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Inlet Hi Limit Switch - 42° / 43° / 45° for Astralpool Hurlcon Raypak Heaters - 71030 - HighLimit

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High Limit Switch used in many gas & electric heaters. Common cause of F2 error. Used on almost all pool and spa heaters. Usually found on the Inlet side of a gas pool or spa heater heater.  AKA Thermal Cutout

Failed hi limits cause the F2 Errors found on Hurlcon and Astral Gas Heaters.

Part Number 71030 & others. 

Commonly fail due to condensation and leaks. Should be replaced every few years as part of preventative maintenance. 

Suits all Hurlcon Astralpool HX, MX, Viron, HiNRG, JX Gas Heaters. Also suits Jacuzzi J-HN250C & J-HN400C heaters. Also suits many Raypak heaters and Pentair heaters with Retrofit plugs. 

Suits The Following Heaters:

Hurlcon AstralPool :

HX 70, HX 120, HX 150, MX 150, MX 200, MX 250, MX 300, MX 350, MX 400, MX 500, JX 130, JX 160, HiNRG 175, HiNRG 250, HiNRG 400, Viron 250, Viron 350, Viron 450, Viron 550, WX 70, WX 120, WX 150, ICI 200ICI 400Jacuzzi and many more. 

131 Gemini, Raypak 280, Raypak 350, Raypak 430, and many more.


  • If the heater has a brass plug, make sure it is not leaking. If it is, consider repairing or replacing the part. 
  • Consider a complete Service Pack for your heater
  • This is for the INLET Side of the water connection. Outlet hi-limits are listed below


Other High Limit (Hi Limit) Switches:

42-45C° Inlet Hi Limit (Hurlcon, Astralpool, Raypak, Pentair)

52-55C° Outlet Hi Limit (Hurlcon, Astralpool, Raypak, Pentair)
60C° Outlet Hi Limit AGS (Hurlcon, Astralpool, Raypak, Pentair)
70C° Outlet Hi Limit (Hurlcon, Astralpool)
175C° Flue Temp Sensor (Hurlcon, Astralpool)
Hurlcon / Astralpool HiLimit Locator Brass Threaded Plug


NEW - Service Pack for all MX, HX, HiNRG, Viron Gas Heaters:

Servicing a Hurlcon or Astral pool or spa heater? This is a pack of minimum parts needed for a 3 year service. Save $$$. 
Comes with parts that should be replaced every 3 years on a general Service. Click Here --> Astral Pool & Hurlcon Heater Service Packs


Part Number 71030


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