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Friedrich
Heating & Cooling Combined Unit

Model # THC15K50 Official Friedrich central packaged terminal unit

Here are the diagrams and repair parts for Official Friedrich THC15K50 central packaged terminal unit, as well as links to manuals and error code tables, if available.

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

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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 103 parts  |
Isolator 21063375
#42

Air handler diagram

Isolator

Part #21063375

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

Relay 21058148
Relay

Part #21058148

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

Shaft Pulley 25009300
#39

Air handler diagram

Shaft pulley

Part #25009300

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

Compressor 21091573
#11

Unit assembly diagram

Compressor

Part #21091573

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

Holder,fus 21058444
#74

Control box assembly diagram

Holder,fus

Part #21058444

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

Thermostat Knob 21058437
#66

Control box assembly diagram

Thermostat knob

Part #21058437

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

Thermostat 21059023

#NI08

All parts diagram

Thermostat

Part #21059023

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

Terminal Board 21058986

#NI03

All parts diagram

Terminal board

Part #21058986

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

Filter Mol 21058402
Filter mol

Part #21058402

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

Rework Kit 25010100

#NI13

All parts diagram

Rework kit

Part #25010100

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

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Why is my furnace not blowing hot enough?

Thermostat problem, clogged air filter, burner failure…

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

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

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