Exploded parts diagram: This part is shown on the Jacuzzi J-HN250C/400C LoNox Natural Gas Heater exploded parts diagram.
🔧 Jacuzzi J-HN250C/400C LoNox Natural Gas Heater – exploded parts diagram

The numbered parts below make up this assembly. Parts we stock are linked – click any to view.
| No. | Part |
|---|---|
| – | 677539 |
| – | JCZ J-HN250C AIR COMB BLOWER |
| – | J-HN250C/J-HN400C Components Bag |
| – | Sensor, Jacuzzi, HN250C/400C ◀ this part |
| – | JCZ IGNITION SENSOR LEAD J-HN |
| – | 677682 |
| – | 677681 |
| 35 | 46-105-W001K35 |
| 34 | JCZ IN/OUT HEADER J-HN SERIES |
| 33 | JCZ PRESSURE SWITCH J-HN |
| 32 | Hi-Limit, Jacuzzi, HN250C/400C, 130F |
| 31 | 677530 |
| 30 | 46-105-W001K30 |
| 29 | 46-105-W001K29 |
| 28 | COMBUSTION FAN ASSEMBLY |
| 27 | 677668 |
| 26 | 46-105-W001K26 |
| 25 | 46-105-W001K25 |
| 24 | Hot Surface Ignitor, Jacuzzi, HN250C/400C |
| 23 | 46-105-W001K23 |
| 22 | 46-105-W001K22 |
| 21 | 677658 |
| 20 | 677657 |
| 19 | 46-105-W001K19 |
| 18 | 46-105-W001K18 |
| 17 | JCZ GAS VALVE J-HN SERIES |
| 16 | JCZ AIR PRESSURE SWITCH J-HN |
| 15 | Ignition Module, Jacuzzi, HN250C/400C |
| 14 | PCB, Jacuuzi, HN250C/400C |
| 13 | LENS BADGE |
| 12 | Transformer, Jacuzzi, HN250C/400C |
| 11 | HEATER FACIA LABEL |
| 10 | 46-105-W001K10 |
| 9 | FLAME ROD WITH SIGHT GLASS KIT |
| 8 | 677642 |
| 7 | JCZ GASKT TUBE SEALS 9 PK J-HN |
| 6 | JCZ RETURN HEADER J-HN SERIES |
| 5 | 46-105-W001K5 |
| 4 | 46-105-W001K4 |
| 3 | 46-105-W001K3 |
| 2 | 677634 |
| 1 | 677633 |
🔧 Exploded diagram and parts
This part belongs to the Jacuzzi J-HN250C/400C LoNox Natural Gas Heater assembly. Everything listed below is something we stock for it, and the numbers match the diagram.
| No. | Part | Our part number | Availability | |
|---|---|---|---|---|
| 7 | ![]() |
JCZ GASKT TUBE SEALS 9 PK J-HN | 76121 | 3 in stock |
| 9 | ![]() |
FLAME ROD WITH SIGHT GLASS KIT | 77140 | 13 in stock |
| 12 | ![]() |
Transformer, Jacuzzi, HN250C/400C | 72056 | 9 in stock |
| 14 | ![]() |
PCB, Jacuuzi, HN250C/400C | 726142 | 43 in stock |
| 15 | ![]() |
Ignition Module, Jacuzzi, HN250C/400C | 726156 | 21 in stock |
| 24 | ![]() |
Hot Surface Ignitor, Jacuzzi, HN250C/400C | 726158 | Available to order |
| 28 | ![]() |
COMBUSTION FAN ASSEMBLY | 726127 | 6 in stock |
| 32 | ![]() |
Hi-Limit, Jacuzzi, HN250C/400C, 130F | 71035 | 14 in stock |
| 33 | ![]() |
JCZ PRESSURE SWITCH J-HN | 71580 | 4 in stock |
| 34 | ![]() |
JCZ IN/OUT HEADER J-HN SERIES | 726054PRV | 1 in stock |
![]() |
JCZ J-HN250C AIR COMB BLOWER | 78132 | 1 in stock |
















