This is a "manual hot" error. If you select Type K thermocouple in the settings but wire a Type J, the controller will read the wrong voltage. It will think the system is cold when it is actually boiling.
Based on general instructions for similar Thermotech PID controllers, follow these safety protocols: Environment: thermotech tt91 manual hot
In the modern home, comfort isn’t a luxury—it’s the backbone of good living. Whether you’re hosting a movie night, enjoying a quiet morning with coffee, or winding down for an evening of gaming, the right temperature sets the mood. The programmable thermostat puts that control in your hands. But without a clear understanding of its features, you’re missing half the benefit. Let’s bridge the gap between manual settings and seamless living. This is a "manual hot" error