Tuesday 27 July 2021

New Raypak LP heater issue. high limit fault

Just installed my new heater. It keeps tripping the high limit 2 switch. I think it’s a 135 degree trip. I put a thermocouple on that switch and noticed that if the side cover is off, it runs 120 - 128 degrees. If I put the cover back on it runs 127 - 137 degrees and trips. Why would it run so hot. I think the switch just to the left of it is the higher temp switch and that area runs much cooler. Are they installed wrong or is it an issue with the governor? Pics below. Temp with cover...

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