Finnex Max-300 Troubleshooting - The Planted Tank Forum
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post #1 of 5 (permalink) Old 04-17-2014, 02:34 AM Thread Starter
Algae Grower
Join Date: Aug 2013
Location: Syracuse, NY
Posts: 12
Finnex Max-300 Troubleshooting


I own a Finnex Max-300 Temperature Controller. Purchased February 12, 2014. I'm having trouble with it all of a sudden.

When I plug my Hydor inline heater directly into the power outlet, it works fine, the red light on the heater itself turns on indicating that it's heating the water.

When I plug the heater into the Finnex Max-300 and turn the Max-300 on, the red light on my heater turns on for a half second and them immediately turns off. Meanwhile, the Finnex Max-300 has both green and red lights on, indicating that it is allowing power to reach the heater. But it isn't because the Hydor's light isn't on.

When I attempt to change the temperature setting by pressing the on/off/set button, it blinks "88" one to three times (and beeps with each blink) and returns to the current temperature reading, not allowing me to modify the setting.

Any ideas what's wrong and/or how to fix it?

Last edited by gildedrain; 04-17-2014 at 02:52 AM. Reason: added info, forgot about the beeps
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post #2 of 5 (permalink) Old 04-17-2014, 03:37 PM
Lowe's Avatar
Join Date: Nov 2011
Location: Chicago
Posts: 749
Ooh, shoot our tech an email and he can troubleshoot it for you. Via, there is a support tab on the left. It goes straight to him and he'll be able to get to you today.

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post #3 of 5 (permalink) Old 04-17-2014, 03:40 PM Thread Starter
Algae Grower
Join Date: Aug 2013
Location: Syracuse, NY
Posts: 12
D'oh! I was on your site last night and didn't see the support tab. The contact form wasn't working, so I came here, knowing that you regularly check this site. Thanks!
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post #4 of 5 (permalink) Old 01-14-2015, 09:39 PM
Algae Grower
Join Date: Oct 2014
Location: Hammond, LA
Posts: 9
Did they resolve your problem? If so what was the issue?
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post #5 of 5 (permalink) Old 01-15-2015, 04:00 AM Thread Starter
Algae Grower
Join Date: Aug 2013
Location: Syracuse, NY
Posts: 12
They had me ship the faulty thermostat back to them. They inspected it and found it to have a faulty circuit board or something. They sent me a brand new one and it's been working fine.
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