On the covered Rheem tankless gas water heater, 82 means error: a control board program chip malfunction. First, turn the water heater off and unplug it for about 30 seconds. Then: Rheem's pocket manual lists this as a control board fault for a technician. If the code returns after the restart, note it and call for service rather than opening the unit.
Try in this order
0 of 11 completedWhat to do first
ReversibleTurn the water heater off and unplug it for about 30 seconds.
Correct only the documented fault domain
ReversibleRheem's pocket manual lists this as a control board fault for a technician. If the code returns after the restart, note it and call for service rather than opening the unit.
Check the program chip
ReversibleCode 82 is a gas type control data failure: the circuit board has lost its programming, was never programmed or has failed. Confirm the program chip is on the board and set for the gas the unit burns, natural gas or propane.
Restart the unit once
ReversibleTurn off the faucet and the water heater, unplug it for about 30 seconds, plug it back in and run a hot tap to see whether the code clears.
Check the power supply
ReversibleA power surge or an unstable outlet can upset the control board, so make sure the heater is on a proper grounded outlet and not a loose adapter.
Call for service if it returns
ReversibleRheem lists code 82 as a control board fault for a technician, so a code that comes straight back needs a service visit rather than more resets.
Turn the heater off
ReversibleUse the controller to turn the water heater off. Code 82 is a control board program chip malfunction, which Rheem's pocket manual lists as a fault for a technician. Write down the code and the time.
Unplug it for thirty seconds
ReversibleRheem's first step is to turn the heater off and unplug it for about thirty seconds, then plug it in and turn it on. This restarts the control and can clear a one-off error.
Do not open the unit
ReversibleThe program chip is on the control board, inside the heater, with line voltage and gas parts nearby. If the code returns after the restart, note it and call for service rather than opening the unit.
Have the board checked or replaced
ReversibleA technician can confirm the fault, check for loose connectors and replace the board or the chip. Ask for the part number and a warranty on it.
Use another source of hot water meanwhile
ReversibleHeat water on the stove for washing, and do not use a gas appliance in a way it was not designed for. A heater with a board fault should stay off until it is repaired.
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Exact questions
Common questions about “Rheem tankless gas water heater code 82”
What does 82 mean on a Rheem tankless gas water heater?+
Error: a control board program chip malfunction.
Can code 82 mean the wrong gas type is set?+
Yes. The control board must be programmed for natural gas or propane; a missing chip or a mismatch shows code 82.
Is Rheem code 82 a gas problem?+
It is a data fault on the control board about the gas type programming. The board must be set to natural gas or propane, and a service technician checks that.
Can I replace the program chip myself?+
No. Rheem treats it as a control board fault for a technician, and opening a gas water heater yourself can be unsafe.
Is code 82 caused by a power surge?+
It can follow one, which is why a single restart is worth trying. A repeat code means the board needs to be checked.
Will unplugging fix it?+
It may clear a one-off, but a code that returns needs service.
Is this an owner repair?+
No, it is a control board fault for a technician.
Is the heater safe to use meanwhile?+
Leave it off until it is repaired.