{"product_id":"high-temperature-limit-switch","title":"Coates High Temperature Limit Switch","description":"\u003cp\u003eCoates 22003820 is the high temperature limit switch used on Coates electric pool and spa heaters. It is the overtemperature safety device, not the operating thermostat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat it is for\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAn electric heater puts a great deal of energy into a small volume of water. If flow drops or the control fails, that water can climb far past the set point. The limit switch is the independent cutout that opens under those conditions and takes the heater offline before anything is damaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen to replace it\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTwo symptoms point here. A heater that trips off repeatedly for no obvious reason can have a limit switch that has drifted and now opens early. A heater that will not start at all can have one that has failed open. Before changing it, confirm the heater actually has good flow, because genuine low flow will trip a perfectly healthy switch and the switch is doing its job when it does.\u003c\/p\u003e","brand":"Coates Heater","offers":[{"title":"Default Title","offer_id":48628806353108,"sku":"CHC-151-7588","price":87.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_0d118097-cb46-4338-926c-56b8a8f937a4.jpg?v=1788751888","url":"https:\/\/www.activepoolsupply.com\/products\/high-temperature-limit-switch","provider":"Active Pool Supply","version":"1.0","type":"link"}