Hubbell Electric Heater Company J - Manual (Page 31)

on the T1000 control board. If no voltage is present, replace the control board (T1000). If
voltage is present, check for voltage across the contactor coil. If voltage is present at the
contactor coil, replace the magnetic contactor. If no voltage is present, verify that the
booster heater is wired according to the proper wiring schematic for the unit.
P65 PROBE TROUBLESHOOTING
1. Unplug and reseat the P65 probe wire in the jack on the T1000 control board. Note that
the error message “Err, No, Prb” will be displayed and the reset button must be pressed
to clear the message.
2. If problem persists, unplug the P65 probe from the control board and plug into the RJ45
pigtail (not supplied).
3. If the problem is with temperature control or high limit:
a. Change the configuration to ‘dSt’ to display the actual water temperature.
b. Check the temperature of the water with a thermometer and compare that with the
temperature on the display. If the two temperatures coincide, replace the T1000
control board. If the two temperatures do not coincide, continue to the next step.
c. Unplug the P65 probe from the control board and plug into the RJ45 pigtail (not
supplied). Check the resistance value (ohms) between the blue wire of the pigtail
(#1) and the red wire of the pigtail (#4). Compare the resistance value measure
with the chart below at the measured temperature of the water. If the two values
coincide, replace the T1000 control board. If the two values do not coincide,
replace the P65 sensor
4. If the problem is with low water:
a. Verify that the unit is filled with water.
b. Check for continuity between the yellow wire of the pigtail (#2) and ground. If
continuity exists, replace the T1000 control board. If no continuity exists, replace
the P65 sensor probe.
Thermistor Resistance vs. Temperature
Water Temperature Resistance (±3%)
70°F 11883
Ω
80°F 9299
Ω
90°F 7334
Ω
100°F 5828
Ω
110°F 4664
Ω
120°F 3758
Ω
130°F 3048
Ω
140°F 2488
Ω
150°F 2043
Ω
160°F 1687
Ω
170°F 1400
Ω
180°F 1169
Ω
190°F 980
Ω
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