Mitsubishi Air Conditioner Error F8
⚡ Quick Answer: The Mitsubishi Air Conditioner error F8 indicates a communication failure between the indoor and outdoor units. This may be caused by a high-pressure ... ✅ DIY Fixable
What Does Error F8 Mean?
The Mitsubishi Air Conditioner error F8 indicates a communication failure between the indoor and outdoor units. This may be caused by a high-pressure protection trigger in the outdoor unit or an input circuit/control board fault. Symptoms include unexpected shutdowns, the F8 error code displayed on the remote or indoor panel, and the outdoor unit ceasing operation. Ensure proper airflow and check for refrigerant issues before seeking professional help.
Common Symptoms:
- Unexpected shutdown
- Error code F8 displayed on remote or indoor panel
- Outdoor unit stops operation
Possible Causes
- High pressure protection triggered in outdoor unit (possible refrigerant/pressure issue) (medium)
How to Fix Error F8
DIY Fix Basic checks before calling service
- Ensure the outdoor unit airflow is not obstructed (clear vegetation, debris).
- Check that the unit is not overcharged or obviously leaking refrigerant (look for ice or hissing).
- Power‑cycle the system: turn unit off, wait 30 sec, then restart.
Technician Only Professional diagnosis and repair
- Inspect outdoor unit high‑pressure conditions and refrigerant charge.
- Check sensors and pressure transducers for faults.
- Inspect wiring to the outdoor unit and test input/control boards for faults, replace if necessary.
Parts needed: Pressure sensor, Pressure transducer, Outdoor unit control board, Refrigerant service tools
- Error persists after basic checks
- Signs of refrigerant leak (ice, hissing, oil residue)
- Unit does not restart after power cycle
Next step
Choose the next step for F8
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
HVAC Control Board
Controls fan, compressor, sensor, and communication functions in the HVAC unit.
- Typical part-only price
- $90 - $320
- DIY difficulty
- Hard
- Estimated time
- 45-120 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Model-compatible Air Conditioner parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Air Conditioner Fin Cleaner
For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.
Model-Compatible Washable AC Filter
A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.
Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Technical Specifications
| wattage | N/A |
|---|---|
| component | Control Board |
| resistance | N/A |
| part_number | Mitsubishi 240V PCB |
| voltage_rating | 230V AC |
Common Questions
What does F8 error mean on Mitsubishi Air Conditioner?
F8 indicates a communication failure between the indoor and outdoor units, often linked to high pressure or control board faults.
Can I fix Mitsubishi Air Conditioner F8 error myself?
Yes, check for airflow obstructions, refrigerant leaks, and power-cycle the unit.
How much does it cost to fix F8 error?
Repair costs range from ¥20,000 to ¥80,000+, depending on region and parts needed.
When should I call a technician for F8?
Call if the error persists after checks, if there are signs of refrigerant leaks, or if the unit won't restart.
Sources & References
- Fixing Mitsubishi Electric AC Fault Code F8 (community)
Data last verified: 2026-07-22
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