3 High

ECA 3 Fault Code

The ECA 3 fault code means: your boiler has stopped working because the water pressure inside the system has dropped too low.. It appears on 2 ECA models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Low Water Pressure-Water Leakage Risk

DIY fix possible

Locate the filling loop underneath your boiler.Open the valves gently to let water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close both valves firmly and check the gauge holds steady.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like 3: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

ECA models that show the 3 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

ECA 3 fault code information on this page is sourced and cross-checked against the official ECA service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026