Use four NT42S assembly views to distinguish cabinet fittings, electrode and chamber parts, gas-train pieces, and the motor/blower. The original callout references, quantities and descriptions appear directly below each drawing.
Select a linked manufacturer part number for product details and availability. Match the furnace model and any serial-number restrictions before ordering.
1. Cabinet, ducts and wiring
| Reference | Manufacturer part number | Quantity | Component description |
|---|---|---|---|
| 1 | 121711 | 2 | SCREW #8X3.25 PH PH 410SS |
| 2 | 121224 | 6 | SCREW, #10 X 3/4 |
| 3 | 260105 | 1 | VENT CAP, INTAKE |
| 4 | 50296 | 4 | DUCT COLLAR |
| 5 | 121378 | 4 | TINNERMAN U TYPE |
| 6 | 121224 | 4 | SCREW, #10 X 3/4 |
| 7 | 70306 | 1 | GASKET, BOTTOM DUCTING |
| 8 | 100942 | 1 | CABINET FRONT ASSEMBLY |
| 9 | 260178 | 1 | VENT CAP, EXHAUST |
| 10 | 160849 | 1 | THERMOSTAT USE 161154 |
| 10 | 161154 | 1 | THERMOSTAT, WALL (WHITE) |
| 14 | 100944 | 1 | CABINET |
2. Ignition, chamber and exhaust
| Reference | Manufacturer part number | Quantity | Component description |
|---|---|---|---|
| 17 | 121388 | 4 | SCREW, #10 X 1/2 |
| 19 | 120717 | 2 | NUT, HEX # 10-24 KEPS |
| 20 | 121421 | 4 | NUT, 10-24 HEX(THREAD LOCKING) |
| 21 | 30763 | 1 | DOOR,BURNER ACCESS |
| 22 | 70398 | 1 | GASKET, BURNER ACCESS DOOR USE 071076 |
| 22 | 71076 | 1 | BURNER/ELECTRODE GASKET SET USE 72103 |
| 22 | 72103 | 1 | GASKET KIT, BURNER /ELECTRODE |
| 22 | 525011 | 1 | SERVICE KIT, GASKETS BURNER / ELECTRODE |
| 25 | 70163 | 1 | GASKET, ELECTRODE USE 071076 |
| 25 | 71076 | 1 | BURNER/ELECTRODE GASKET SET USE 72103 |
| 25 | 72103 | 1 | GASKET KIT, BURNER /ELECTRODE |
| 25 | 525011 | 1 | SERVICE KIT, GASKETS BURNER / ELECTRODE |
| 26 | 230832 | 1 | ELECTRODE |
| NS | 230790 | 1 | WIRE, ELECTRODE |
| 27 | 121252 | 2 | SCREW 10 X 3/8 PH PH |
| 28 | 230496 | 1 | LIMIT SWITCH 230 DEGREE |
| 29 | 70362 | 1 | BUSHING, SNAP |
| 30 | 121252 | 1 | SCREW 10 X 3/8 PH PH |
| 31 | 121252 | 1 | SCREW 10 X 3/8 PH PH |
| 32 | 121252 | 2 | SCREW 10 X 3/8 PH PH |
| 33 | 121252 | 2 | SCREW 10 X 3/8 PH PH |
| 34 | 230789 | 1 | POWER SUPPLY HARNESS (FEMALE) |
| 35 | 62135 | 1 | BRACKET, POWER SUPPLY |
| 36 | 231000 | 1 | HARNESS, POWER SUPPLY (MALE) |
| 37 | 230625 | 1 | TIME DELAY RELAY |
| 40 | 121357 | 2 | SCREW 6 X 5/8 PH PH |
| 41 | 120198 | 2 | SCREW, #6 X 3/8 |
| 42 | 230714 | 1 | SPLICER |
| 43 | 110422 | 1 | RADIATION SHIELD ASSEMBLY |
| 44 | 20977 | 1 | COMBUSTION CHAMBER |
3. Burner, gas valve and manifold
| Reference | Manufacturer part number | Quantity | Component description |
|---|---|---|---|
| 45 | 62143 | 1 | PLATE COVER, GAS INLET |
| 46 | 70432 | 1 | GASKET, GAS INLET |
| 47 | 170082 | 1 | ELBOW 90 DEG X 3/8 NPT |
| 48 | 170675 | 1 | PIPE, GAS INLET (SHORT) |
| 49 | 70534 | 1 | GASKET DISC COVER |
| 50 | 62408 | 1 | DISC COVER, GAS INLET |
| 51 | 160740 | 1 | VALVE, SHUTOFF |
| 52 | 170671 | 1 | PIP, GAS INLET (LONG) |
| 53 | 170688 | 1 | NIPPLE |
| 54 | 160840 | 1 | VALVE |
| 55 | 170791 | 1 | MANIFOLD ASSEMBLY |
