F6
Reliance
Refrigerant System Protection / High or Low Pressure Fault
Reliance hybrid water heater displays F6 and may revert to electric-only mode
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Blocked airflow through coils, Dirty air filter, Low refrigerant charge, Blocked or kinked refrigerant line
How to Fix / Troubleshooting
Safety first: Turn OFF power. Do not attempt to open the sealed refrigerant system yourself.
Steps to check:
- 1. Clean air filter: Remove and clean or replace the air filter on the heat pump intake. A clogged filter can cause pressure faults.
- 2. Inspect coils: Check evaporator and condenser coils for dust or lint buildup. Clean gently with a soft brush and vacuum. Do not bend fins.
- 3. Verify clearances: Ensure the unit has the required clearance around it for proper airflow per Reliance specifications.
- 4. Check for physical damage: Look for kinked or crushed refrigerant lines. Any such damage requires professional repair.
- 5. Call a technician: If F6 persists after cleaning and ensuring airflow, a certified technician must check system pressures and refrigerant charge.
Warning: Running the heat pump with unresolved pressure faults can damage the compressor.
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Repair Difficulty
Professional Required
5/5
Required Part
Heat Pump Sealed System
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