14
F83
Inverted flow - water flows through the heater
in the wrong direction
- unit shuts down*
- reinstall the unit
correctly
F99
Heater
disabled
- caused after a power cycle, if a
critical error was previously
present (such as F33, F64, F83)
- unit will not turn on
Note:
* “shut down” means the control board stops applying heat to the heating elements, but the control board and
diagnostic functions remain active
Still having trouble? Please call our Technical Service Department.
6) PERIODIC MAINTENANCE
This heater is designed for many years of carefree use. In order to maintain consistent water flow, it may be
necessary to periodically clean the faucet aerator or the filter screen located in the brass inlet fitting at the
heater.
Heating chamber
Triacs
Energy cut-off (ECO)
Control board
Contactor
ELEMENT CARTRIDGE (pictured below)
INSTALLS INSIDE HEATING CHAMBER
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