Rheem Heat Pump Error Codes Guide

Rheem heat pump error codes help diagnose operational issues quickly and accurately. This guide explains common Rheem heat pump fault codes, their likely causes, and practical troubleshooting steps for homeowners and technicians. Understanding these codes can reduce repair time and prevent further damage.

Code	Meaning	Quick Action
EH	High Pressure Fault	Shut Down System, Check Condenser
EL	Low Pressure Fault	Inspect Refrigerant Level, Look For Leaks
CF	Compressor Fault	Check Compressor, Wiring, Overloads
PF	Pressure Sensor Fault	Test/Replace Sensor
AF	Outdoor Fan Fault	Inspect Fan Motor/Capacitor
HC	High Current/Locked Rotor	Check Electrical Supply, Compressor

How Rheem Heat Pump Error Codes Work

Rheem heat pumps use control boards that monitor sensors and electrical parameters. When a monitored value crosses a preset threshold, the control board displays an error code on the thermostat or the unit’s LED display. These error codes correspond to specific faults such as pressure abnormalities, temperature sensor failures, electrical problems, or communication errors between components.

Knowing the difference between a warning and a lockout code is crucial: warnings may allow continued operation with reduced performance, while lockouts require manual or automatic reset after addressing the fault.

Common Rheem Heat Pump Error Codes And Meanings

EH — High Pressure Protection

The EH code indicates the refrigerant system pressure exceeded safe limits. Causes include dirty condenser coils, blocked airflow, overcharged refrigerant, or malfunctioning pressure switches. High pressure can damage the compressor and should be addressed promptly.

Troubleshooting steps: Inspect outdoor coil for debris and clean if needed. Check outdoor fan operation and capacitors. Verify refrigerant charge and pressure with proper gauges; if overcharged, consult a licensed HVAC technician to adjust refrigerant.

EL — Low Pressure Protection

The EL code signals refrigerant pressure below the minimum, commonly due to refrigerant leaks, thermal expansion valve (TXV) issues, or metering device failure. Low pressure leads to poor heating/cooling and potential compressor damage from liquid slugging.

Troubleshooting steps: Look for oil stains or dye (if used) indicating leaks. Test suction and discharge pressures and compare to rated values. Repair leaks and evacuate and recharge the system per manufacturer specs.

CF — Compressor Fault

CF denotes a compressor-related fault such as locked rotor, thermal overload, or internal failure. Causes include electrical supply issues, worn start components, refrigerant problems, or mechanical failure inside the compressor.

Troubleshooting steps: Verify supply voltage at the unit. Inspect contactors and relays, measure compressor windings for resistance, and check start/run capacitors. If internal compressor failure is suspected, replacement by a certified technician is usually necessary.

PF — Pressure Sensor Fault

The PF code indicates a pressure sensor reading that is out of range or the sensor is malfunctioning. This could be due to wiring problems, a failed sensor, or clogged refrigerant lines affecting readings.

Troubleshooting steps: Inspect sensor wiring and connectors for corrosion or damage. Test sensor output with a multimeter per service manual specifications. Replace sensor if readings are inconsistent or out of specification.

AF — Outdoor Fan Fault

AF signals an outdoor fan motor failure or insufficient fan speed. Causes include motor seizure, failed capacitor, damaged blade, or wiring issues. Inadequate fan operation contributes to high pressure faults and reduced heat exchange efficiency.

Troubleshooting steps: Check the fan blade for obstructions and physical damage. Test motor windings and replace the capacitor if it fails to hold proper capacitance. Replace the fan motor if it is seized or electrically faulty.

HC — High Current Or Locked Rotor

HC indicates the compressor or fan motor is drawing excessive current, possibly due to locked rotor, mechanical binding, or electrical supply anomalies. Continuous high current can trip breakers and cause thermal damage.

Troubleshooting steps: Measure running current against nameplate ratings. Inspect motor bearings and shaft for mechanical binding. Verify proper voltage supply and tighten loose connections. Replace motors or address mechanical issues as needed.

Less Common And Communication Error Codes

Communication Faults

Rheem heat pumps with multi-component systems may display codes indicating loss of communication between the outdoor unit, indoor air handler, or thermostat. Causes include wiring damage, failed control boards, or incompatible thermostats/control interfaces.

Troubleshooting steps: Inspect communication wiring and terminal connections. Confirm thermostat compatibility and settings. Swap or test control boards if wiring checks good and error persists.

Temperature Sensor Faults

Temperature sensor errors occur when supply, return, or ambient sensors read out of expected ranges or open/short circuits. Symptoms include incorrect thermostat response, freeze protection activation, or improper defrost cycles.

