23
i. Place limed ends of the heating element in a de-limer solution, designed
for potable water applications, and allow lime to dissolve. Do not allow
de-limer to contact heating element terminals.
g. Other scale removal
i. Silicates, sulfates, and aluminates must be removed by scraping or other
mechanical means. De-limers will not dissolve these types of scale.
h. Flush the cleaned ends of the elements with clean water.
i. Re-install element with new o-ring.
j. Re-attach element wires.
k. Continue until all heating elements are cleaned.
l. Fill the heater following the filling instructions provided in Section II and check
around the elements for leaks.
m. Re-apply power.
5. Check for loose electrical connections. Tighten as necessary.
SECTION IV – TROUBLESHOOTING
ERROR MESSAGES
1. Err, No, Prb
a. This message will flash when the controller does not detect that the probe is
connected to the control board. To clear this error reinsert the probe connector
and press RESET.
2. Err, too, hot, ### (where ### is the actual temperature of the water.)
a. This message will display if the temperature of the water exceeds the high limit
temperature setpoint. To clear this error, wait until the temperature is below the
operating setpoint and press RESET. Note that the unit will not reset until the
indicated temperature is below 195°F. If this message continually occurs, follow
the troubleshooting flow chart for continuous over-temperature condition.
3. Err, No, H2O
a. If this message is displayed, verify that the low water detection is turned off.
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.
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