Ferroli
Insufficient Heating / Underfiring
Water heater ignites but hot water temperature is too low, even at maximum setting.
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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
Low gas inlet pressure, Partially blocked burner injectors, Incorrect gas valve adjustment, Scaled heat exchanger reducing heat transfer
How to Fix / Troubleshooting
Safety: Gas pressure and combustion adjustments must be done by a licensed gas technician.
- 1. Check user settings: Confirm the Ferroli temperature control is set high enough and that any eco/low-power mode is disabled.
- 2. Flow rate: Excessive flow can reduce outlet temperature. Slightly reduce tap flow and see if temperature improves.
- 3. Descale heat exchanger: In hard water areas, arrange for professional descaling of the Ferroli heat exchanger.
- 4. Gas-side checks (technician): A professional should measure inlet gas pressure, clean burner injectors, and verify gas valve settings according to Ferroli specifications.
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Repair Difficulty
Hard
4/5
Required Part
Gas Burner Assembly
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