Packaged terminal air conditioner (PTAC) under a window with its control door open, showing the set temperature and mode buttons
5 components covered

Field manual · Air Conditioner

Friedrich FreshAire PVE / PVH DC-inverter PTACs with make-up air (R-32): quick sheet

Covers: Friedrich FreshAire packaged terminal units, PV series with a DC inverter rotary compressor and built-in fresh (make-up) air, R-32. Model pattern from the IOM: PV (Friedrich digital PTAC, FreshAire platform) + E (cooling with electric heat) or H (heat pump with auxiliary heat) + nominal capacity (09 = 9,000, 12 = 12,000 BTU/h in the current range; the IOM's legend also lists 07 and 15) + voltage (K = 230/208 V, R = 265 V) + heater digit + F (FreshAire chassis) + design series, e.g. PVH09K3FC, PVH12K3FC, PVH09R..., PVH12R.... Friedrich says the range is two models at 230/208 V and two at 265 V covering about 5,800 to 15,500 BTU/h. Search terms: PVH12K3FC, PVH09K3FC, Friedrich FreshAire PTAC, PXPCFA23020.

Single sourceBrands: Friedrich5 components

Unlike a fixed-speed PTAC, the FreshAire runs an inverter compressor with an IPM board, so its code list includes inverter faults (compressor start, IPM over-current, IPM overheat, DC bus voltage). Heater size is chosen by the cord kit (default 3.5 kW; 1.5, 2.5 and 5.0 kW optional), and a DIP switch block sets functions. A red 3-position DIP switch SW2 tells the board the unit capacity and must never be changed except to match a replacement board to the chassis.

Safety first

  • Never change SW2 except to match the chassis on a replacement board (Friedrich warning).
  • Inverter DC bus holds a charge after power-off.
  • R-32 refrigerant work is blocked: EPA 608-certified technician.

How it works

Power cord kits (PXPCFA series) set the heater: e.g. PXPCFA23020 for 3.5 kW at 230/208 V on a 20 A 6-20R; PXPCFA23030 for 5.0 kW on 30 A 6-30R; 265 V kits PXPCFA26515/26520/26530 on 7-15R/7-20R/7-30R. The IOM flags a 'power cord error' if a 30 A cord is used on a 9K unit.

SW1 DIP functions (per the wiring diagram): heat pump, electric heater, humidity-controlled fresh air, freeze protection, auto restart; SW3 sets fresh-air enable and continuous vs cycling fresh air.

Room freeze protection: below 50 °F room temperature the unit runs high fan and strip heat up to 55 °F, in any mode, and can be disabled.

Indoor coil frost sensor protects the compressor when airflow is low or outdoor temperature makes the coil freeze.

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): Packaged terminal air conditioner (PTAC) under a window with its control door open, showing the set temperature and mode buttons by Central Avenue, CC BY 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, on GE Zoneline (2019 technical service guide) you hold FAN and the red AUX button together while the unit is OFF, and AUX clears stored faults; other models use other sequences, so use the model's tech sheet). Read the active code, fix the cause, then clear it.

4 steps ~20 mineasy

Other air conditioners manuals

Manual · Air Conditioner

Carrier Infinity Greenspeed 24VNA6 air conditioner and 25VNA4 heat pump (variable speed): quick sheet

Carrier Infinity Greenspeed Intelligence variable-speed outdoor units: 24VNA6 air conditioner (up to 26 SEER) and 25VNA4 heat pump (up to 24 SEER, up to 13 HSPF), 2-5 ton. Nomenclature from the service manual: 24 = AC, 25 = HP; V = variable speed; N = Infinity series; A = Puron (R-410A); 6 / 4 = SEER tier; two digits = nominal capacity (e.g. 36 = 36,000 BTU/h); voltage digit 3 = 208/230-1; compressor ID 4 = variable-speed scroll, 5 = variable-speed rotary. Serial format: week + year + plant letter + sequence (e.g. 0118E00001). Other 24VNA families (24VNA0, 24VNA9) use different software and code lists.

5 components4 common failuresCarrier
Manual · Air Conditioner

Trane XV20i / XV18 variable-speed outdoor units (4TTV0 AC, 4TWV0 heat pump, ComfortLink II): quick sheet

Trane variable-speed TruComfort / ComfortLink II communicating outdoor units: 4TTV0 air conditioners (XV20i family, e.g. 4TTV0024A1000C, 4TTV0036, 4TTV0048, 4TTV0060, 4TTV0061) and 4TWV0 heat pumps (Service Facts 4T-V0-SF). They use an Integrated Variable Speed Control (IVSC) board and a Communicating Display Assembly (CDA) in the outdoor unit. Distributor listings note several 4TTV0 revisions; confirm the full model on the nameplate before ordering parts. Single-stage XR14/XR16 units are on a separate sheet.

4 components3 common failuresTrane
Manual · Air Conditioner

Lennox XC21 air conditioner and XP21 heat pump (Dave Lennox Signature, iComfort-enabled): quick sheet

Lennox XC21 (air conditioner, service literature Corp. 1007-L2) and XP21 (heat pump, Corp. 1031-L7), 2, 3, 4 and 5 ton, R-410A, expansion valve indoor coils only. Both use an A175 main control (outdoor control part number 101798-xx) that works in communicating (iComfort) or conventional 24 V mode, plus a separate fan motor control. The XP21 literature describes a two-stage scroll compressor; the 2018 XC21 literature describes the compressor as one-stage while the same control section covers two-stage units, so confirm staging on the nameplate. For ML14XC1/EL16XC1 single-stage units see the separate sheet.

4 components3 common failuresLennox
Friedrich FreshAire PVE / PVH DC-inverter PTACs with make-up air (R-32): quick sheet · OnCall Tech