The Lennox 89K24 Control Board - Tdsi 3 receives and interprets signals from the thermostat, adjusting important settings within the HVAC unit to match the operational mode and desired temperatures.
Real OEM controls protect your piece of equipment from damage due to malfunctions or inefficiencies caused by incompatible parts
Fits popular HM30-150-05, CB21-65-01, HM30-100-01 units and more (see FITS MODELS below for complete list)