Ariston boiler repair
Clas, E-Combi and Genus repairs and replacements. £99 fixed diagnostic inc VAT across Birmingham, the Black Country and the wider West Midlands — and a straight answer on whether yours is worth repairing.
Common faults
What goes wrong with Ariston boilers
5P1 / 501 — ignition failure
No flame detected. Gas supply, electrodes or condensate blockage.
1P1 / 108 — low pressure
Below minimum. Refill; persistent loss means a leak or failed vessel.
1 01 — overheat
Poor circulation from sludge or a failing pump.
Hot water dropping cold
Plate heat exchanger scaling or a diverter valve fault.
Pricing
What a repair costs
Fixed diagnostic callout
Includes the first 30 minutes on site
£99
Typical parts and labour
Sensors, electrodes, valves, pumps — quoted before we start
£120 – £380
Major components
Fan, gas valve or PCB — we'll price replacement alongside
£350 – £550
New Worcester or Viessmann boiler fitted
Worcester Bosch Greenstar or Viessmann Vitodens, both with excellent local parts support and up to a 12-year guarantee.
from £1,795
Straight talk
Is your Ariston worth repairing?
Clas, E-Combi and Genus units under ten years old are worth repairing. Microgenus and older units are usually better replaced given parts availability.
Fault codes
Ariston fault codes we see most
Low pressure
Pressure below 1 bar — heating won't run properly
Not an emergency, but a system losing pressure weekly is leaking somewhere. Get it found before it damages floors or ceilings.
Frozen condensate
Boiler locked out after a cold night
Often a DIY fix. If it refreezes every cold snap, get the pipework corrected properly.
Symptoms
Or start with what it's doing
Boiler losing pressure
A sealed heating system should hold roughly 1 to 1.5 bar cold. If yours keeps sliding towards zero, water is escaping somewhere — pressure does not simply evaporate.
Boiler leaking water
A leaking boiler is never something to leave. Water and electrics in the same casing means the PCB is on borrowed time, and a slow leak will rot the heat exchanger from the outside in.
No hot water
When the heating works but the taps run cold, the boiler is firing — it just is not sending the heat to the right place. That narrows the fault down to a handful of components.
Boiler keeps turning off
A boiler that lights and then shuts down within a minute or two is protecting itself. Something in the safety chain — flow, flame, pressure or airflow — is not happy.
Radiators cold at the bottom
Cold at the top and hot at the bottom means trapped air — bleed it. Cold at the bottom and hot at the top means magnetite sludge sitting in the radiator, and bleeding will do nothing at all.
Boiler making a banging noise
Boilers make noise, but they should not make new noise. A change in sound is nearly always the first warning that something is scaling, sticking or starving of flow.
Book it
Get booked in today
Step 1 / 5
60 second boiler quote
No callbacks unless you want one
What can we help with?
Pick the option that fits — we'll tailor the next questions.
Frequently asked questions
Do you repair Ariston boilers?
Yes — Clas, E-Combi, E-System and Genus ranges. We confirm part cost and availability on the diagnostic visit.
How much is an Ariston repair?
Typically £130–£350 inc VAT with a fixed price agreed before any work starts.