Hotspring Tigerriver Watkins Hi-Limit Thermistor Pn 78969 (Old 38416) 1995-2001

Note: Symptom of these parts failing is fluctuating spa temperature even though the temperature setting has not changed. Symptom of this part failing completely is a flashing green "Ready" light on the control panel of a Hot Spring spa model. These screw into the port (hand tight only) marked "inlet" (control T-Stat) and "outlet" (him-Limit) on the PDR replacement heater. Typically, when one thermistor needs replacing the other is close to failing and should be replaced at that same time. Thermistors have a reliable lifespan 6-8 years or so.

Note#2: ALWAYS REPLACE THE THERMISTORS IN PAIRS. If a new thermistor differs in temperature sensing more than five degrees from the old thermistor, the system will go into a "fault mode" and prevent the heater, jet pump(s) and light from operating. So again, when replacing a control thermostat thermistor always replace the high limit thermistor as well and vice versa. Test Procedure 1. Set the meter to 20K on the OHM scale. 2.

Record the temperature of the spa water. 3. Unplug the thermistor from the control box. 4. Meter across the two Thermistor leads. 5. Refer to the Temperature versus Resistance chart in item pics to find the correct resistance value for the temperature measured. If the temperature and resistance does not match that of the chart, this test has failed and the thermistor must be replaced.

Remember if the spa has been inactive, the spa water temperature may be different than the water temperature in the heater housing. DON’T SEE AN ITEM? If you DO NOT see an item that you NEED for your Hot Spring Spa or Jacuzzi Hot Tub -- please EMAIL US! We may just have it and we can quote you a price: Message us! JOIN!

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