heater is in attic. When outdoor temps are high it doesn't work. Why?


Hi Jan:
Really interesting............
A puzzle I've never encountered before.
I'm a retired Contractor and Building and Plumbing Inspector so can offer an answer based on experience.
- In hot weather, attics get REALLY hot.
- An attic is an unusual location for a hot water tank.
- A thermostat senses the temperature of the water in the tank and determines when it needs to be heated.
- I would be suspicious that in your installation, the temperature in your attic is higher than the "high limit" for your water heater.
To phrase it another way, since the attic temperature is really high, and the tank thermostat is in the attic, it "thinks" that the water is already at the required temperature.
The only real "fix" that I could suggest would be to locate the hot water tank in the moderated temperature area of the dwelling.
Hope this helps.
I would appreciate your letting me know by comment to this post if that is the problem.
Cheers, and thanks for the puzzle.

Apr 24, 2016 | Water Water Heaters

1 Answer

I have a GE Profile Water Heater Model #SE40M12AA01.


I recommend safety changes to prevent ruptured water heater and assorted leaks.
135 degree hot water.
Maybe replace TP valve if it is dripping.
Drip pan under water heater with 3/4" drain line to outside.
Expansion tank on incoming cold water line to absorb pressure build-up, and prolong life of tank and plumbing.

Here's why:

1) Yes you can have scalding hot water.

2) I recommend 135 degrees since that will burn the evil right out of ya. And generally kill clothes washing bacteria.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html

3) 150 is dangerous and can seriously burn skin in 1.5 seconds. Not safe around children and elderly.

4) Temperature settings on electric water heater are approximate, since thermostats are calibrated approximately, and read temperature through tank wall.

5) Also if you want to increase amount of hot water for high-consumption household, then setting tank temperature upward is one solution since more cold water is mixed with hot, so amount of hot inside tank goes further.

6) High temperature can cause TP valve to release water.
TP valve is pressure-temperature safety valve. Do NOT cap off.
Rating should be 125 psi and 180 degrees ... but all things water heater are approximate, and TP valves need replacement now and then.
It is not recommended by water heater manufactures to use 150 psi TP valve when water heater came with 125 psi. Rating shows in small print on end of TP. New TP valves sold at local hardware. Let tank cool before installing new one.

7) Higher temperature and high pressure can rupture tank.
Pressure over 80 psi shortens life of water heaters and plumbing fixtures. Put BTG100 pressure gauge on water heater drain valve to check pressure.

8) You need a drip pan with 3/4" drain line to outdoors, or to drain vent line, to prevent flood caused by ruptured water heater.
Turn water heater off when going on vacation.
Inspect water heater each 6 months.
Drip pan available at local home center or hardware:
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html#drip

9) Heated water expands and puts pressure on tank and pipes.
Water does not compress... so when water gets hotter it expands against tank wall and against pipes.
Especially in closed system (check valve present) when system is without expansion tank.
Expansion tank is installed on incoming cold water line.
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html#expansion

Oct 31, 2012 | Water Heaters

2 Answers

I have a Powerstar Electric tankless water heater, 45-551301, installed in a new home less than 3 years ago. We have always had minor problems with the hot water staying hot, fluctuations in hot and tepid...


Tankless heater are a little frustrating sometimes but this is generally an issue of waterflow I believe. The fluctuations are do probably to the amount of water and rate of water going through the heater. If you have a shut off valve on the cold side of the heater, shut it back about half way. This will slow the water going through the heater and allow the heater to heat it up more efficiently. Then go to the shower, turn the hot on all the way (no cold) and allow it to heat up. Once it has heated up, test it by hand for a good temperature that you like. If it is too hot, turn the cold on just a bit until it comes to the temp you like. If it is too cold turn the hot down just a little (still no cold) and it will warm up. Ideally you should be able to turn the hot on full blast and then just turn on a little cold to get the right temp. Once you learn how these work then it makes it easier. You really cant run the water like you do with conventional hot water systems and expect to get the same results. Also, wanted to give you another little tip. Every 6 mos to a year, you should flush you heater with vinegar for about 30-45 minutes using a small cheap submerible pump like for a water feature in a garde. Just put in a bucket of vinegar and and run a hose to the "in" side of the heater and another from the "out' side of the heater and then back into the bucket. This will circulate the vinegar inside the heater and clean all the deposits that will DOA your heater. Funny how the manufacturer wont tell you this but these deposits will ruin the connectiosn on the heating elements. You can make your heater last for a long time if you do this.

