Roca
Incomplete Combustion / Sooting
Furnace flame is yellow or orange and soots up the flue terminal
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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 burner ports, Incorrect gas/air ratio, Restricted air intake, Wrong gas type setting on Roca control
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Sooting indicates dangerous combustion and potential CO production.
- Inspect air intake and flue: Ensure both are clear and correctly installed.
- Clean burner: Remove and thoroughly clean the burner and combustion chamber of soot and debris.
- Check gas type setting: Verify that the furnace is configured for the correct gas type (natural gas or LPG) as per the data plate.
- Professional combustion analysis: A technician must perform a flue gas analysis and adjust the gas valve or venturi as required.
Warning: Do not operate the furnace until combustion has been checked and corrected by a qualified professional.
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Repair Difficulty
Professional Required
5/5
Required Part
Burner Assembly
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