F37
Ferroli
Low System Pressure
Boiler shows F37; often indicates low water pressure on many Ferroli combi boilers.
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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
System pressure below threshold, Leak in heating circuit, Faulty pressure sensor, Failed expansion vessel causing frequent pressure loss
How to Fix / Troubleshooting
Safety first: Allow the system to cool before topping up pressure.
- Top up pressure: Use the filling loop to raise pressure to 1.0–1.5 bar when cold. Close the valves fully afterwards.
- Bleed radiators: Bleed air and re-check pressure, topping up again if needed.
- Monitor pressure: If pressure drops repeatedly, there is likely a leak or expansion vessel issue.
- Engineer checks:
- Inspect for leaks and repair as needed.
- Check expansion vessel pre-charge and recharge or replace if failed.
- Test and replace the pressure sensor if giving incorrect readings.
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Repair Difficulty
Medium
3/5
Required Part
Water Pressure Sensor
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