20 Most Recent Rheem RTG-74PVN-2 Natural Gas Pronto Whole House, Natural Gas, Tankless Wat - Page 4 Questions & Answers

Check following links for error codes:
http://www.palomatankless.com/owners/homeowner+trouble.lasso
http://waterheatertimer.org/pdf/Paloma-Tankless-Error-Codes.pdf
http://www.tankless-recall.com/tanklessSearch.aspx

1) Rheem offers on-line chat, which you rarely see for typical tank-type water heater
http://www.rheem.com/products/tankless_water_heaters/customer_support/
http://www.rheem.com/hrc.aspx

2) Call local service technician, and put that person in your rolodex-wallet for future help.
When technician arrives, ask that person for tips and tricks keeping unit working with regular maintenance.
They will gladly offer yearly service.

3) Read manual several times get accustom to yearly maintenance required for tankless water heaters. Tankless water heaters are maintenance heavy. All costs are energy.

4) Read manual several times and notice word troubleshoot appears many times.
Since tankless are complicated machines, many internal and external factors can affect operation, especially as unit ages.

5) Look at label on unit to identify exact product number. Identify same/similar product at Rheem, and become familiar with Rheem website
http://www.rheem.com/products/tankless_water_heaters/

6) Read other question/answers at fixya about Rheem tankless to become familiar with the tankless era
http://www.fixya.com/tags/rtg_74pvn

7) Install DIY tank-type gas water heater and avoid the whole headache
http://waterheatertimer.org/How-to-install-gas-water-heater.html

8) 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.

Is the pump running! no-flow

could be a vent problem,check out side

Try running the hot water in the sink while you have the shower. If the water in the shower stays hot, then the problem is not enough flow through the water heater to keep the heater running. I am guessing that the master bath is further away from the water heater than the guest bath. If not I would check the shower nozzle in the master bath to see if it is clogged a bit or if it is a water saver nozzle because this will slow down the water volume and then cause the water heater to shut off the heat.

Try this link.

http://demandware.edgesuite.net/aabh_prd/on/demandware.static/Sites-Appliance-Site/Sites-CompactAppliance_Primary/default/v1298033256538/pdf/ownersmanuals/rheem/RTG74IndoorOutdoor_owners.pdf

3 items possibly:# 1) has that gas company turned off the gas lately to do some work?,and then re-fired the water heater after the work was completed? if so,check the temperature setting on the unit,as most gas companies upon re-start of gas appliances on their line will just set them to LOW,so as not to have an insurance issue with a scalding problem(from someone setting it TOO HIGH) if set above LOW temperature./ # 2) it could be limed up in the bottom and not have the capacity anymore to heat the full capacity of the unit due to this issue & needs shutting down and draining and a fresh re-fill. / #3) if the unit won't fire after the pilot has been lit(held down to keep lit) and then turned to a heat setting from pilot,you can have a defective thermocouple temperature sensor in the flame not letting the gas valve open fully to heat the unit

Error code 76 is the control board or the wire to the control board check wiring and contacks where the wires hook up make shure they are tight

Sounds like you may have to replace the thermal coupler. check your local hardware store for a replacement for your model.

http://www.rheemtanklessonline.com/rtg74.html
Above is a support link.
Most often almost any problem with these is to do with the Thermostat thermistor or main Board needs replacement.
However due to the fact it is a Gas appliance, one really MUST use a professional, to be safe.

Call Rheem for a new unit. They problem will never be fixed. They have redesigned the unit. It is now RTG-95DVN a self contained venting unit. Mine was worked on several times over two years and much frustration before they finally replaced it.

This is a circuit board problem you will need to contact rheem

hi. Rheem is an excellent company with excellent support for the customer. you can call rheem customer service at 8004328373 you will need model and serial # before they will help you but they will help you trouble shoot problem if you have all the information.

there is a malfunction of operational switch
you will have to press the max button on PCB to reset
and Press min button on PCB to reset
if that does not work you will have to get the PCB replace

there must be a return port on the unit itself or it cannot be done.

if the unit fire up and is hot at the point of the hot supply after 2-5 sec then there is no problem with the unit..it could be your plumbing.. usally you will get a code if there is a problem with the unit. if you do get a code note it and contact rheem..

Hi. Often, when initially hooked up the gas has not filled the line leading to the water heater. Open up the connection where the gas line is connected to the water heater just a crack until you smell gas. Then close the connection tight once again and go through the steps to light it. J.

PS if you still can't get it call your gas provider as they have a free service whereby they send a trained tech. out to fire it up initially.

I just changed mine today with help from Rheem support as the manual had a typo error.

You should be able to increse to 120 max as default. However if you want to change to 140, you will have to perform the following as detailed in the manual ...

- Turn off the power.
- Remove the cover.
- There is a dip switch on the controller board. Flip dip switch #4 to "ON". Your remotw will start flashing.
- Press SW2 on the controller board for at lease a couple of seconds (The manual states SW1 which is incorrect)
- Flip dip swich #4 back to "OFF"
- close cover
- Turn on heater ... you should be able to adjust up to 140.