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Lennox iComfort S30 Smart Thermostat Operating, Troubleshooting And Technical Cheat Sheet page 9

Color touchscreen programmable wi-fi communicating thermostat
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2.2.3. Troubleshooting with Display Removed
Check for 12VDC on Mag-Mount terminals + and -.
2.2.4. HD Display Interface (Electrical) (Do not push on terminals)
S
Ground
S
5-VDC
S
RX
S
TX
S
Sense
Figure 4. Mag-Mount HD Display Contactors
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