Checking Temperature Sensors - Lochinvar EnergyRite ER152 Service Manual

3
Troubleshooting

Checking temperature sensors

The pool heater temperature sensors (inlet and outlet water) are both resistance type devices. The following table shows the
correct values for the sensors at various temperatures. Use an ohmmeter to read the resistance of the sensor at a known
temperature. If the resistance of the sensor does not closely match, replace the sensor.
Table 3B Inlet/Outlet System Sensor Resistance vs. Temperature
Temperature
(continued)
50
68
86
104
122
140
Service Manual
Resistance
18,780
12,263
8,194
5,592
3,893
2,760
23