I have CALIDEC - GEC Manufacturers Part # 7512-1 MX52681 room thermostats. These are now not working reliably. The actual mechanism was apears to be of GEC manufacture. Model # H06286C2 200-250v Terms. 1 & 2, 20A 0.25A Terms. 1 & 3, 10A 0.25A The are only 3 wires used. Red In, Heavier cable ...