If your Rheem tankless water heater won’t turn on, be sure a faulty power supply is the root reason that you need to first concentrate on. To overcome this issue, first up, verify whether the circuit breaker isn’t tripped or the heater has blown the fuse.
If so, simply reset the tripped breaker and replace the blown fuse to get back the heater into normal operation.
If the problem persists, check whether your heater is getting adequate voltage to turn on. Generally, in the case of the Rheem tankless water heater, it requires up to 120 VAC/60 Hz power supply to operate properly. Measure the voltage going through your heater and if needed, connect your appliance to another functioning wall outlet.
At times, that’s not all to resolve the issue. Other major reasons for this issue include:
The Heater Is in Maintenance Mode
If your heater is in maintenance mode, fix it by holding down the Up and Down arrow at the same time. Then, activate the unit through the power button.
Faulty Gas Supply
If you have a Rheem gas tankless water heater, you need to make sure of a fluent fuel supply to the unit. Otherwise, it won't turn on. For instance, inspect the LP tank for the fuel amount and refill it if needed.
Failed PCB Controller
As the PCB is the brain of the heater, if it fails, your unit will stop functioning at all. So, you need to inspect this major element as well to figure out whether it is in perfect working order or not.
System Overload
Last but not least, check whether you are running too many hot water fixtures at a time that has crossed its limit. If so, turn off the extra fixtures and reset your water heater. Then try to turn on the heater manually.
Hope that you're successful this time!

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