Our new HTEC-510 model has a degasser LED that only illuminates when it is not working properly.    It now works as a warning light that flashes red when there is a problem.  Our old HTEC-500 model had a green light that indicated it was functioning properly.  

However, the degasser LED may not indicate an error in some cases even when it is not working properly. To check if the degasser is working, please turn on the system power and listen for the noise of the degasser vacuum pump (buzzing noise). If the noise stops with in 3 min from system power on and then the restarts in ~3-5 min, it is normal.  If the noise doesn’t kick back on over 5 minutes, the degasser may require repair.  Please contact Amuza for further evaluation.