Roca
Delayed Ignition
Furnace ignites with a loud boom or pop, especially after a long off period
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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
Dirty burner, Incorrect electrode position, Low gas pressure, Slow-opening gas valve
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Delayed ignition can damage the furnace and flue.
- Clean burner: Remove and clean the burner assembly, ensuring all ports are clear and free of rust or debris.
- Check electrode gap: Adjust the ignition electrode gap and position according to Roca specifications so that the spark occurs in the main gas stream.
- Verify gas supply: Ensure the gas cock is fully open and that other gas appliances operate normally.
- Professional gas check: Have a technician verify gas pressure and valve operation. Replace the gas valve if it is slow to open.
Warning: Do not continue to operate a furnace with explosive ignition; this is a serious safety hazard.
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Repair Difficulty
Professional Required
5/5
Required Part
Burner Assembly
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