What does the Unical 11 fault code mean?

Your boiler is locking out because it thinks a flame is present inside before it has even tried to ignite.

How much does it cost to fix Unical error code 11?

Typical repair cost for the Unical 11 fault is £90-180 including labour.

Unical 11 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

PARASITE FLAME Flame detected upon ignition. Check the wiring of the Ign/Det. electrode and remove any oxidation. Check for humidity between drain wire and ceramic, if necessary, replace the electrode, press the unblock key, if the anomaly persists, replace the electrode (4).

From this model's manual

Verified against the Unical/Unical Alkon C 28 He installation & service manual.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register →

Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like 11: 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.

All 33 fault codes on the Alkon C 28 HE

Seeing a different code? Every code this model can display, in one place.

1 4 5 6 8 09 12 13 14 15 16 17 18 20 21 22 23 24 26 27 30 32 33 38 43 44 45 53 55 75 80 81

Your boiler is locking out because it thinks a flame is present inside before it has even tried to ignite.

What the manual says

Engineer required

Avoid the next call-out bill

All 33 fault codes on the Alkon C 28 HE

Related guides you might find useful

Boiler keeps cutting out

When to replace your boiler

Is boiler cover worth it?

Recently viewed