User Manual

27
a. This message will display if the temperature of the water exceeds the high limit
tem
perature setpoint. To clear this error, wait until the temp
erature is below the
operating setpoint and press RESET. Note that the unit will not reset until the
indicated tem
perature is below 195°F. If this me
ssage continually occurs, follow
the troubleshooting flow chart for continuous over-temperature condition.
3. Err
, No, H2O
a. This message will display when the wa
ter level in the tank has dropped below
the sensor probe. To clear this m
essage,
refill the tank. If the low water reset is
set for automatic, the 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 determ
ines there is water in
the base of the heater shell. To clear this m
essage, remove the water from
the
leak detection sensor. Check the unit and piping for leaks.
5. CC
a. This m
essage displays if the display cab
le is installed into the control board
backwards. To clear this message, remove and correctly install the display cable.
6. 255
a. This m
essage 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 m
essage indicates that the 24-volt in
terlock 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 rem
oved 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, leaving the screws loose.
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 recomme
nded that
the power supply to the booster heater be
turned off at the ma
in 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.