Emergency
L 0d on Ideal Logic+ Heat

Your boiler has stopped working because it cannot safely get rid of exhaust gases or water waste, so it has shut down to protect your home.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

What the manual says

Manufacturer manual

Ignition Lockout: Blocked Flue/Condensate

Shared across the Logic HEAT2 range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This is a emergency 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 L 0d: 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.

Related fault codes

L 01View →L 06View →

All 27 fault codes on the Logic+ Heat

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

F 0AF 0dF 0tF 0UF 01F 02F 02 or FN or LNF 03F 04F 04 or L 04F 05F 05 or L 05F 06F 07F 09F 10F9FNL 0CL 01L 02L 04L 05L 06L1LN

Related guides you might find useful

Banging, kettling or whistling noise

Each noise points to a different fault.

Read →

Frozen condensate pipe

Winter cause of ignition lockouts.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →