Mitsubishi Error Code 1302: High-Pressure Fault

Quick Answer — Mitsubishi Error Code 1302

Error code 1302 on Mitsubishi CITY MULTI systems means the discharge-side refrigerant pressure has risen above safe limits, activating the high-pressure switch.

It usually results from blocked condensers (35 %), overcharged refrigerant (30 %), or outdoor fan failure (20 %).

The system immediately stops the compressor to prevent overheating and oil breakdown.

Turn off the unit, inspect for debris around the outdoor coil, and verify that fans are running.

Typical repair cost: $400 – $850, rising to $1 800 – $2 400 if the compressor is damaged.

Fixair technicians resolve most 1302 faults within a single visit.

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What 1302 Means

Error 1302 indicates a high-pressure cutout triggered by the refrigeration safety circuit. When discharge pressure exceeds ~600 psi (4.1 MPa), the controller stops the compressor to avoid bursting lines or valve damage. It’s a critical safety event requiring immediate inspection.

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Main Causes of 1302

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1. Blocked Condenser Coil (≈ 35 %) — Dust or debris restricts airflow and prevents heat rejection.
2. Refrigerant Overcharge (≈ 30 %) — Excess refrigerant raises head pressure.
3. Fan Failure (≈ 20 %) — Stopped or slow fans reduce cooling capacity.
4. Non-Condensable Gas (≈ 10 %) — Air trapped in the circuit raises pressure.
5. Sensor or Switch Fault (< 5 %) — Defective pressure transducer gives false signal.

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Immediate Safety Steps

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1. Turn off power to the system.
2. Clean the outdoor coil and remove obstructions.
3. Ensure all fans operate freely and blow warm air outward.
4. Check pressure with gauges only after cool-down.
5. Do not reset repeatedly without diagnosis — this can destroy the compressor.
6. Contact Fixair for pressure balance testing and refrigerant evaluation.

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Repair Costs and Timeframes (2025)

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• Coil cleaning / fan repair — $400 – $600 (1 – 2 h)
• Refrigerant recovery and recharge — $600 – $850 (2 – 3 h)
• Compressor replacement — $1 800 – $2 400 (4 – 6 h)
• Fixair technicians complete pressure testing and vacuum recharge same-day in most cases.

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Prevention Tips

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• Clean condenser coils every 3–6 months.
• Keep plants and objects at least 24 inches from the outdoor unit.
• Monitor fan motors for vibration or bearing noise.
• Check refrigerant charge annually.
• Schedule Fixair preventive maintenance to catch pressure imbalances early.

Proper maintenance prevents over 85 % of high-pressure shutdowns.

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Frequently Asked Questions

Is 1302 dangerous?

Yes. High refrigerant pressure can burst lines or damage compressors. Shut off power immediately.

Can I reset it myself?

Only after cleaning the coil and verifying fans run normally. If it returns, call a technician.

How much does it cost to repair?

$400 – $850 for most repairs; up to $2 400 for compressor replacement.

How long does it take?

1 – 3 hours for coil or refrigerant repairs; 4 – 6 hours for compressor work.

Will it come back?

Not if airflow and refrigerant charge are kept within manufacturer specifications.

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Summary

Error code 1302 indicates a high-pressure cutout in Mitsubishi CITY MULTI systems. The system shuts down to protect the compressor from excessive pressure.

Turn off the unit, check for blocked airflow or fan failure, and schedule professional service.

Most repairs cost under $850 and are completed within hours.

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