SOURCE: water heater not heating it's a richmond water heater
Now change the thermostats........this is the only other thing it could possibly be.
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
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.
SOURCE: richmond tankless water heater will not clear error code
Why is it always Rheem problems?
Every water heater problem at fixya is Rheem.
And Rheem doesn't post any service manuals, like the other two big manufacturers, AO Smith-American, and Bradford White.
Rheem 2012 manual says if error 13 still displays, then contact installer or service technician. Mo Money buddy.
This is about oxygen sensor, poor combustion, bad venting, inadequate air supply, failed sensors, etc.
Get more fresh air to unit and see if that solves problem. The call service technician, and get out wallet.
Copy following link for Rheem-richmond tankless troubleshoot.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Maintain water heater according to instructions in manual to avoid common error codes. Of course this means you have to service the unit each month, and each year, without guarantee the thing will work correctly.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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