Common problems guide

The most common Ariston Genus 30 Plus problems

The faults most likely to send a Ariston Genus 30 Plus 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.
10 documented codes
6 most common
0 DIY-safe checks
6 engineer needed

The 6 most common faults

02
1 Engineer

Drawing D.H.W: burner switches off - check temperature probes, faulty D.H.W. flow switch

Full guide for 1
04
3 Engineer

Drawing D.H.W: insufficient hot water temperature - check temperature probes, check gas pressures, check water flow rate

Full guide for 3
05
4 Engineer

Drawing D.H.W: noisy operation - primary heat exchanger faulty or lime-scale deposits, low heating system water pressure, check gas pressures, check temperature probes

Full guide for 4
06
5 Engineer

Decrease/increase heating circuit pressure - check for leaks on the heating circuit, faulty filling-loop, expansion vessel faulty

Full guide for 5

Call a Gas Safe engineer if…

  • You can smell gas or see signs of a leak
  • The Ariston 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 10-code list for the Ariston Genus 30 Plus

Related guides

Boiler losing pressure → No hot water → When to replace → Symptom checker →