Potterton boiler repair
Promax, Suprima and Profile repairs and conversions. £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 Potterton boilers
PCB failure (Suprima)
A well-documented weak point. Replacement boards exist but the cost rarely justifies it on an old unit.
Ignition lockout
No flame detected — gas supply, electrodes or frozen condensate on the newer condensing models.
Overheat / cycling
Poor circulation from sludge or a failing pump. Often a powerflush job, not a parts job.
Losing pressure
Expansion vessel or a hidden leak under floors — we pressure-test rather than guess.
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
We convert a lot of Potterton back boilers to Worcester Bosch Greenstar combis. Old boiler and cylinder out, combi in, fireplace made good — normally two days.
from £1,795
Straight talk
Is your Potterton worth repairing?
Promax units under about twelve years old are worth keeping going. Suprima, Profile and back boiler Pottertons are almost always better converted to a modern combi — the running-cost saving alone is significant.
Fault codes
Potterton 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
Can you still get parts for a Potterton?
For Promax and Gold, yes. For Suprima and older Profile units, availability is thin and we'll tell you honestly before you spend money on a diagnostic.
Should I repair or replace my Potterton?
As a rough rule, if the repair is more than a third of the cost of a new boiler and the unit is over twelve years old, replace it. We'll price both so you can compare.
Do you remove Potterton back boilers?
Yes — it's one of our most common jobs across Dudley, Halesowen and Birmingham. Two days, fireplace made good, everything notified to Gas Safe and Building Control.