error will clear. If the low water reset is set for manual, when the tank is full press RESET. Check the heater and the piping for leaks. Check for mineral buildup on the probe and clean as required. Check for continuity between the yellow wire and ground. See diagram 2 on the following page.
4.Err, H2O, LEA
a.This message displays if the leak detection sensor determines there is water in the base of the heater shell. To clear this message, remove the water from the leak detection sensor. Check the unit and piping for leaks.
5.CC
a.This message displays if the display cable is installed into the control board backwards. To clear this message, remove and correctly install the display cable.
6.255
a.This message indicates that the probe is likely out of calibration. To clear this message, it is recommended that the probe be removed and replaced.
CONTACTOR CARE
1.A chattering or humming from the contactor is due to dust or debris on the contact points that prevents the contactor from making proper contact. The debris can be removed by utilizing a can of antistatic cleaning and dusting spray (pressurized air) and spraying through the side of the contactor to remove the debris.
MISCELLANEOUS
1.If the display flashes when the unit is first turned on or turned on after maintenance, check that the J5 terminal on the controller is engaging all four pins on the board.
2.Note that before replacing the control board, display, or probe, it is recommended that the power supply to the booster heater be turned off at the main circuit breaker disconnect to the booster heater to reset and clear the electronic controller.
CAUTION: Do not use plumber’s tape/Teflon tape/pipe dope when installing the probe. Tape will prevent the low water detection system from operating properly and will cause false low water errors. Lubricate O- ring prior to installation.
Tighten probe at the brass hex flats only. Use a 13/16” open ended socket or spark plug wrench. Do not apply pressure, twist, or turn the black wire or the stainless steel jam nut, as this will damage the probe.
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