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Parts List: A.O. Smith GDHE-50, Series 120/121

  • Links are included to the parts that are available to be purchased.
  • Parts that are not listed in the chart are either discontinued by AO Smith or are not available for purchase.
  • The item number in the first column corresponds to the location of the part in the line art drawing below the chart.

 

Item Description
GDHE-50
Series 120/121
1 Display Circuit Board 9006240005 (new # 100111017)
2 Power Switch 9005980205 (new # 100110788)
3 Plastic Top 9005977205 (new # 100110786)
4 Plastic Enclosure 9006413005 (new # 100111175)
NOTES:
- The manufacturer may change part numbers and availability at any time.

 

 

Top Cover Control Assembly:

Item Description
GDHE-50
120 / 121 Series
1 CCB (Central Control Board) with Enclosure - Natural Gas 9007140005 (new # 100111746)
1 CCB (Central Control Board) with Enclosure - Propane 9007141005 (new # 100111747)
2 Blocked Exhaust Switch 9006282015 (new # 100111058)
3 Blocked Intake Air Switch 9005972215 (new # 100110783)
4 Blower Prover Switch 9006280015 (new # 100111056)
5+ Temperature Probe 9004238215 (new # 100109721)
6 Anode - Aluminum 9003892005 (new # 100109594)
6A Anode - Magnesium 9001829005 (new # 100108660)
NOTES:
- The manufacturer may change part numbers and availability at any time.
+ Not shown. Located under side front cover.

 

 

Blower / Burner Assembly:

Item Description
GDHE-50
120 / 121 Series
1 Blower 9006423005 (new # 100111184)
3 Burner Assembly 9006970005 (new # 100111646)
4 Gas Valve / Venturi Assembly - Natural Gas 9006425005 (new # 100111186)
4 Gas Valve / Venturi Assembly - Propane 9006426005 (new # 100111187)
6 Burner Adaptor Gasket 9007138005 (new # 100111744)
7 Ignitor 9006968005 (new # 100111644)
8 Flame Sensor Rod 9007229005 (new # 100111830)
9 Wire Harness 9006969005 (new # 100111645)
NOTES:
- The manufacturer may change part numbers and availability at any time.

 

 

Direct Vent Kit for Cold Climate, Exhaust Elbow Assembly:

Description
GDHE-50
Series 120/121
2 in. Direct Vent Kit, ULC S636 Compliant 318221-000 (new # 100072255)
ULC S636 Compliant Exhaust Elbow Assembly 9006785005 (new # 100111484)
NOTES:
- The manufacturer may change part numbers and availability at any time.

 

 

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