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Parts List: A.O. Smith GB-750, GW-750; Series 400 / 401 / 402 / 403

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  3. For parts that are not underlined and do not have a link, please Contact Us for price and availability.
  4. The manufacturer has changed some part numbers to a new part number, and we have referenced the new part number in the chart (if applicable). Please note that the manufacturer may change part numbers and availability at any time.
  5. You can download and print the original PDF of the A.O. Smith parts list at the bottom of the page.

 

Item Description GB/GW-750
Series 400/101/402/403
1 Base / Leg Assembly 211874-4
2 Insul. Board - Bottom 211868-4
3 Insul. Board - Side (Right) 211869-1
4 Insul. Board - Side (Left) 211869
5 Insul. Board - Front 211870-4
6 Insul. Board - Rear 211871-4
7A Insul. Board - Top (qty. 2) 211878-4
7B Insul. Board - Top (qty. 2) 211878-7
8 Panel - Front Combustion Chamber 211863-4
9 Panel - Left Combustion 911914-1
10 Panel - Right Combustion 211914
11 Assembly - Control Shelf 211915-4
12 Panel - Rear Combustion Chamber 211861-4
13A Burner Assembly 211941
13B Burner Assembly 211941-14
14 Insert - Side Jacket (qty. 2) 212029
15 User Interface Module 211762
16 Combustion Insert - Left 211853
17 Combustion Insert - Right 211853-1
18 Jacket - Front Right 212027-4
19 Flame Sensor 192682 (new # 9004520215)
20 Ignitor 192334 (new # 9006101205)
21 Jacket - Front Right 212028-4
22 Gasket - Ignitor 210078 (new # 9005933215)
23 Manifold & Piping Assembly 212065
24 Heat Exchanger / Baffle Assembly - Bronze 212069-4
24 Heat Exchanger / Baffle Assembly - Cast Iron 212069-9
25 Baffle - Tube (qty. 7) 192772-11
26 End Baffle Assembly (qty. 2) 210171-16
27 Front Access Panel 192792
28 Gas Train - Series 300, Natural Gas 212061-2
28 Gas Train - Series 301, Propane 212061-3
29 Panel - Top Combustion 211862-4
30 Divider Panel Assembly 211876
31 Transformer 210449
32 Blower / Shutter Assembly 211096-2
33 Gasket (qty. 2) 192780 (new # 192780-000)
34 Gasket - Vent (qty. 4) 192780-5 (no longer available)
35 Fluebox Assembly 211763-2
36 Jacket - Bottom Front 211754-4
37 Jacket - Right Side Panel 211881
38 Jacket - Left Side Panel 212013
39 Jacket - Rear Panel 211885-4
40 Jacket - Top Panel 211884-4
41 Jacket - Top Access Panel 212023-2
42 Gasket - Sight Glass 211866
43 Plate - Sight Glass 210166 (new # 9005836215)
44 Strain Relief Fitting 210173-1
45 Flip Down Panel Assembly 212008
46 Pump/Flow Switch Conduit Assembly 210179-4 (new # 210179-004)
46 Flow Switch Conduit Assembly 210179-3 (new # 210179-003)
47 Inlet Temp. Conduit Assembly 210180 (new # 9005915205)
48 ECO/Outlet Temp. Conduit Assembly 210181 (new # 9005911205)
49 Switch - Rocker 191665 (new # 9004484215)
50 Junction Box 93558 (new # 9005076205)
51 Cover - Junction Box 200660
52 Plate - Intake (qty. 2) 192792
53 Vent Adapter (qty. 2) 192774-3 (no longer available)
54 Gasket - Gas Manifold Plate 211930-1
55 Port - Observation (qty. 2) 191572-1 (new # 191572-001)
56 Gasket - Port 191576-1
57 Gas/Manifold Plate (qty. 2) 211929
58 Grommet 192771-1 (new # 192771-001)
59 Tee - Reducing (Brass) 099985 (new # 099985-000)
59 Tee - Reducing (Galv.) 200644-6 (new # 200644-006)
60 Flow Switch 211480 (new # 9005680205)
61 Gasket - Gas Manifold Plate (qty. 2) 211930 (qty. 1)
62A Nipple - Pipe 1-1/2 in. x 6 in. Brass -----
62A Nipple - Pipe 1-1/2 in. x 6 in. Brass (Galv.) -----
62B Nipple - PIpe 1-1/2 in. x 6 in. Brass 068904-4
62B Nipple - Pipe 1-1/2 in. x 6 in. (Galv.) 200643-8
63 Nipple - Pipe 1-1/2 in. x Close (Brass) -----
63 Nipple - Pipe 1-1/2 in. Close (Galv.) 200641
64 Strain Relief Tube Assembly (qty. 3) 210234
65 Nipple - Pipe 3/4 in. x 3 in. (Brass) 20373-2
65 Nipple - Pipe 3/4 in. x 3 in. (Galv.) 200645 (new # 9005165205)
66 Nipple - Pipe 3/4 in. x Close (Brass) (qty. 2) 020373-32
66 Nipple - Pipe 3/4 in. x Close (Galv.) (qty. 2) 200645 (new # 9005165205)
67 Elbow - 3/4 in. 90 (Brass) (qty. 2) 191664 (new # 191664-000)
67 Elbow - 3/4 in. 90 (Galv.) (qty. 2) 200647-1
68 Pressure Relief Valve (GW model) 98883-3 (new # 098883-003)
69 Pressure Relief Valve (GB model) 210451
70 Strain Relief Fitting 210173 (new # 210173-000)
71 Nut - Locking 210174-1
72 Nut - Locking (qty. 4) 210174
73 Flame Control Board 211759 (new part # 9006521005)
74 Nipple - Pipe 2 in. x Close (Brass) 68904-7
74 Nipple - Pipe 2 in. x Close (Galv.) 200643 (new # 200643-000)
75 Power Distribution Board 211760 211760-000 (new # 9007310005)
76 Tubing - Silicone Rubber (qty. 3) 210209-094
77 Blower Prover Pressure Switch 211094-2
78 Blocked Outlet Pressure Switch 210908 (new # 9006188215)
80 Central Control Board 211758
81 Gas Valve - Natural Gas (750 models only) 191956-2 (new # 9004496205)
81 Gas Valve - Natural Gas 192454-2
81 Gas Valve - Propane (750 models only) 191956-1 (new # 9004495205)
81 Gas Valve - Propane 192454-1 (new # 9004508205)
82 Manual Shut-Off Valve (750 models only) 1181-5
83 Manual Shut-Off Valve -----
84 Feed Header 192767-2 (new # 192767-002)
85 Return Header 192766-1 (new # 192766-001)
86 120V Relay 211546 (new part # 9006612005)
87A Insulation, Fluebox 211909-3
87B Insulation, Fluebox 211909-4
87C Insulation, Fluebox 211909-6
88 Low Gas Pressure Switch - Natural Gas 191149-1 (new # 9003301205)
88 Low Gas Pressure Switch - Propane 191149-3 (new # 9003301205)
89 High Gas Pressure Switch - Natural Gas 192527-1 (new # 9004513215)
89 High Gas Pressure Switch - Propane 192527 (new # 9004512215)
90 Standard Pump (GW models) 210263 (new # 210263-000)
91 Pump Flange (GW models) -----
92 Tank Temperature Kit (GW models) 210324 (new # 9004615215)
93 Communication Harness Assembly 211953-1
94 Burner Gasket 210476 (new # 9005890215) (qty. 15)
95    
96 Screw, 3/4 in. Sheet Metal (qty. 14) 210125-3
97 Fuse - 7.5 AMP 211943
97 Fuse - 3 AMP 211942
98 Jumper (qty. 2) 210491 (new # 210491-000)
99 Orifice - Natural Gas 210880-91 (new # 9005910215) (qty. 15)
99 Orifice - Propane 210880-48 (new # 210880-048) (qty. 15)
NOTES:
- The manufacturer may change part numbers and availability at any time.