Troubleshooting steps: Measure sensor resistance at ambient temperature and compare with manufacturer specs. Replace sensors showing open or out-of-range values and ensure proper sensor placement and insulation.

Basic Troubleshooting Flowchart For Homeowners

Homeowners can follow a safe troubleshooting sequence to identify simple issues before contacting a technician. Start with power and filters, then inspect outdoor unit condition, and finally check basic controls.

1. Verify Thermostat And Settings: Ensure correct mode (Heat/Cool), setpoints, and that the thermostat is configured for a heat pump.
2. Check Power Supply: Confirm breakers and disconnect switches are on; look for tripped breakers or blown fuses.
3. Inspect Air Filters And Vents: Replace dirty filters and ensure vents are open for proper airflow.
4. Examine Outdoor Unit: Clear debris, leaves, and obstructions from the condenser. Ensure the fan spins freely.
5. Reset The System: After basic checks, reset the unit per Rheem instructions and note if the error returns.

When To Call A Professional

Certain Rheem heat pump error codes require licensed HVAC technicians, especially those involving refrigerant, compressor replacement, or complex electrical diagnostics. If the error persists after basic checks or involves suspected refrigerant leak, contact a certified technician.

Immediate technician call is recommended for: EH or EL that indicates severe pressure issues, CF indicating compressor failure, or HC showing sustained high current draw.

Maintenance Tips To Prevent Error Codes

Regular preventive maintenance reduces the frequency of Rheem heat pump error codes. Key tasks include cleaning coils, replacing filters, lubricating motors where applicable, and scheduling annual system checkups by a licensed HVAC provider.

• Replace Air Filters Every 1–3 Months Depending On Use
• Clean Outdoor Coil And Remove Debris Seasonally
• Inspect Electrical Connections And Tighten Loose Terminals
• Test Capacitors And Relays During Annual Service
• Monitor Refrigerant Charge And Repair Any Leaks Promptly

How Rheem’s Diagnostics And Displays Vary By Model

Rheem heat pumps use different control interfaces across entry-level and premium models. Some units provide simple blink codes via LEDs, while others display alphanumeric error codes on digital panels or communicate detailed fault logs to smart thermostats or service apps.

Consult the unit’s model-specific service manual or Rheem’s technical literature for accurate code definitions and wiring diagrams. Manufacturer documentation lists troubleshooting steps tailored to each model.

Safety Precautions When Troubleshooting

Always prioritize safety: disconnect power at the service disconnect or breaker before inspecting internal components. Do not attempt refrigerant repairs without proper EPA certification. Wear appropriate safety equipment when working around electrical and mechanical components.

Electrical hazards, refrigerant exposure, and rotating parts present real risks. If unsure, stop and call a professional.

Resources And Documentation

Rheem provides model-specific manuals, wiring diagrams, and technical bulletins online. Homeowners can locate the unit’s model and serial number on the data plate and search Rheem’s support site for the correct service literature.

Additional helpful resources include EPA refrigerant handling guidelines, local HVAC licensing boards, and HVAC troubleshooting communities for general guidance.

Tips For Communicating With Technicians

Provide technicians with detailed information to speed diagnosis: the exact error code displayed, when it first appeared, any recent changes (power outages, renovations), and steps already taken to troubleshoot.

Capture photos of the error code display and the unit’s data plate. This information helps technicians bring correct parts and reduces visit time.

Replacing Components Versus Repair

Deciding between repairing a component or replacing the entire heat pump depends on age, efficiency, and cost. Compressors and major control boards are expensive; for units older than 10–15 years, replacement may be more economical when considering improved efficiency and warranty on new systems.

Assess repair cost vs. replacement benefits and energy savings with a licensed HVAC contractor’s guidance.

Frequently Asked Questions About Rheem Heat Pump Error Codes

Can a homeowner clear error codes?

Many codes reset after power cycling the unit, but persistent codes indicate unresolved faults. Clearing codes without fixing the underlying issue can risk further damage.

Do error codes indicate safety problems?

Some codes, like high pressure or locked rotor, can indicate conditions that may damage equipment or create hazards. Treat these codes seriously and take immediate action as recommended.

Are error code meanings universal across Rheem models?

Basic categories are consistent, but exact codes and their format can vary by model. Always verify with the model-specific service manual.

Key Takeaways

Rheem heat pump error codes provide targeted diagnostics for pressure, electrical, fan, sensor, and communication faults. Basic homeowner checks can resolve many issues, but refrigerant and electrical faults require licensed technicians. Regular maintenance reduces the frequency of faults and extends equipment life.

For accurate code definitions and step-by-step diagnostics, consult the Rheem service manual for the specific model or contact Rheem technical support.