Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner CONTACTOR FAIL Error Fix: Contactor Failure or Pitting

The contactor is an electrically operated switch inside the outdoor unit that turns the compressor and fan on/off in response to the 24VAC signal from the thermostat. Failure modes: (1) Stuck OPEN — the contactor coil fails to energize or mechanical contacts are stuck apart. The outdoor unit never starts. Check for 24VAC at the contactor coil terminals from the thermostat wire. (2) Stuck CLOSED — contact points are welded together from electrical arcing. The compressor and fan run continuously even when the thermostat is not calling for cooling. This can freeze the evaporator coil and waste significant energy. (3) Pitted contacts — years of arcing degrade the contact surfaces, causing high resistance, overheating, and intermittent operation. Inspect the contactor — if contacts are blackened, pitted, or rough, replace the contactor ($15-30 part, straightforward replacement with a screwdriver).

warning2 fixes available

Quick Answer

Error CONTACTOR FAIL on the Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner means: Contactor Failure or Pitting. The top-ranked community fix is “Replace the Contactor Assembly” (medium difficulty, ~40 min, DIY cost: $15-$30). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · air conditioner

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many air conditioner repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $120-$200.

Other Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner Error Codes

CAPACITOR FAIL

Run/Start Capacitor Failure

2 fixes

FAN MOTOR FAIL

Condenser Fan Motor Failure

2 fixes

FREEZING UP

Evaporator Coil Freezing — Ice on Refrigerant Lines

2 fixes

NOT COOLING

AC Not Cooling — Outdoor Unit Running

2 fixes

NOT STARTING

Outdoor Unit Won't Start

2 fixes

REFRIGERANT LEAK

Refrigerant Leak — Low System Charge

2 fixes

SHORT CYCLING

AC Turns On and Off Rapidly

2 fixes

People Also Ask About Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner Error CONTACTOR FAIL

What does error code CONTACTOR FAIL mean on a Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner?

Error code CONTACTOR FAIL on the Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner means: Contactor Failure or Pitting. The contactor is an electrically operated switch inside the outdoor unit that turns the compressor and fan on/off in response to the 24VAC signal from the thermostat. Failure modes: (1) Stuck OPEN — the contactor coil fails to energize or mechanical contacts are stuck apart. The outdoor unit never starts. Check for 24VAC at the contactor coil terminals from the thermostat wire. (2) Stuck CLOSED — contact points are welded together from electrical arcing. The compressor and fan run continuously even when the thermostat is not calling for cooling. This can freeze the evaporator coil and waste significant energy. (3) Pitted contacts — years of arcing degrade the contact surfaces, causing high resistance, overheating, and intermittent operation. Inspect the contactor — if contacts are blackened, pitted, or rough, replace the contactor ($15-30 part, straightforward replacement with a screwdriver).

How do I fix error code CONTACTOR FAIL on my Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner?

The most successful fix is "Replace the Contactor Assembly" (medium difficulty, ~40 minutes). Estimated DIY cost: $15-$30. HomeMD has 2 community-ranked fixes for this error.

Is error code CONTACTOR FAIL on a Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner serious?

This error is rated warning severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner error CONTACTOR FAIL myself?

Yes — the top-ranked community fix ("Replace the Contactor Assembly") is rated medium difficulty and takes about 40 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Phillips screwdriver.

How much does it cost to repair Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner error CONTACTOR FAIL?

DIY cost: $15-$30. Professional repair typically costs $120-$200. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner have?

The Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner has 7 other known error codes, including: CAPACITOR FAIL (Run/Start Capacitor Failure), FAN MOTOR FAIL (Condenser Fan Motor Failure), FREEZING UP (Evaporator Coil Freezing — Ice on Refrigerant Lines), NOT COOLING (AC Not Cooling — Outdoor Unit Running), NOT STARTING (Outdoor Unit Won't Start), and 2 more.

What other error codes does the Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner have?

The Rheem Rheem Classic Series RA16 3-Ton 16 SEER Central Air Conditioner has 7 other known error codes:

CAPACITOR FAIL — Run/Start Capacitor Failure (2 fixes)
FAN MOTOR FAIL — Condenser Fan Motor Failure (2 fixes)
FREEZING UP — Evaporator Coil Freezing — Ice on Refrigerant Lines (2 fixes)
NOT COOLING — AC Not Cooling — Outdoor Unit Running (2 fixes)
NOT STARTING — Outdoor Unit Won't Start (2 fixes)
REFRIGERANT LEAK — Refrigerant Leak — Low System Charge (2 fixes)
SHORT CYCLING — AC Turns On and Off Rapidly (2 fixes)

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