Hubbell ETXA Series, Description, Installation And Operation Manual, Page: 35 / 52

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Advanced Troubleshooting:
WARNING: SERIOUS BODILY INJURY OR DEATH MAY OCCUR IF
THE FOLLOWING WARNINGS ARE INGNORED.
•
This following portion of this section is intended for use by a QUALIFIED
ELECTRICIAN.
•
All circuit breakers and the service disconnect must be turned off before the opening
the doors of the unit.
•
Hubbell Water heaters provides technical assistance Monday - Friday,
8:00am – 5:00pm EST (203) 378-2659 or 800-647-3165.
This troubleshooting section will cover all the points that need to be checked from an
electrical standpoint to ensure that the Hubbell tankless water heater is working correctly
and to determine which component may need to be replaced.
Tools Required:
•
Phillips screwdriver
•
Flat blade screwdriver
•
Clamp multi-meter able to read voltage and amperage (amperage readings require a
clamp type meter).
•
Thermometer
Pre-Operational Procedures:
1. With power to the unit turned ON, verify that the configuration settings are correct in
accordance with the configuration code sticker on the inside of the door or use
Temperature Controller User Interface Instructions in Section IV.
2. TURN OFF POWER BY MEANS OF DISCONNECT.
3. Open front door(s).
4. Verify that the main power feed is properly connected to the power distribution block
or magnetic contactor, as applicable.
5. Verify all connections are tight.
Check the Power Supply to the Unit:
1. Wearing proper P.P.E., turn on power to the unit by means of disconnect.
2. Check the incoming voltage between each phase at the line side of the power
distribution block or magnetic contactor, as applicable.
3. If no voltage is present between all phases, verify that the circuit breakers at the
main panel and/or disconnect means on have been turned on.
4. If the circuit breakers are on and there is still no voltage present or if the incorrect
voltage or no voltage is present between any of the phases, contact an electrician to
troubleshoot the electrical feed.
5. If all voltage readings are acceptable, proceed to Check the Transformer.
Check the Transformer:
1. The transformer is utilized on units with supply voltages above 240 volts to supply a
reduced voltage capable of powering the temperature controller.
2. If the display is lit or the unit is not equipped with a transformer (208 and 240 volt
units), proceed to Check the Hi-Limit Thermostats.
3. Check the voltage on the primary side of the transformer.
4. If there is no voltage present, check the wiring and connections to the primary side of
the transformer from the power distribution block or magnetic contactor, as
applicable.
5. Check the voltage on the secondary side of the transformer.
6. If the secondary voltage does not conform to the table below, replace the transformer.
7. If all voltage readings are acceptable, proceed to Check the Hi-Limit Thermostats.