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Goettl
Heating & Cooling Combined Unit

Model # GA421-75A Official Goettl heating & cooling unit

Here are the diagrams and repair parts for Official Goettl GA421-75A heating & cooling unit, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 50 parts  |
Ignition Module (robertshaw) 608020

#NI

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Ignition module (robertshaw)

Part #608020

The manufacturer no longer makes this part, and there's no substitute part

Capacitor 300182

#NI

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Capacitor

Part #300182

The manufacturer no longer makes this part, and there's no substitute part

Anit-short Cycle Timer 304017

#NI

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Anit-short cycle timer

Part #304017

The manufacturer no longer makes this part, and there's no substitute part

Tubing And Controls Assembly Comp. 533510

#NI

All parts diagram

Tubing and controls assembly comp.

Part #533510

The manufacturer no longer makes this part, and there's no substitute part

Ignitor Wire - Honeywell 605017

#NI

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Ignitor wire - honeywell

Part #605017

The manufacturer no longer makes this part, and there's no substitute part

Cooling Capillary Tube Assembly 533305

#NI

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Cooling capillary tube assembly

Part #533305

The manufacturer no longer makes this part, and there's no substitute part

Flame Roll-out Switch 308050

#NI

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Flame roll-out switch

Part #308050

The manufacturer no longer makes this part, and there's no substitute part

Hi Prsr Cntl 309034

#NI

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Hi prsr cntl

Part #309034

The manufacturer no longer makes this part, and there's no substitute part

Compressor Capacitor 300197

#NI

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Compressor capacitor

Part #300197

The manufacturer no longer makes this part, and there's no substitute part

Mox Burner Assembly 532948

#NI

All parts diagram

Mox burner assembly

Part #532948

The manufacturer no longer makes this part, and there's no substitute part

Most common symptoms to help you fix your heating & cooling combined units

Choose a symptom to see related heating and air conditioning system repairs.

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Why is my furnace not blowing hot enough?

Thermostat problem, clogged air filter, burner failure…

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Why isn’t my air conditioner cooling well?

Dirty air filter, clogged condenser coils, low refrigerant charge, faulty compressor…

Read more

Why isn’t my air conditioner cooling?

Thermostat problems, bad compressor/condenser fan capacitor, lack of refrigerant, failed compressor…

Read more

Why won’t my furnace burners won’t stay lit?

Dirty flame sensor, failed flame sensor, damaged burner, bad high limit switch…

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Why won't my air conditioner turn on?

Main causes: errant thermostat settings, lack of electrical power, clogged drain line, wiring failure, control failure.…

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Why won't my furnace turn on?

Main causes: Errant thermostat settings, lack of power, bad interlock switches, lack of exhaust ventilation, wiring fail…

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Most common repair guides to help fix your heating & cooling combined units

These step-by-step repair guides will help you safely fix what’s broken on your HVAC system.

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How to unclog the air conditioner drain line

How to unclog the air conditioner drain line

The condensate drain line for your central air conditioner can clog with mold and mildew. Water will back up and start d…

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Repair difficulty
Time required
 15 minutes or less
How to replace the furnace flame sensor

How to replace the furnace flame sensor

The flame sensor detects when furnace burner flames are lit. You may need to replace the flame sensor if flames only sta…

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Repair difficulty
Time required
 15 minutes or less
How to replace a heating and air conditioning system thermostat

How to replace a heating and air conditioning system thermostat

The control thermostat for your HVAC system can stop working. This repair guide shows how to replace it.…

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Repair difficulty
Time required
 30 minutes or less

Effective articles & videos to help repair your heating & cooling combined units

Use the advice and tips in these articles and videos to get the most out of your HVAC system.

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Maintaining your air conditioner

Maintaining your air conditioner

Learn how to maintain your central air conditioner to keep it running smoothly all summer long.…

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

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