1) Rheem -Richmond error 76: communication error with remote, bad remote or failed PC board
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
2) Rheem will send PC board and you can replace yourself
3) Add comment and say what you discover.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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: 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
SOURCE: richmond water heater, goes into lock out
flame sensor error remove and clean with steel wool or replace but becareful because most of them have the ignitor and flame sensor on one bracket and the ignitor is fragile and most important don't touch it the oils from your skin will cause it to burn out
SOURCE: my water heater is leaking
First shut off power then remove acess cover and carefully move insulation out of the way so you can see around elements.Check to see if leak is coming from around element.If it is determine what type of element you have. Either screw in or bolted in. Both have thick rubber gaskets that can be replaced by draing water heater and removing element then install new gasket and reinstall element.
To drain heater shut off valve on incoming cold water supply line ,make sure electric power is off. Connect drain hose to drain valve and put other end to floor drain or sump basin.You can open faucet on hot side near by to prevent vacumn and drain. If you have screw in type disconnect wires,marking them for reattachment,then use large open end wrench or pipe wrench on hex section of element and turn to left to remove. If you have bolt in element spray bolts with wd-40 or similar and carefully loosen bolts then disconnect wires and remove element.install new gasket and reverse to reinstall. I would recommend that you replace elements at this time if you are sure this was the source of the leak.
If you don't think it's leaking around elements then check fitting on both water lines to water heater to be sure they are not leaking and seeping down thru insulation and leaking out of the bottom of heater. Next check around drain valve for leak and if it's leaking you can try tightening it a little or replace it with 3/4 x2 brass nipple and 3/4 inch female iron pipe boiler drain. Use teflon tape or pipe joint compound on all threaded connections.
After you have eliminated all other sources for leak then it is probably the tank itself. If it is less then six years old the tank should still be covered under warrenty. Most warrenties will give you a new heater but installation will not be covered unless you have extended service coverage.
I hope this helps you some. Thank you
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