High Limit Switches used on Astralpool / Hurlcon Viron & ICI (B) gas heaters after 2012, and after the recall work was carried out. 

Suits most post-recall Viron 250, Viron 350, Viron 450, ICI 200, ICI 400, and B-series variants of the ICI & Viron heaters.

One is found on top of the firebox, near the combustion fan, and the other is found on the flue tube inside the heater.

Important Information:

- These are an Extremely Important Safety feature found on heaters. They must be replaced when necessary. Proper diagnosis as to why the limits are tripping or have failed is extremely important.