BoilerFaultCodesYour boiler has detected an internal issue with the component meant to release trapped air from the system, which may prevent it from heating properly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Automatic Air Vent Intermes, Ref. 02.05.010
What causes this fault?
This fault occurs when the automatic air vent fails to stay airtight or becomes blocked by debris and limescale buildup within the heating system. When this component stops functioning, air pockets can become trapped inside the boiler, causing the internal pump to struggle or the system to overheat. The most common reason is age-related wear on the internal float mechanism, which prevents it from purging air effectively.
This fault is more common in autumn when heating systems are turned back on after a long summer break, as stagnant water can cause the internal vent mechanism to seize or stick.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like E00716 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch 24/28CDi II RSF is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.