Question about Rheem Water Heaters

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No hot water in the mornings. When temptures go above 55 degree s im able to power on the remote. Works above 50 degrees but in the morning when temp falls below 35 it turns off. Model rtg 74pvn 2 Rspair person said the sensors shut off when it gets to cold. Hat was a wasts of money. It ran perfectly for 5 years. Sometimes I get error code -0 then goes to 76. Nof all the gime tho. Suggestions

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  • Rheem Master
  • 5,245 Answers

Tankless computer is older that 5 years... then install tank type heater for $385 from local box store.
Otherwise copy following links:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#temperature
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Tempering-tank.html

Replace PC board (computer motherboard).
Catch up on required yearly maintenance.

Gene
h

Posted on Oct 13, 2013

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4 Suggested Answers

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Posted on Jan 02, 2017

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mrhotandcold
  • 248 Answers

SOURCE: Rheem RTG-74PVN-1 Water heats for abot 2 minutes

overheat stat or fan, on fan check for small pinhole in rubber tube best of luck

Posted on Oct 29, 2009

  • 67 Answers

SOURCE: Rheem tankless rtg 74pvn - heater hot water shuts

This is something you will have to contact rheem about due to the fact you don't have a fault code

Posted on Aug 12, 2010

  • 5245 Answers

SOURCE: Rheem Tankless wh model rtg-74pvn shuts off error code c4 76

Open following link for rheem tankless resources, includingerror codes and typical maintenance.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Posted on May 19, 2012

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Power has been off 48 hours; tankless water heater on exterior of house, temperature outside 12 degrees this morning. No hot water coming out of tap. Where do I begin?


-Sounds like every thing out side are frozen.
-You can not do any thing at this time. Just wait until the temperature rise and find out the water is running or not.

Good luck

Mai

Feb 19, 2015 | Water Water Heaters

1 Answer

Bosch gwh 425 hno-l


CHECK LIST

- is the BTU'S enough for the space
- is there proper flow through boiler
- should have 20'F-30'F difference between inlet and outlet temp
- is there air in the system
- is there a lock on via controls that is set to lock out under 20'F
- no matter what if boiler is working properly it should be able to maintain 20-30'F temp difference from inlet to outlet
ex. 60'F in, 85'F out = 25'F split boiler is working right, if temps do not rise means house insulation my be so bad BTUS calculated for the coldest conditions was to low

May 20, 2017 | Water Heaters

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

Im looking for the best option to get a Rinnai unit that would supply water at 30c or just below. i was going to buy the REU 55RT but looking at the manual i dont know how low the temp can get


Most tankless are preset to 120 degrees F.
30 degrees C is 86 degrees F.

If you want adjustable product, then tankless is not best choice.
Tankless are high tech gadgets with multiple interrelated parts controlled by sensors feeding information to control board. Everything internal and external has to be working correctly for tankless to work at all.
Most tankless brands do not suggest self-install, or self-adjustment, or any adjustment for reason given above.
You would be better off buying typical tank-type gas or electric and then thermostat adjustment is simple.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html
http://waterheatertimer.org/pro-n-con.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Add a comment for more free help.
Also 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.

Mar 23, 2011 | Rinnai Digital Remote Water Heater Control...

1 Answer

For the past couple of weeks, when we try to use hot water in the morning the system shuts off. The error message we get is C7. Often we can turn off the control panel, turn it back on again and then it...


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

Turn the power off and remove the cover. Find the two terminals that the remote control connects to and disconnect the remote control wiring. Turn the power back on and open the hot water tap and see if the unit comes on. If it comes on, this is a problem with either the remote itself or more likely the wiring between the remote and the tankless unit itself. Without a remote it will control to 120 degrees F. and will run without the remote.


I tried to help you. Please help me and Rate/Vote on my response, thanks and good luck

Dec 23, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

Rinnai Infinity 26 hot water system set to 55 degrees with remote temp adjuster. Water only luke warm for showers. Burnner working, water & gas pressure ok. Any thoughts ... Stephen


If you aren't getting any error codes, then the heater is probably doing its job. Your problem is probably somewhere in your plumbing system. The most common reason you get this sort of problem is due to cold water mixing in the hot water system. There are a number of causes for a "cross connection" :

-Faulty check valve
-Missing check valve on reciculation return line
-Faulty shower cartridge
-Thermostatic mixing valve set too low
-Faulty thermostatic mixing valve
-Faulty anti-scald valve

The easiest way to confirm a cross connection is to: 1) shutoff the cold water entering the tankless heater 2) open hot water valves around the house. If you still have water flowing at your hot water fixtures, then you have a cross connection.

Jul 09, 2010 | Rinnai Digital Remote Water Heater Control...

1 Answer

Whirlpool Energy Smart water heater not hot


I think some one mis informed you, the normal temp on any water heater from the factory is 120, it should not go above that for reasons of sevear burns, as far as it't smart part it's just a name, you will lose a couple of degrees just comming torm the tank to the faucets, the water heater will allways keep the temp in the tank at what ever it is set at, it doesn't have the brains or computer to know what time of day it is but when the cold water comes in to the tank it comes thru a dip tube that goes to aprox 1 inch from the bottom of the tank, if you take a long shower and do not have a energy efficant shower head you can use up to 5 gals, per min of hot water where an energy efficant one only uses 2.5 or less and still has the same pressure at the shower head, the temp in your water heater tries to stay at the setting it is at depending on how much is used at one time meaning washing machine, filling tub or dishwasher at the same time, it lets more cold in as the hot goes out and as you know it can only heat up so much at a time and the cold water is just going across the bottom of the tank, so the name is just that no diffrent then any other water heater unless you went to a tankless water heater.

May 29, 2009 | Water Heaters

2 Answers

No hot water


in and out hooked up right?

May 17, 2009 | Eemax EX280T2T Series 3 Whole House...

1 Answer

No hot water from tankless water heater. Bliniking Readout


http://www.rheemtankless.com/content/tankless/rheem/help.shtml

This is there website.Above.
Use the live chat to ask them, the code you listed does not seem to correspond to there code list, the only code that does is code 76,
which is a problem with the remote control not talking to the unit.
So your best bet is to tell them the error.

Apr 07, 2009 | Rheem Tankless Water Heater Main Remote...

1 Answer

New water tank not working


you need to check the tanks heater there are in a service area on the side of the tank these units heat the water in side the tank

Dec 12, 2008 | Water Heaters

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