Unknown
30 on Viessmann Vitodens 111-W B1LF 25kW

Viessmann Vitodens 111-W B1LF 25kW fault code 30

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

What the manual says

Manufacturer manual

Regulates without flow temperature sensor for low loss header. Short circuit, low loss header sensor

From this model's manual
Verified against the Viessmann/Viessmann Vitodens 111 W B1lf 6167585 installation & service 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 fault requires 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 30: 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 95 fault codes on the Vitodens 111-W B1LF 25kW

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

781112131415162949505758596263676869707173747789919295100102103104142160161163182183184185345346348349352353354355357359361365369370372373377378379380381382385386387388395396399400401402403404405416425446453454457463464467468471474517540544545738E10E12

Related guides you might find useful

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →

Boiler service cost

What a UK service costs and what a proper one includes.

Read →