Water temp low

radkison

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I have a 175 gallon system and am using a hygger hg102 heater. It’s kept the temp perfect for 4 weeks now but last night I noticed the temp dropped to 73. It’s not rising. There’s no error codes and the heater display is on like everything is working properly. I placed a smaller backup heater in and have it up to 75. Inspected the hygger and nothing seems off about it.
20260814_080955_585E5FB8-6123-48BC-85F8-D92BD02C4DA7.png
 
I have a 175 gallon system and am using a hygger hg102 heater. It’s kept the temp perfect for 4 weeks now but last night I noticed the temp dropped to 73. It’s not rising. There’s no error codes and the heater display is on like everything is working properly. I placed a smaller backup heater in and have it up to 75. Inspected the hygger and nothing seems off about it.
20260814_080955_585E5FB8-6123-48BC-85F8-D92BD02C4DA7.png
20260814_081048_AF6EE21D-8E1C-4AB8-84C5-1A75B6F4D8DC.png
 
Is the heater itself only 4 weeks old?
 
Is the heater getting hot? I just hold them in my hand to make sure they are actually heating even if the controller shows it is. Could be a defective heater. I always keep several heaters and a controller or two laying around. Heater failures are quite common. Good thing is that temp isn't low enough to hurt anything and low is much better than too high.
 

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