The TT91 internal relay is rated for 3A resistive. If you are switching a contactor, a heater cartridge, or a solenoid valve that draws 5A+ inrush, the relay contacts will arc.
: The unit includes sensor break protection, which can automatically switch the output off if a sensor fails. Addressing Temperature Overruns ("Hot" Issues) thermotech tt91 manual hot
Maya turned the dial. A soft green light glowed. The LCD read: . The TT91 internal relay is rated for 3A resistive
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If the drywall is warm, the problem is in the wiring. Turn off HVAC power at the breaker. Remove the TT91 faceplate. Inspect the terminal screws (R, W, Y, G, C). Look for:
Inside the control box, there are typically or Jumpers that allow the installer to configure the system to the specific spa environment: