Hubbell HD - Page 25

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Symptom Probable Cause Corrective Action
Temperature and
pressure relief valve
opens and/or high
limit temperature
error occurs.
Unit is overheating due
to improper P65SS
probe calibration.
See the ‘P65SS Probe Troubleshooting’
section.
Unit is overheating due
to the magnetic
contactor staying in the
closed position.
See the ‘Magnetic Contactor Troubleshooting’
section.
Water at the outlet
is not the proper
temperature.
Gauge(s) not reading
correctly.
Check the temperature of the water with a
thermometer to verify the gauges are working
properly. Replace gauges, if required.
Temperature setpoint
too low.
Adjust the temperature setpoint.
Water heater piping to
point of use is not
insulated.
If there is more than 5 linear feet of piping
between the heater and the process, the piping
should be wrapped in insulation or a
recirculating system should be installed.
Bypass valve (if
installed) is open or
allowing water to pass
when closed.
Verify that the bypass valve between the hot
and cold water lines is closed. If condition
continues, replace the bypass valve.
Water heater does
not heat at all.
Main supply circuit
breaker tripped.
Check and/or reset the circuit breaker.
Water heater circuit
breaker tripped.
If unit is supplied with a circuit breaker, check
and/or reset the circuit breaker.
Heater in high limit. If a high limit error occurs, allow water to cool
and press the reset button. If error continues
see symptom “Temperature and pressure relief
valve opens and/or high limit temperature
error occurs”.
Low water error. Verify that the low water setting is set to OFF
in the configuration. If error is still present
replace the P65SS probe and/or T1000
controller.
Magnetic contactor
does not energize.
See the ‘Magnetic Contactor Troubleshooting’
section.
No power to control
board (T1000) or
display (TD1000) not
lit.
Reseat the display (TD1000) ribbon cable in
the control board (T1000) connector. If the
display is still not lit, see the ‘Control Board
(T1000) / Display (TD1000) Troubleshooting’
section.
Element Failure. Disconnect the wires from each element and
verify that the resistance (ohms) value for each
element is correct. Replace elements as
required.
No Water in Tank. With power off, check for continuity at the
float type low water cut-off leads. If water is
present and there is no continuity, replace the
float type low water cut-off.
Incorrect Configuration
Settings
Verify and correct configuration settings as
required.