Fernox Central Heating Leak Sealer F4 Express - 400ml
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Product Information
Full details
This Fernox F4 Express 400ml Central Heating Leak Sealer is for homeowners and professionals needing a quick fix for leaks in sealed central heating systems. Its key benefit is the rapid, mess-free sealing of most weeps and leaks within 30 seconds, saving the time and cost associated with draining systems and repairs. A potential caveat is that it is designed for sealed systems only and may not be suitable for all types of leaks.
All features
| Model Part Number | 58232 |
|---|---|
| Brand | Fernox |
Extended Product Information
FAQs
How do I know if my system is sealed?
Sealed systems typically do not have an open vent pipe in the loft and are repressurized via a filling loop. Open vented systems have a visible pipe running to a tank in the loft.
Can this product be used in older, open vented systems?
No, the F4 Express is specifically designed for sealed central heating systems only.
What is the recommended dosage?
The 400ml can is suitable for systems up to 140 liters in volume, which is typically around 16 average radiators. Always refer to the product instructions for precise dosage.
Will this product clog my system?
No, the formulation is designed to be non-toxic and environmentally friendly, and it will not cause blockages to pumps, air vents, or valves.
How long does it take to work?
The sealer typically works to seal most weeps and leaks within 30 seconds of application.
Is this product safe for my boiler and other components?
Yes, the non-toxic formulation is safe for use in all Fernox protected systems and is compatible with all commonly used system metals and plastics.
What should I do if the leak continues?
Ensure the correct dosage was administered and the system circulated adequately. If the leak persists, it may be too large for this product, or there might be another issue requiring professional attention.
Troubleshooting
Leak persists after application
Ensure the correct dosage was added and the system circulated. For larger leaks or systems not circulating properly, professional assessment may be required.
Difficulty attaching adapter to valve
Ensure the correct adapter is used and the valve is clean and free of debris. Check that the valve is a standard type compatible with the adapter.
System pressure drops shortly after use
The product may not have fully sealed the leak, or there may be another issue. Check the system for other potential leak points and monitor pressure closely. Contact a professional if the issue persists.
Pros and Cons
Pros
- Fast-acting leak sealing
- Easy and clean application process
- Safe for central heating system components
- Avoids the need for system draining
- Environmentally friendly formulation
- Recyclable packaging
Cons
- Only suitable for sealed heating systems
- May not seal very large leaks
- Requires access to a filling loop or radiator valve for application
Setup, Compatibility & Care Instructions
Setup:
- Ensure the central heating system is circulating.
- Locate the filling loop or a suitable radiator valve.
- Attach the supplied adapter or the radiator key to the valve.
- Shake the can well before use.
- Press the valve on the can firmly to inject the correct dose into the system.
- Allow the system to circulate for at least 30 minutes after application.
Compatibility:
- Suitable for all types of sealed central heating systems.
- Compatible with all commonly used system metals and plastics.
- Non-toxic and environmentally friendly formulation.
Care:
- Store in a cool, dry place away from direct sunlight.
- Keep out of reach of children.
- The can is recyclable; dispose of according to local regulations.