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

1 Answer

My thermostat is flashing 240 and LH. What does this mean? I have had so much trouble with this Rheem Hot water Heater that I am tempted to go and buy the old fashioned kind. All I hear from people that own these is that they do not like them.

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Hi,

I was able to locate a manual for your unit.

See the link below:

http://demandware.edgesuite.net/aabh_prd/on/demandware.static/Sites-Appliance-Site/Sites-CompactAppliance_Primary/default/v1300218722880/pdf/ownersmanuals/rheem/RTG74IndoorOutdoor_owners.pdf

Then see page 33. The error code you describe is not specifically listed, and the manual advises that you call their customer service number for further assistance. This is the text for customer assistance:

Manufacturer's National Service Department at the following address:

2600 Gunter Park Drive

Montgomery, Alabama 36109-1413

Phone: 1-800-432-8373.

When contacting the manufacturer, the following information will be requested:

a. Model and serial number of the water heater as shown on the rating plate attached to the front panel

of the heater.

b. Address where the water heater is located and physical location.

c. Name and address of installer and any service agency who performed service on the water heater.

d. Date of original installation and dates any service work was performed.

e. Details of the problem as you can best describe them.
f. List of people, with dates, who have been contacted regarding your problem.

Posted on Mar 17, 2011

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2 Answers

Brand new electric hot water heater doesn't get water hot


Call Rheem
Reset breaker fully off and then fully on.
Test for 240 Volt across top two screws on upper thermostat
Press reset button located on upper thermostat
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#reset

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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

I have a Rheem Marathon 105 gal. electric hot water heater. No hot water ....


Check 240 circuit breaker.
Open top cover on water heater and push in ECO red reset button.
If reset button will not reset, then replace thermostat.
If reset is not tripped out, then either upper thermostat is bad, upper element is bad, or water heater might be getting 120V instead of 240V.
If you have some hot water, then best suspect is lower element.
http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html

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.

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1 Answer

Rheem 40 gal. elct. have 220 at both elements all the time but only one drawing?


Your testing may be off here. Or you might have special order 'simultaneous' wired water heater.

Water heaters with two elements are 240V.
Elements test for 120V at all times, but with ordinary non-simultaneous water heater, only one element at a time has 240. This is called non-simultaneous operation.
Open links below for understanding of water heater operation.
http://waterheatertimer.org/How-it-works.html
http://waterheatertimer.org/How-water-heater-thermostats-work.html
http://waterheatertimer.org/B220C.html

If both elements were drawing 240 at one time, then upper thermostat is bad, or else your water heater is wired for simultaneous operation, and one of the elements is burned out.
http://waterheatertimer.org/How-to-test-water-heater-element.html
Your tank might be wired for simultaneous operation, if water heater was special order from Rheem, or if somebody changed wiring and set lower thermostat-and-element on a separate circuit breaker.

If you have simultaneous operation, then you would have 2 circuit breakers and 2 wires going to water heater or one 50 amp breaker with 8 gauge wire to heater. If this is the case, then both elements could test for 240V and one of the elements is bad, and thermostats are ok.

If you have ordinary Rheem water heater, then it is wired for non-simultaneous operation where only one element is ON at a time. This is called non-simultaneous operation and you can check because water heater has one circuit breaker rated for 20 or 30 amps.

Rheem elements are 4500Watts.
If both elements were ON at same time, that would be 9000Watts, which would trip typical water heater 20-30 amp circuit breaker.
9000Watts divided by 240 volts = 37.5 amps
So if upper thermostat is bad, and it is turning on both elements so they both test for 240, then thermostat is bad, but also one of the elements has to be bad.
Or test is inaccurate.
Interesting puzzle.

Add a comment for more free help.
Also take advantage of fixya phone service.
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Fixya is always less expensive than a service call.

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Rheem warrior glass serial num-rh1098154699 model num-71-40d b That is all the information i collected off my hot water heater we have no hot water at all and i dont know how to fix this problem...


The label would also say if water heater is gas of electric.
That would be helpful information that could lead to troubleshooting.
Serial number tells us water heater was made on Nov 1998, which tells us the manual will not be on the Rheem website.

So if you have electric water heater, and no hot water.
There can be 4 causes.
1) Circuit breaker is not delivering 240 to water heater. Test top two screws on upper thermostat to see if tank has 240V.
2) ECO red reset button is tripped. Open top cover on tank and push reset button.
3) Upper thermostat is bad. Replace thermostat.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

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1 Answer

Water is not hot, doesn't last long. Thermostats turn elements on when turned up. Elements show 230 when on.


Lower element can be burned out and still read 230V across screws

1) We know thermostats are working because elements test 230V.
2) We know upper element is working because tank has some hot water.
If upper element is burned out, tank will have no hot water.
http://waterheatertimer.org/How-it-works.html

3) Here's how to test lower element:
http://waterheatertimer.org/How-to-test-water-heater-element.html

4)Here's how to replace element
Rheem element is 4500Watt bolt-in type
http://waterheatertimer.org/How-to-clean-sediment-out-of-electric-water-heater.html

5) Rheem manual says: Heaters furnished with standard 240 volt AC, single phase non-simultaneous wiring, and 4500 watt upper and lower heating elements.
http://waterheatertimer.org/pdf/Rheem-spec-sheet.pdf

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