Re: Hydrofarm Thermostat help.
This is what I found on the Hydrofarm website. Hope it helps.
Q: What do the error codes mean on my Heat Mat Thermostat?
A: E1: temperature is below the low limit. Or the temperature sensor has an open circuit. E2: the temperature sensor has a short circuit. E3: temperature is above the high limit. To reset the MTPRTC: Unplug the unit and then while pressing the set button, plug the unit back in.
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