Question about Rheem EcoSense by 4.2 GPM Tankless Water Heater LP Gas

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Rheem Pronto Tankless water heater

The temperature range changes when I begin to take a shower.

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Your cold water supply check pressure

Posted on Oct 12, 2009

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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

Error c4-15 what does that mean


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

C4 can range from failed PC Board to lime build-up inside heat exchanger
Error 15 is 'heat exchanger is too hot', clogged heat exchanger, restriction in cold water inlet, temperature set point too high.
If you recently changed temperature setting, then that might be cause.
Tankless require monthy-to-yearly maintenance to avoid common error codes.
Delime tankless and clean water filter, keep temperature low.
Never install tankless water heater is best way to avoid complications of expensive water heater that is maintenance heavy, hard to diagnose, expensive to fix, etc.
Never expose tankless to more than 11 grains hard water.
http://waterheatertimer.org/pdf/Rheem-CondensingTankless-maintenance-2012.pdf
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

Aug 26, 2012 | Rheem Tankless Hot Water Heater...

1 Answer

Rheem Pronto water heater Error code E1


Before calling service technician, open following link for troubleshoot resources include Rheem chat, error codes, and regular maintenance manual, and possible product manual:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Clean the water filter as shown in product manual.
Error E1 is not specifically shown for Rheem/Pronto tankless.
1 is usually related to water flow.
E errors are related to temperature, so E1 can be temperature sensor failure on hot water pipe.
E errors can be loose/bad wiring or part failure.

Error codes are considered start-point for troubleshoot.
Each tankless manual recommends cleaning the water filter monthly, deliming heat exchanger yearly, and cleaning combustion chamber and burner parts yearly.
Regular maintenance can prevent most common error codes, but the cost and nuisance will outweigh expected $1-8 monthly savings on gas bill.
The requirement for continual maintenance should signal folks that tankless are not effortless hot water as described in tankless promotion.

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

Oct 02, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

Rheem pronto tankless water heater just barely warm model # 74pvn-1. This is in a house we are just purchasing. Also it looks like it may be attatched to another tank water heater , Help please


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

Sometimes people attach tankless to tank-type heater to preheat incoming cold water.
Additional tanks are also used to store solar heat, and some installations have tank-type because tankless is unreliable. Service technician can sort out the function correctly.
http://waterheatertimer.org/Tempering-tank.html

Owner should read tankless manual thoroughly, especially troubleshoot and maintenance sections. Tankless require yearly maintenance.

Since tankless are expensive to repair and replace, you might be able to fire up the tank-type water heater and provide hot water without much cost.
You can also install tank-type gas water heater yourself. Lowes sells 40 gallon for $317.00, and then you offer 10% less.
http://waterheatertimer/How-to-install-gas-water-heater.html

Apr 19, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

When taking a shower the hot water turns off. When I go to the tankless water heater it says C4 76. What does this mean?


Before calling service technician, open following link for Rheem troubleshoot resources including error codes and typical manuals.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
C7 76 is problem with remote control. Following link might help.
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Read manual cover-to-cover to make sure your tankless water heater receives yearly maintenance required for unit to continue working.
Tankless are maintenance heavy which can quickly eliminate any promised energy savings unless you de-lime and troubleshoot and read tips-and-tricks others have written and glean information from service technician who visits your house. Mostly glean how much tankless repairs and parts cost vrs buying whole new tank-type gas water heater at local box store, since all costs are energy.

Feb 18, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

I have a Rheem tankless pronto unit. I had a


is there any type of surge portection for tankless water heaters mother boards??????

Mar 06, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

What is trouble code C8 on a rheem tankless water heater


c8 is a cycle not a code... the code comes up after it, may look like a temperature... 2 digiti numbetr

Dec 26, 2009 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

3 Answers

Hi, I have a Rheem RTG-74PVN-2 tankless hot water heater. It has run great for about a year, but now shuts off completely after running for approx. 8-10 minutes. I have the water temp set at 130 f. Any...


Remove power source from the unit. If remote control is installed; remove cover and lift the control wires on the terminal...can be accomplished from either end. See if the unit runs longer.
If you're receiving any error codes, especialy code 76; contact RHeem customer support at (800-432-8373) and notify them IF you are getting a code "76" error.

Good luck,
JZ...

Nov 25, 2009 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

The temperature indicator changes as soon as I begin to take a shower. How can you help me.


try unplugging the controller to see if it's a glitch in the contoller. If not you probably do not have enough gas running to it so it can't heat the water fast enough due to lack of gas

Oct 03, 2009 | Rheem Tankless Hot Water Heater...

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