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Thermal Zone
Heating & Cooling Combined Unit

Model # PA42M-1S Official Thermal Zone 12 seer single-package air conditioner

Here are the diagrams and repair parts for Official Thermal Zone PA42M-1S 12 seer single-package air conditioner, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 41 parts  |
Capacitor 621435
#33

12 seer single package ac diagram

Capacitor

Part #621435

Replaced by #12908

?
Manufacturer substitution
This part replaces 621435. Substitute parts can look different from the original.
This item is not returnable
$5.26 | 
16% OFF Phone Price : $6.26
In Stock
Fan Motor 621721
#2

12 seer single package ac diagram

Fan motor

Part #621721

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

Blower Wheel 667037
#22

12 seer single package ac diagram

Blower wheel

Part #667037

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

Fan Blade 667278
#4

12 seer single package ac diagram

Fan blade

Part #667278

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

Transformer 621708
#31

12 seer single package ac diagram

Transformer

Part #621708

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

Compressor 914656
#10

12 seer single package ac diagram

Compressor

Part #914656

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

Indoor Coil D03625
#19

12 seer single package ac diagram

Indoor coil

Part #D03625

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

Dual Capacitor 55/7.5/370 621699
#34

12 seer single package ac diagram

Dual capacitor 55/7.5/370

Part #621699

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

Top Grille 669175Z
#3

12 seer single package ac diagram

Top grille

Part #669175Z

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

Compressor Cover D02893Z
#37

12 seer single package ac diagram

Compressor cover

Part #D02893Z

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…

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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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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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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

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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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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 prevent the 2 most common AC failures from ruining your summer

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