| 56 | 121388 | 6 | SCREW, #10 X 1/2 |
| 57 | 70591 | 1 | GASKET, MANIFOLD |
| 58 | 180215 | 1 | ORIFICE, #54 |
| 59 | 10623 | 1 | BURNER, RIGHT |
| 60 | 10621 | 1 | BURNER, LEFT |
4. Motor, blower and combustion air
| Reference | Manufacturer part number | Quantity | Component description |
|---|---|---|---|
| 61 | 121252 | 4 | SCREW 10 X 3/8 PH PH |
| 62 | 390027 | 2 | RING, BLOWER INLET |
| 63 | 350080 | 1 | WHEEL, ROOM AIR |
| 64 | 390328 | 1 | HOUSING, BLOWER ASSEMBLY |
| 64 | 231646 | 1 | MOTOR - NLA |
| 65 | 121252 | 7 | SCREW 10 X 3/8 PH PH |
| 66 | 121661 | 1 | FASTENER TINNERMAN #2-56 |
| 68 | 70638S | 1 | GASKET, BLOWER HOUSING |
| 69 | 121227 | 2 | SCREW,10-24 X 1/2 |
| 70 | 230509 | 1 | MICRO SWITCH & PADDLE USE 233356 |
| 70 | 233356 | 1 | MICRO SWITCH & PADDLE |
| 70 | 525024 | 1 | SERVICE KIT, SAIL SWITCH |
| 71 | 121247 | 2 | SCREW, 2-56 X 5/8 HEX |
| 72 | 120158 | 11 | SCREW, #8 X 3/8 |
| 73 | 120717 | 3 | NUT, HEX # 10-24 KEPS |
| 74 | 390205 | 1 | COMBUSTION AIR COVER ASSEMBLY |
| 75 | 121252 | 1 | SCREW 10 X 3/8 PH PH |
| 76 | 70570S | 1 | GASKET, COMBUSTION AIR COVER |
| 77 | 121388 | 3 | SCREW, #10 X 1/2 |
| 78 | 70420 | 1 | GASKET, COMBUSTION AIR CROSSOVER |
| 79 | 390329 | 1 | HOUSING, COMBUSTION AIR &MTR CVR ASSM |
| 80 | 70362 | 1 | BUSHING, SNAP |
| 81 | 70406 | 1 | GASKET, COMB. AIR HOUSING |
| 82 | 70571 | 1 | BUSHING,MOTOR MTNG |
| 83 | 61663 | 3 | CLAMP |
| 84 | 230772 | 1 | MOTOR USE 231646 |
| 85 | 62307 | 1 | BRACKET, MOTOR SUPPORT |
| 86 | 120717 | 2 | NUT, HEX # 10-24 KEPS |
| 87 | 350069 | 1 | WHEEL, COMBUSTION AIR USE 350110 |
| 87 | 350110 | 1 | WHEEL COMBUSTION AIR |
| 88 | 70165 | 1 | GASKET, BLOWER MOTOR |
| 89 | 390201 | 1 | HOUSING, BLOWER ASM. RIGHT SIDE |
| 90 | 350079 | 1 | WHEEL, ROOM AIR (CCW ROTATION) |
| 91 | 70494 | 1 | CHANNEL, RUBBER |
| 92 | 62433 | 1 | BRACKET, MODULE BOARD MOUNTING |
| 93 | 70538 | 1 | INSULATOR, MODULE BOARD |
| 94 | 230587 | 1 | MODULE BOARD USE 520741 |
| 94 | 520741 | 1 | MODULE BOARD, WAS SUPERCEEDED BY 520820. USE 521099 |
| 94 | 520820 | 1 | MODULE BOARD, WAS SUPERCEEDED USE 521099 |
| 94 | 521099 | 1 | IGNITION CONTROL MODULE |
| 96 | 121271 | 2 | NUT, #6 32 HEX |
Replacement parts pictured at NewRVParts
The linked product listings correspond to manufacturer numbers shown in the reference tables. Confirm the complete furnace model, applicable serial range and component revision before ordering. Check individual listings for current availability.
Diagram ref 10 · MPN 161154
Suburban 161154 White Heat-Only Mechanical RV Furnace Thermostat
View product and availability
Diagram ref 86 · MPN 120717
Suburban 120717 #10-24 Plastic Hex Replacement Nut
View product and availability
Diagram ref 25 · MPN 525011
Suburban 525011 Furnace Burner & Electrode Gasket Kit | NT/P
View product and availability
Diagram ref 70 · MPN 525024
Suburban 525024 Furnace Sail Switch | Select NT, SF & P-30S
View product and availability
Diagram ref 94 · MPN 521099
Suburban 521099 12V Furnace Fan-Control Ignition Module
View product and availability