UNI boiler replacement parts:
1 Controller Tronic 83
2 Fan
3 Sensor CT4 for boiler and domestic hot water
4 Sensor CT2 for exhaust and outdoor
5 DZT-1 Thermal sensor, Open: 185°F/85°C, Close: 140°F/60°C
6 DZT-2 Thermal sensor, Open: 200°F/95°C, Close: 155°F/70°C
7 Fuse pack (5)
8 Relay 230VAC (use to start a 120V pump)