Common problems guide

The most common Vaillant Turbomax VU 182 problems

The faults most likely to send a Vaillant Turbomax VU 182 into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.

The 6 most common faults

01

Burner lock out indicator High Engineer

Your boiler has stopped trying to light because it cannot detect a flame or is not receiving gas, leaving you without heating or hot water.

Est. cost: £120-250
Parts: Ignition lead, Ignition electrode, Gas valve

Full guide for Burner lock out indicator

02

Ignition indicator High Engineer

Your boiler is struggling to light the burner, meaning it is currently unable to produce heat or hot water.

Est. cost: £120-250
Parts: Ignition electrode, Ignition lead, Printed Circuit Board (PCB)

Full guide for Ignition indicator

03

Flame indicator Low Engineer

Your boiler is operating normally and has successfully lit the flame to start heating your home or water.

Full guide for Flame indicator

04

Fan operation indicator Low Engineer

Your boiler's fan system is running correctly to safely remove exhaust gases, and the indicator light is simply confirming that this part of the startup process is working as intended.

Full guide for Fan operation indicator

05

Hot water demand indicator Low Engineer

Your boiler is correctly recognizing that you have turned on a hot tap and is working exactly as it should.

Full guide for Hot water demand indicator

06

Power on indicator Low DIY-safe

Your boiler is receiving electrical power and is currently in its normal standby state, ready to provide heating or hot water when requested.

Full guide for Power on indicator

Parts most often replaced

on the Vaillant Turbomax VU 182

Ignition leadIgnition electrodeGas valvePCBPrinted Circuit Board (PCB)

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

You can smell gas or see signs of a leak
The Vaillant shows an Emergency or High severity code
The boiler keeps locking out after repeated resets
You've tried the DIY checks and the fault hasn't cleared
There's visible water leaking from the boiler
The flame is yellow or orange instead of blue

See the full 6-code list for the Vaillant Turbomax VU 182