 

 

 

 

 

Board Components:

Item Description GW-750 GB-750 LWCO / LO Gas / Hi Gas / IRI/ALARM
101 Harness - Power Line Input - PDB Terminals 212452 212452 -----
102 Flow Switch Harness Assembly - CCB J5 212011 212011 -----
103 Harness - 120 VAC Power PDB J3 to CCB J1 211946 211946 -----
104 Harness 24VAC PDB J2 to CCB J3 & FCB J5 211947-1 211947-1 -----
105 Harness - Transformer - PDB J1 211948 211948 -----
106 Harness - Realy Coil - J2 211949 211949 -----
107 Harness - Gas Valve Relay Power - CCB J6 to FCB 211952 211952 -----
108 Communication Harness Assembly 211953 211953 -----
109 Communication Harness Assembly - CCB J20 & J21 (qty. 2) 211953-1 211953-1 -----
110 Harness Inlet Probe - CCB J8 211954 211954 -----
111 Harness - Outlet/ECO - CCB J7 211955 211955 -----
112 Harness - External Thermostat - CCB J11 211956 211956 -----
113 Wire Assembly (Red) - CCB/FCB 1 J16 211204-245 211204-245 -----
114 Harness - Blower Prover - CCB J17 211959 211959 -----
115 Harness - Gas Valve Output - CCB J19 & FCB J6 211960-2 211960-2 -----
116 Harness - Blower Output - CCB J15 211962-1 211962-1 -----
117 Harness - Pump Relay Contacts - PDB TB1-1 & TB1-3 211963 211963 -----
118 Harness - Gas Valve Output - CCB J19 211960-1 211960-1 -----
119 Harness - Igniter Output - CCB J14 212691 212691 -----
120 Harness - Tank Probe - CCB J14 211989 211989 -----
121 GB Pump Harness - PDB TB1-4,-5,-7 211945-2 211945-2 -----
122 Harness - Switch Inputs - CCB J5 211950 211950 211950
123 Harness - 24 VAC Output - CCB J4 211951 211951 211951
124 Harness - Pump Flow Switch - PCB TB1-4,-7,-5 212012 212012 212012
NOTES:
- The manufacturer may change part numbers and availability at any time.

 

 

Download original AO Smith Parts List
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