What does the Atag FILL (flashing) fault code mean?

Your boiler's water pressure has dropped too low, so it needs you to top it up using the external filling loop before it can work at full capacity.

How much does it cost to fix Atag error code FILL (flashing)?

Cost varies. Contact a Gas Safe registered engineer for a quote.

Atag FILL (flashing) Fault Code: What It Means & How to Fix It

Q: Can I fix Atag fault code FILL (flashing) myself?

Locate the filling loop (a flexible metal hose) connected between two pipes under your boiler.

Technical description

Water pressure is to low (<1,0 bar), flashing FILL will alternate with indication of water pressure, boiler power of 50% is possible. The installation needs to be topped up.

DIY fix possible

Locate the filling loop (a flexible metal hose) connected between two pipes under your boiler.Open the valves on both ends of the hose slowly to allow water into the system.Watch the pressure gauge on the boiler until it reaches 1.5 bar, then turn the valves off tightly.

Find a Gas Safe engineer

Search the official register →

Your boiler's water pressure has dropped too low, so it needs you to top it up using the external filling loop before it can work at full capacity.

Technical description

DIY fix possible

Related guides you might find useful

Boiler keeps losing pressure

Low pressure — repressurise guide

Is boiler cover worth it?

Recently viewed