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Snap Disc Thermostat Continuity Test

When customer’s contact us about troubleshooting a snap disc thermostat that is found in a piece of their equipment one of the first things we ask the customer is if they tested the snap disc’s continuity. This will tell us if the high limit has been reached, and it’s simple! Give us a call for for more information or visit our online store to purchase.

  1. Unplug the equipment from incoming power
  2. Remove wires from the thermostat
  3. Run a continuity test across the terminals
    1. If the tester’s light doesn’t turn on the switch’s circuit is open and the high limit has been reached and the thermostat needs to be reset.
    2. If the tester’s light does turn on the switch’s circuit is closed and the limit has not been reached. Please be sure the system’s temperature reached the high limit, and if problem still occurs, click here to contact us.

Give us a call for for more information or visit our online store to purchase.

Resetting the snap disc thermostat depends on the type of thermostat.

If it’s an automatic reset thermostat switch, bring the temperature in the system back to normal to reset the switch. Automatic reset temperature switches have a set opening and closing temperature. For example, if a switch opens at 125°F and closes at 105°F, then you would need to bring the temperature in your system down to 105°F or below to get the switch to reset.

If it’s a manual reset thermostat switch, press the red button found on the thermostat switch to reset. Manual reset thermostat switches will not reset by themselves, and require human intervention to reset.

Loose Mount Manual Reset
A manual reset temperature switch

If it’s a one shot thermostat switch, the switch needs to be replaced. Click here to contact us. For more information about our switches, take a look at our catalog.

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