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Replacement Seisco Temperature Sensor
Temperature Sensor with Seal, 10k ohm thermistor. Fits all Seisco RA and SH units.
(all 2 chamber Seisco units TH-IN, TH-1, TH-2)
(all 4 chamber Seisco units TH-IN, TH-1, TH-2, TH-3, TH-4)
TEMPERATURE SENSOR RESISTANCE CHECK
Temperature sensors that have been damaged, failed or over time are simply not reading correctly can greatly affect the performance of the heater. Heaters manufactured in the last 10 years use 10K Ohm resistors. These sensors will have white or black wires and will give you readings from 8,000 to 15,000 ohms. If your readings are not in this range, check your meter settings. Once your meter is set correctly, proceed to testing. If your heater has red and green wires on the sensors, consider replacement of the entire unit.
ALL POWER MUST BE TURNED OFF BEFORE DOING THIS RESISTANCE CHECK.
CHECKING THE SENSOR WIRES 1. First, check the sensor wires by performing a Continuity Test to verify they are not defective. Replace any bad sensor wires before proceeding with the following sensor checks: 2. TEMPERATURE SENSOR RESISTANCE CHECK 3. With the power off open a hot water valve and run cold water through the heater for 5 minutes (on SH models, activate the pump). 4. Note: The goal is for all sensors to be reading the same temperature when testing. If one of the sensors varies by more than 10% when measured, it should be replaced. If the heater is more than 5 years old, replacement of all sensors is recommended.
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