Service Manual

3 Troubleshooting

Checking temperature sensors

The water heater temperature sensors (inlet water, outlet water, system water, and flue) are all resistance type devices. The following tables show 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 its corresponding table, replace the sensor.

Table 3B - Inlet/Outlet and Tank Sensor Resistance vs. Temperature

 

Temperature

Resistance

Temperature

Resistance

 

 

 

 

 

 

 

 

50

 

18,780

 

158

1,990

 

 

 

 

 

 

 

 

68

 

12,263

 

176

1,458

 

86

 

8,194

 

194

1,084

 

104

 

5,592

 

212

817

 

 

 

 

 

 

 

 

122

 

3,893

 

--

--

 

 

 

 

 

 

 

 

140

 

2,760

 

--

--

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3C - Flue Temperature Sensor Resistance vs. Temperature

 

 

 

 

 

 

 

 

 

Temperature

 

Resistance

 

Temperature

Resistance

 

 

 

 

 

 

 

 

68

 

14,773

 

176

1,707

 

 

 

 

 

 

 

 

86

 

9,804

 

194

1,266

 

 

 

 

 

 

 

 

104

 

6,652

 

212

952

 

 

 

 

 

 

 

 

122

 

4,607

 

230

726

 

 

 

 

 

 

 

 

140

 

3,252

 

248

560

 

 

 

 

 

 

 

 

158

 

2,337

 

--

--

 

 

 

 

 

 

 

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Lochinvar 1.3, 1.5 service manual Checking temperature sensors, Temperature Resistance

1.5, 1.3, 1 specifications

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