Kit #1 has a single sense electrode (one wire to the electrode, applicable to S/N above 920500001), Kit #2 has a dual sense electrode (two wires to the electrode, applicable to S/N below 920500001)
Tune-Up Kit #1 Contents (links in blue):
Tune-Up Kit #2 Contents (links in blue):
Click The Down Button To View NT-30S Exploded Parts View Links
*Not Shown* Duct Cover (link): 050733
Item# 3 Bottom Duct Gasket 062164
Item# 6 Duct Collar (link): 050715
Item# 7 White Thermostat (link): 161154
Item# 7 Black Thermostat (link): 161210
Item# 8 Power Supply Harness, Outside Plug, (link): 520322
*Not Shown* Power Supply Harness, Inside Socket, (link): 520323
Item# 10 Electrode, Single Sense, Above S/N 920500001,(link): 231933 (New P# 525029)
Item# 10 Electrode, Dual Sense, Below S/N 920500001, (link): 230956 (New P# 525019)
*Not Shown* Ignition Lead (link): 232456
Item# 13 Electrode / Burner Access Door Gasket Kit (link): 071076 (New P# 525011)
Item# 18 Electrode / Burner Access Door Gasket Kit (link): 071076 (New P# 525011)
Item# 21 Limit Switch (link): 230496
Item# 35 Module Board (Ignition Board) (link): 521099
Item# 38 Module Board Insulator 070538
Item# 40 Time Delay Relay (link): 48000
Item# 42 Vent Cap & Exhaust Tube (link): 260573
Item# 43 Intake Tube, 3 Inch (link): 050906
Item# 48 Burner Assembly (link): 010701
Item# 49 Orifice (link): 180214
Item# 50 Manifold Gasket (link): 070408
Item# 52 Manifold (link): 171468
Item# 53 Gas Valve (link): 161123
Item# 61 Room Air Blower Wheel (link): 350113
Item# 65 Sail Switch (link): 230509 (New P# 233356)
Item# 70 Motor Mount Bracket 062138 obsolete / no longer available
Item# 72 Crossover Tube Gasket (link): 070385
Item# 75 OEM Motor, 12VDC (link): 521137
Item# 75 After-Market Motor, 12VDC (link): 231207MC (New P# 521137MC)
Item# 76 Motor Gasket (link): 070384
Item# 79 Combustion Air Wheel (link): 350110
Item# 81 Combustion Air Housing Gasket (link): 070386
*Not Shown* Fan Switch (link): 230575