Hubbell Electric Heater Company J - Manual (Page 27)

27
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.
7. HLd
a. This message indicates that the 24-volt interlock feature is enabled, there is no
24-volt signal present, and the heater is in standby mode. If it is not the intention
to operate the heater with the 24-volt interlock feature, this feature should be
disabled as shown in the controller operation section. (Only available with r23 or
later software).
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.
DISPLAY BUTTONS
1. If the display randomly changes or does not respond when the buttons are pressed,
loosen the four (4) screws holding the display to the base, reseat the display in the
center of the opening, and re-tighten the screws.
MISCELLANEOUS
2. 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.
3. 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.