Vaillant boiler repair
ecoTEC Plus and Pro repairs, servicing 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 Vaillant boilers
F.28 — ignition failure
The boiler tried to light and failed. Usually gas supply, a dirty ignition electrode or a blocked condensate pipe in cold weather.
F.75 — pump / pressure sensor
No pressure rise detected on start-up. Typically a failed pressure sensor, a waterlogged expansion vessel or a sticking pump.
F.22 — low water pressure
System has dropped below about 0.5 bar. Top it up, but if it keeps falling you have a leak or a failed vessel.
F.62 / F.61 — gas valve faults
Gas valve shut-off delay or control fault. A genuine Vaillant valve plus setting up is the fix.
Lukewarm hot water
Almost always a scaled plate heat exchanger or a passing diverter valve — both very common on ecoTEC combis.
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
If you do replace, we fit Worcester Bosch Greenstar and Viessmann Vitodens — both with up to a 12-year guarantee registered in your name.
from £1,795
Straight talk
Is your Vaillant worth repairing?
A Vaillant ecoTEC under about twelve years old is nearly always worth repairing — parts are readily available and the build quality justifies it. Pre-2008 Turbomax and ecoMAX units are usually better replaced.
Fault codes
Vaillant 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.
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60 second boiler quote
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Frequently asked questions
Do you repair Vaillant boilers?
Yes. We repair, service and replace all current Vaillant ranges including ecoTEC Plus, Pro and Exclusive. Diagnostic visit is £99 inc VAT, refunded against the repair.
How much is a Vaillant repair?
Most Vaillant repairs land between £120 and £380 inc VAT depending on the part. Diverter valve cartridges and pressure sensors are at the lower end; gas valves and PCBs at the top. You get a fixed price before we start.
Is Vaillant better than Worcester?
They're both strong. Worcester tends to have quicker local parts availability and the best UK service network, which is why we fit it. Vaillant modulates a little better at low load. Neither is a mistake.
Will repairing my Vaillant void the guarantee?
No, as long as the work is carried out by a Gas Safe registered engineer using approved parts and recorded properly. We record every visit.