What the manual says
Manufacturer manualTest program: Burner on with set maximum CH power.
From this model's manual
Verified against the Daikin Ekomb 22 Combi installation & service manual, page 7.
DIY fix possible
Wait for the test to complete automatically (usually takes a few minutes)Turn the boiler off and back on at the power switch to cancel the testPress the 'Reset' button if the code persists
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.