Air-source heat pump outdoor unit beside a house in the snow
7 components covered

Field manual · Air Conditioner

Daikin DX16SA / DZ16SA and DX14SA / DZ14SA single-stage condensers and heat pumps: quick sheet

Covers: Daikin-branded residential split outdoor units built in the Goodman (Daikin Comfort Technologies) plants: DX16SA and DX14SA air conditioners, DZ16SA and DZ14SA heat pumps. Prefix DX = air conditioner, DZ = heat pump; the two digits are the SEER class; S = single stage; the next letter is the design series. The digits after that give nominal capacity in kBtu/h followed by a voltage digit (1 = 208/230 V single phase), then revision letters: e.g. DX16SA0241A, DX16SA0371A, DZ16SA0421BB, DX14SA0361. (Pattern inferred from model numbers seen in listings; confirm tonnage on the data plate.) Also seen: DX13SA (13 SEER, discontinued under the AIM Act R-410A phase-down). Not covered: DX16TC/DX18TC two-stage, DX17VC/DX20VC/DZ20VC inverter models (Daikin compressors, ComfortNet communicating). Electrical and defrost details are the same type as Goodman GSX16/GSZ16: see the Goodman GSX/GSZ quick sheet for contactor, capacitor, fan motor and defrost board tests.

Single sourceBrands: Daikin7 components

Daikin bought Goodman in 2012, and the single-stage DX/DZ 14 and 16 lines are Daikin-badged units from the Goodman platform: scroll compressor, PSC condenser fan motor, dual run capacitor, contactor, and (on DZ heat pumps) a time/temperature defrost board with reversing valve. What differs from Goodman is mainly the badge, the model naming and the warranty: Daikin markets a 12-year parts and 6-year unit replacement limited warranty on these models, conditional on online registration within 60 days. Daikin product registration runs through Goodman's warranty site, which is a quick way to confirm the family.

Safety first

  • Disconnect and verify 0 V before touching the control box; discharge capacitors.
  • All refrigerant work (charge, recovery, brazing, leak repair, compressor or reversing valve replacement) is blocked: refer to an EPA 608-certified technician.
  • Do not use the defrost test pins on a unit you have not identified on the wiring diagram; wrong pins can damage the board.

How it works

Cooling (DX and DZ): the thermostat Y call energizes the 24 VAC contactor coil; the contactor sends 208/230 VAC to the compressor and fan. The DX16SA uses a single-speed PSC condenser fan motor and a single-stage scroll compressor, so capacity is fixed.

Heating (DZ only): the reversing valve shifts the refrigerant flow so the outdoor coil becomes the evaporator. The O terminal energizes the reversing valve in cooling on Goodman-platform heat pumps (confirm on the unit wiring diagram).

Defrost (DZ only): the defrost board counts compressor run time with the coil cold (sensed by the defrost thermostat or sensor on the outdoor coil). After the selected interval it shifts the valve to cooling, stops the outdoor fan and calls for indoor auxiliary heat until the coil warms or a time limit is reached.

Warranty logic: if the unit is not registered online within 60 days of installation, only the initial (shorter) warranty term applies, except in states/provinces where registration cannot be required (California and Quebec are named in Daikin's warranty table).

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Air-source heat pump outdoor unit beside a house in the snow by PeterEastern, CC BY-SA 4.0

Diagnostic guides for this appliance

Guide · Air Conditioner

PTAC not cooling (fan runs, air not cold)

Most PTAC no-cool calls are airflow (filter, coils), a wrong control setting or a failed compressor start component. Rule those out before suspecting the sealed system.

6 steps ~60 minmoderate
Guide · Air Conditioner

PTAC not heating (electric heat or heat pump)

PTACs heat with electric strip heat, a heat pump, or both. Heat pump models switch to strip heat in cold weather. Check settings, then the heater element and its limits, then the reversing valve.

5 steps ~60 minmoderate
Guide · Air Conditioner

PTAC error codes: how to read and clear them

Most PTAC brands store fault codes that can be shown with a button combination on the control (for example GE Zoneline uses a MODE + another key sequence on some models). Read the active code, fix the cause, then clear it.

4 steps ~20 mineasy

Other air conditioners manuals

Manual · Air Conditioner

Goodman / Amana GSX air conditioner and GSZ heat pump outdoor units: quick sheet

Goodman GSX (cooling-only condensers) and GSZ (split heat pumps), single-stage, 13-16 SEER class, plus Amana/Daikin badged equivalents. Heat pumps use a time-temperature defrost control board with selectable intervals.

7 components5 common failuresGoodman, Amana, Daikin
Manual · Air Conditioner

Carrier / Bryant split AC and heat pump outdoor units (single-stage): quick sheet

Carrier, Bryant and Payne single-stage split air conditioners (24-series style) and heat pumps (25-series style) with conventional 24 V control. Communicating Infinity/Evolution and variable-speed inverter units use different boards and are not covered.

7 components5 common failuresCarrier, Bryant, Payne
Manual · Air Conditioner

Trane XR14 / XR16 and American Standard Silver 14 / 16 outdoor AC and heat pumps (4TTR4, 4TTR6, 4TWR4, 4TWR6): quick sheet

Trane XR-series split outdoor units on R-410A: XR14 air conditioner 4TTR4 and heat pump 4TWR4 (1.5-5 ton, single-stage); XR16 air conditioner 4TTR6 and heat pump 4TWR6. Generation matters for the XR16: older 4TTR6 units (suffixes such as B or J, rated about 16 SEER) are single-stage; the 2023+ N-suffix units (e.g. 4TTR6036N1000A, 4TWR6036N1000A, up to 16.2 SEER2) are two-stage and are the former XR17 platform renamed XR16. American Standard equivalents: Silver 14 AC 4A7A4 (e.g. 4A7A4024N1000A) and Silver 14 heat pump 4A6H4 (e.g. 4A6H4048N1000A), both single-stage; 4A6H6 heat pump (older H-suffix Silver 16, single-stage); 4A7A6 AC stage count not confirmed. Also related: XR13 (4TTR3 / 4TWR3) single-stage. R-454B successors use a 5 prefix (5TTR4, 5TWR4, 5TTR6, 5A6H4, A5A6H6) and are not covered here. Search terms: 4TTR4, 4TTR6, 4TWR4, 4TWR6, XR14, XR16, Silver 14, Silver 16, 4A7A4, 4A6H4, 4A6H6.

8 components6 common failuresTrane, American Standard
Daikin DX16SA / DZ16SA and DX14SA / DZ14SA single-stage condensers and heat pumps: quick sheet · OnCall Tech