Common problems guide

The most common Myson Wallflame WF IV problems

The faults most likely to send a Myson Wallflame WF IV 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 3 most common faults

01

10 Emergency Engineer

Your boiler's flame is flickering or surging in an unusual, rhythmic pattern, which indicates it is not burning the gas correctly.

Est. cost: £150-300
Parts: Gas valve, Burner assembly, Flue seals

Full guide for 10

02

12 Emergency Engineer

Your boiler is failing to burn the fuel correctly, which is allowing the smell of oil to escape into your home.

Est. cost: £150-350
Parts: Oil nozzle, Flame detector, Oil pump seal

Full guide for 12

03

13 Emergency Engineer

Your boiler is struggling to ignite smoothly, causing small explosions or smoke to escape during start-up, which indicates a serious issue with combustion or venting.

Est. cost: £150-300
Parts: Ignition electrode, Burner assembly, Gas valve

Full guide for 13

Parts most often replaced

on the Myson Wallflame WF IV

Gas valveBurner assemblyFlue sealsOil nozzleFlame detectorOil pump seal

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 Myson 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 3-code list for the Myson Wallflame WF IV