Vertical Flue Adaptor Kit 1 7 716 191 016
The A010 error code on Worcester boilers indicates vertical flue adaptor kit 1 7 716 191 016.
Worcester A010 means: vertical flue adaptor kit 1 7 716 191 016. The usual causes are blocked or partially blocked flue system, incorrect flue installation (too many bends, excessive length) or terminal guard blocked with debris or ice. You can safely reset the boiler once — if A010 returns, do not keep resetting. A qualified heating engineer should diagnose the root cause.
What Does A010 Mean
The A010 code is shown by the boiler’s control board when it detects vertical flue adaptor kit 1 7 716 191 016. The boiler then stops instead of continuing to run in that condition: the code is the appliance reporting a problem, not proof that the boiler is broken.
| What you see on the boiler |
|---|
| The display shows A010 and the boiler stops until the fault is cleared |
Common Causes
Causes documented in 4 technical sources.
| Cause |
|---|
| Blocked or partially blocked flue system |
| incorrect flue installation (too many bends, excessive length) |
| terminal guard blocked with debris or ice |
| condensate drain blocked causing back-pressure in the flue |
| combustion issue — incorrect gas/air ratio |
Safety Warning
A010 involves electrical or pressure-related components. Do not attempt repairs without proper qualifications. Ensure the boiler is electrically isolated before any inspection. If you notice water leaks, unusual sounds, or pressure anomalies, contact a qualified heating engineer immediately.
Parts & Prices
Prices shown are indicative. Actual prices and availability vary by region.
Step-by-Step Diagnosis
1. Visually inspect the flue terminal outside — check for blockages, birds' nests, or ice. 2. Check the flue run — verify it is within the manufacturer's maximum length and number of bends. 3. Perform a flue gas analysis — CO and CO2 levels should be within specification. 4. Check the condensate drain — ensure it is not blocked. 5. Verify the air intake is not obstructed (for room-sealed appliances). 6. Check for signs of flue gas spillage in the room (for open-flue appliances)
How to Fix It
Clear any flue blockage
correct the flue installation if it exceeds maximum length or bends
clear ice from the flue terminal (insulate external condensate pipe)
clear the condensate drain
if combustion analysis shows incorrect values, adjust the gas valve or service the burner
Refer to the Worcester service documentation for the detailed procedure. Only a qualified engineer should carry out these repairs.
Diagnostic Tools
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Affected Models
Worcester models that can display fault code A010:
| Model Family | Output Range | Frequency |
|---|---|---|
| All Worcester models | — | Possible |
Frequently Asked Questions
Clear any flue blockage. According to the technical documentation, this is the first check on the list for A010.
A010 is not classified as a high-severity fault, so the boiler can be reset once. If A010 comes back, stop resetting: the underlying cause is still there and needs a qualified heating engineer.