MDfish Posted May 10, 2023 Share Posted May 10, 2023 Last October I ordered and began using the 100w Aquarium Co-Op heater. Loved it. This morning it began malfunctioning (I assume) and alternately displaying 73 and EE. I put another thermometer in the water which is reading just over 74. Any thoughts? Thanks! Link to comment Share on other sites More sharing options...
jwcarlson Posted May 10, 2023 Share Posted May 10, 2023 (edited) From the manual: I do not own one of these, however, there's a controller inside there and sometimes that can get squirrelly. I would suggest "rebooting" the heater. Probably unplug it and leave it for 20-30 minutes then plug it back in. Edited May 10, 2023 by jwcarlson 2 Link to comment Share on other sites More sharing options...
nabokovfan87 Posted May 10, 2023 Share Posted May 10, 2023 On 5/10/2023 at 5:18 AM, MDfish said: Last October I ordered and began using the 100w Aquarium Co-Op heater. Loved it. This morning it began malfunctioning (I assume) and alternately displaying 73 and EE. I put another thermometer in the water which is reading just over 74. Any thoughts? Thanks! The first batch of heaters had a discount and would display a code when the heater reached a certain service life. Those details are in this thread. I would reach out to support and try to understand what is going on. Could be a malfunction based on the above chart. 1 Link to comment Share on other sites More sharing options...
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