Mar 27, 2011 | Bosch PowerStar AE115 Tankless Water...

1 Answer

I have the exact same problem, house is only 6 years old, two handel faucet, Ive turned off the cold side to eliminate it, turn on hot and have to run at full blast and it takes a full 10 minutes to get to...


You have a clog in the water line?
Or a faulty check valve or mixing valve?

Add a comment and say how you fixed the problem, or add more information about size of pipes.
It seems like the cold water is getting into the hot water line somehow. There is no other explanation, as much as I can see from 800+ miles away.
If you have crossover on a single-handled faucet where the cartridge is bad, that can cause this problem.
Slab house can have plumbing in attic. It can be a chore to drop poly pipe down into walls, but it can be done with angle drill. Assuming walls are 8 foot high and pipes can be easily dropped to sink level where the sheetrock is removed and new pipes tied into sinks and tubs.
This kind of DIY project would take a couple weeks working a few hours each night when temps cool off, depending on size of house and number of affected faucets.
I live in Houston on a slab and ran my pipes in the attic when I built the house. Of course I worry about broken pipes collapsing the ceiling and filling the house with water, which happened to lots of homes one year when temps dropped to 4 below. I was in the painting business at that time, which was a boon to business for a few weeks.

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

Dec 17, 2010 | Laing Thermotech Autocirc Undersink...

1 Answer

Water temp. at the tap fluctuates


It is likely the inlet filter is plugged. this reduces the flow and then the heater adjusts the burn rate down to protect itself. the filter screens are small and plug easily. It would be a good idea to install a larger pre filter on these heaters.

May 30, 2010 | Bosch 2700ES Natural Gas AquaStar ...

2 Answers

After water to house was shut off, my Noritz tankless water heater is on but won't produce hot water. On the unit, the light indicating that the burner is on stays off now.


you probably had debris get into the filter or flow sensor when the water was turned back on. I'd recommend checking the filter first and if that doesn't work, call Noritz Tech support to help you with the flow sensor.

the filter is a black plug located on the cold water line (labeled cold on the bottom of the unit). It points torwards the left.

Apr 14, 2010 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

1 Answer

WE HAVE CHANGED THE THERMOSTATS BOTH OF THEM, WE HAVE CHANGED BOTH ELEMENTS AND THE WATER STILL DOENT GET HOT ENOUGH. WE HAVE TURNED UP BOTH THERMOSTATS AND STILL NOT HOT ENOUGH. WHEN YOUR RUNNING THE HOT...


WE THOUGHT WE NEEDED ANOTHER THERMOSTAR, BUT WHEN WE WERE LOOKING FOR THE PART THE EMPLOYEE ASKED WHAT WAS THE TROUBLE. WE EXPLAINED, HE SAID YOU DEFINATLY DO NOT HAVE A PROBLEM WITH YOUR TANK AND ASKED IF WE HAD A SINGLE HANDLED FAUCET WITHIN THE HOUSE. NO WE DONT. HE SAID IT SOUNDS LIKE WATER IS MIXING WITH THE COLD WATER THATS THE REASON FOR THE WARM--COLD--WARM WATER. COME TO FIND OUT SINCE WE ARE REMODLING THE BATHROOM, WE HAD BOTH THE HOT AND COLD WATER TURNED ON IN THE SHOWER--BUT WERE PLUGGED OFF AT THE SHOWER HEAD AND THE FAUCET UNTIL THE TILE IS INSTALLED. SOOO ALL MY HUSBAND HAD TO DO WAS TURN OFF THE WATER IN THE SHOWER. NOW WE HAVE PLENTY OF HOT WATER, NO WARM COLD. YEA!!!

Jul 06, 2009 | Whirlpool Water Heaters

1 Answer

Rheem small 6 gallon water heater vibration/noise


If the water heater is working fine than I would not worry about the function of the water heater. What the problem may be is that some of your WATER LINES HAVE MOVED, AS THEY WERE NOT SECURED PROPERLY. The sound you may have heard was the Copper or PVC(Plastic) lines just getting back comfortable. I Suggest checking that your water lines are secured about every 3 or 4 feet with the proper ancjhor....Metal for metal pipe, copper for copper pipe, etc. Sometime as in my house, pipes are run through a hole drilled through a stud or a piece of wood, usually when hot water is run through this pipe. You can here an expansion of the water line interacting with the pipe expanding, if the hole in the wood was not drilled big enough......Experience of remodeling a very old house.......Joe

Dec 31, 2008 | Rheem 81VP6S/430126 Water Heater

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