Bought a heater for my 100 gallon tank and set the temp to 81 degrees. The thermometer on the unit will usually read 3-4 degrees below this, often with a "green" light indicating the temperature is normal. Now it flashes regularly and the temperature shows 88 degrees on the block, but wrong. The tank gets colder instead of warmer, so it doesn't work. Disconnected, waited, reconnected, same problem. Not worth the money I spent.
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