Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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Rheem integrity sometimes fails to light so i then turn power off and on and it will usually start checked gas pressures and changed lpg regulator but still the same can you help at all thanks kevin

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  • kvhayes Oct 13, 2010

    Haven't got the book. It is flashing F before starting it again. have cleaned most things and serviced it. thanks

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  • Rheem Master
  • 43,501 Answers

Hi,
Does it give you a flashing code as to why it went into lockout?
You should look for the flashing LED and then check the book for the reason.
It is probably a pressure switch or a dirty flame sensor....if the gas press. is alright...
Check the venting to make sure it is open and in good shape also...

heatman101

Posted on Oct 13, 2010

  • D. Floyd Kolb
    D. Floyd Kolb Oct 13, 2010

    Hi,
    Here are the common error codes for your heater.

    You can also call the Rheem Tech support

    1-866-720-2076

    Available between 7AM - 7PM Central Time

    7 days a week



    Or you can go here and hit the live chat button


    heatman101

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1 Answer

Need to convert Paloma gas heater from natural gas to lpg in qld.


You can't!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Among other things besides having to reprogram modulation, you'd also need to re-jet it and that's not possible in the field. NG and LPG jets are not the same due to vastly different operating pressures.
Some brands can be field converted but not Paloma/Rheem/Richmond/Rudd Tankless units!

May 18, 2014 | Water Heaters

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Rheem 300170 HWS service manual


1) Rheem does not post service manuals.
Call Rheem and ask why, since the other big manufacturers, AO Smith and Bradford White do post service manuals.

2) You need new propane gas control valve, and matching combustion parts to fit existing tank.
http://waterheatertimer.org/pdf/Rheem-Water-Heater-parts-catalog.pdf
http://waterheatertimer.org/images/IMG_1826-LP-burner-450.jpg

3) Rheem does not recommend changing gas type, especially from natural gas to LPG.
LPG is higher pressure, and burns much hotter and requires cast iron burner, unlike the lighter-weight metal used for Natural gas burner.
The manifold tube and thermocouple must match the gas control valve, and gas-type and have correct thread for propane.
The combustion chamber and heat transfer surface can also be heavier metal for propane heaters.

Feb 08, 2013 | Water Heaters

2 Answers

Rheem RTG-64DVN model, brand new unit installed during the weekend. fired up but shout down automatically within about 5 seconds. showed error code 12.


contact your gas company if the error code is "12," indicating that the gas supply was interrupted.

have a good day !! In LP models, the 12 error code may also appear if the LP gas supply has gotten low. To clear the code, replace or refill the LP gas supply.

go here for a list of codes for rheem tankless water heaters-- www.ehow.com/list_7833182_error-rheem-gas-water-heater.html

May 09, 2011 | Rheem Tankless Hot Water Heater...

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

I have a bosch WR 400 LPG tankless, It will not start, there is some sort of ignition problem, batteries are new and it has gas at least to the regulator, I'm tired of taking cold showers, PLEASE HELP!


Hi,
These hot water heaters will drive ya nuts!!! They are great when they work but a bugger to work on...
The problem may actually be the flow sensor...often they fail to sense the flow and then do not ignite....
Is it actually trying to ignite the flame???
Is the flow switch turning the heater on?
If it is trying to ignite, do you have spark?
Does the pilot light at all?
Is the flame sensor clean?
Is power going back to the control?
Is the control failing to provide power to the gas valve(s)?

All these things need to be gone through and checked off...this will get you started towards finding the trouble...

heatman101

Sep 21, 2010 | Water Heaters

1 Answer

Rheem Integrity 24 Has Error LO79 can someone tell


79 is fan motor current fault or circuit board you will have contact rheem

Jun 07, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

My Rheem 40 gal. LPG water heater has sat for two years. When I attempt to light the pilot manually, it goes out after I release the push button valve knob?


The pilots have to warm up, hold that button down for a min, then let it go, it should stay on. Then crank up the pressure, it should light. If you are worried about it, call your gas man, he will check it out. Hope this helps.

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I have a Rinnai tankless gas water heater and this things beeping and flashing 12 everytime we turn on the hot water the water will get hot but you have to wait for it to stop beeping


Error 12 is failed ignition - this can be caused by many things, but normally a low gas pressure, or no gas pressure upon ignition.
Try turning the hot tap on very slowly till till the control shows burner is lit. Then turn it on faster. If it stays going with no error, you might have a faulty regulator, not opening fast enough to meet demand. Especially common with lpg models,a lot rarer on natural gas.

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1 Answer

Lp waterheater won't stay burning


check the pressure comming into the burner thru the gas valve, it has to have at keast 2,bs if not you might have to change the regulator

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