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

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My richmond tankless water heater flashes a error code c7 and c8. sometimes it works great but more often then not it flashes the codes. how can i fix it myself?

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  • Rheem Master
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Posted on Jan 02, 2017

mrhotandcold
  • 248 Answers

SOURCE: I have a richmond tankless water heater and its

1/overheat stat 2/ fan 3/diaphrapm valve 4/ micro switch check area around fan very small hose pipe for pinhole best of luck

Posted on Oct 30, 2009

  • 244 Answers

SOURCE: Paloma tankless, gas, water heater, error code C7 76

If you look on the left hand side of the burner control module you'll see 4 capacitors - the capacitors have most likely failed...pretty sure anything code 76 is P/S failure. It may also be covered for manufactures defects. If the cap is blown..the top will be slightly raised as apposed to flat like the other nearby caps - they are called top blow capacitors...the damage should be evident.

Posted on Nov 01, 2009

SOURCE: New Richmond tankless water heater C8 error

I think error code C8 is #13
It has to do with air quality, lack of sufficient air, or lack of venting or dirty air filter.
Check following links to see if they have information:

Check following link for recall list:
http://www.tankless-recall.com/tanklessSearch.aspx
Manual shows error 05 or 13:
http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf

Posted on Feb 27, 2011

SOURCE: My Richmond tankless water heater

Richmond is Rheem.
Following links are meant to assist resourceful do-it-yourselfer solve long term maintenance issues that tankless pose.

Error 76 is communication fault with remote control.
Check following links for Paloma 'Rheem" error codes:
http://www.palomastore.com/paloma_error_codes.html
http://www.palomatankless.com/owners/homeowner+trouble.lasso

Best place to start is your manual. Following link show typical Rheem manual with the words troubleshoot and maintenance throughout manual.
Read manual several times before buying product to see yearly maintenance requirement and complexity of tankless water heaters.
http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf

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/

Contact Rheem: they will usually kick you back to local service technician.
http://www.rheem.com/Contact.aspx

Check following link for recall list:
http://www.tankless-recall.com/tanklessSearch.aspx

Rheem website is not easiest to navigate, but manuals appear for current models.
http://www.rheem.com/products/tankless_water_heaters/

Read other Rheem questions at fixya to gain wider experience with potential problems and solutions.
http://www.fixya.com/tags/rtg_74pvn

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

Post question on pro water heater forum: This is where I go to catch up on latest info in fast-evolving water heater industry.
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Pay for answer at fixya:
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.

Posted on Mar 18, 2011

  • 17 Answers

SOURCE: Paloma tankless water heater model no PTG-74XP-2 error code c8

In several cases i have had to change the pcb board.... code 76 is no communication between remote thermostat and pcb..... this is a problem the first generation rheems seem to be having.... contact rheem if under warranty you will need to get pcb and program chip sent to you. Really need a experienced tech to install board and program it for you...... hope this helps...

Posted on Aug 24, 2012

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1 Answer

C7 error code what is the problem


Copy following link for Rheem/Richmond/ Ecosense tankless computer troubleshoot and error code resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
C7 might mean tankless computer motherboard has gone bad
If tankless is older than 5 years, then cut losses and replace with tank-type heater so there is less maintenance and repair expense, and homeowner or local plumber can make repairs without calling tankless computer technician:
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Gene

Aug 08, 2013 | Water Heaters

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We are getting multiple codes. Can someone help us. Last year we got cod c2 11 which we found out we just have to clean the probes in the unit. So we did that yesterday again and everything worked great,...


Rheem, Richmond, Ruud, and Paloma are all the same manufacturer. After about 9 months, my tankless RTG-74PVN started giving me error code 11 and cold water!. I fixed it by cleaning the burner, as shown in this video:
www.howtolou.com/clean-a-burner

Jul 31, 2011 | Rheem EcoSense by 7.4 GPM Tankless Water...

1 Answer

Remote is flashing C8 and 76, alternating. I turn the unit off, then back on, and I get hot water for about 10 seconds, then it goes cold and the same error message occurs. Unit is Rheem Main Remote...


Before calling service technician, open following links for Rheem tankless resources including error codes and Rheem chat.
Disconnect wires from remote to see if system stabilizes. Unit will heat to default temperature without remote.

Error codes are considered start-point for troubleshooting.
C8 76 can mean PC board failure.
76 can mean communication failure with remote control
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Jul 31, 2011 | Rheem Tankless Water Heater Main Remote...

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Getting a 76 flashing on my Paloma PTG-74XP tankless water heater


Error code 76
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf
http://waterheatertimer.org/pdf/Rheem-Tankless-Fault-codes.pdf

Open following link for Rheem/Paloma/Richmond/Ruud tankless troubleshoot resources including error codes, self help, manuals, parts links, tips, and contact information.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.

Add a comment with your experience so others with same-similar problem can benefit.

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 30, 2011 | Rheem Paloma PTG-74XP / RTG-74XP Liquid...

1 Answer

C7 andC8 plus 76 flashing on my remote


C7 C8 76 error code, can be PC board fault, and/or communication fault with remote.

Open link to read one possible solution:
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Open following link for Rheem/Paloma/Richmond/Ruud tankless troubleshoot resources including error codes, self help, manuals, parts links, tips, and contact information.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Add a comment with your experience so others with same-similar problem can benefit.

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.

Dec 16, 2010 | Rheem Tankless Water Heater Main Remote...

1 Answer

I have a richmond tankless water heater RMTG-74PVN-2 . the unit works most of the time but code c-2 comes up on the display and the unit shuts down. I shut the power off to reset this does not fix the...


I have a Richmond tankless water heater PTG2-42PVN. It will work for a very short time & then I get an error code of either C4 or C7. The remote control alternately flashes IL - 120

May 16, 2010 | Rheem Tankless Hot Water Heater...

2 Answers

My new tankless WH stopped working. It gives hot water for about 15 sec, then starts flashing C7 12 or C2 11. How can I fix this, We had it for a month now & it worked before.


11 The Gas Shutoff Valve is not opened
completely.

12 Gas Service has been interrupted.
LP Gas is running low. (LP models only)

I think C7 is where the startup sequence ended...and then you get the error code

If less than a month old...contact your customer support

Nov 01, 2009 | Rheem EcoSense by 7.4 GPM Outdoor...

1 Answer

I have a richmond tankless water heater and its been shutting down and showing a code c7 or c8


1/overheat stat 2/ fan 3/diaphrapm valve 4/ micro switch check area around fan very small hose pipe for pinhole best of luck

Oct 30, 2009 | Rheem Tankless Hot Water Heater...

1 Answer

New Richmond tankless water heater C8 error


I think error code C8 is #13
It has to do with air quality, lack of sufficient air, or lack of venting or dirty air filter.
Check following links to see if they have information:

Check following link for recall list:
http://www.tankless-recall.com/tanklessSearch.aspx
Manual shows error 05 or 13:
http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf

Sep 01, 2009 | Rheem Tankless Hot Water Heater...

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