Worcester Boiler Dripping Water Underneath – No Error Code
As a Gas Safe heating engineer with over 10 years in the field, I’ve seen just about every boiler issue you can imagine.
But one that throws a lot of homeowners is this: “My Worcester boiler is dripping water underneath, but there’s no error code.”
No beeps. No flashing lights. Just a slow, worrying drip.
Let me tell you about Claire, a homeowner in Bristol, who gave me a call just last week.
“There’s water on the kitchen floor every morning,” she said.
“But the boiler’s working fine—no error messages. I’m stumped.”
When I arrived, I saw it straight away—a classic case.
Something simple, but left alone, could’ve caused big problems.
We fixed it on the spot, and now Claire’s kitchen floor is dry and warm again.
What Causes a Worcester Boiler to Leak Without an Error Code?
Even though Worcester boilers are smart and well-made, not every issue triggers an error.
A physical leak is one of those sneaky problems that can go under the radar until it causes water damage.
Let’s go through the most common culprits I find on the job.
1. Internal Leaks from Pipe Joints or Seals
Over time, internal connections can loosen or seals can degrade. This usually leads to a slow drip that collects underneath the boiler.
What you’ll see:
- Small puddle or damp patch below the boiler
- A dripping sound after the heating is turned off
Fix: Usually, a quick reseal or pipe tightening by a gas safe engineer is needed.
Claire’s boiler had a weeping connection near the diverter valve—easy to spot once the cover came off.
2. Faulty Pressure Relief Valve (PRV)
If your boiler’s pressure gets too high, the PRV releases water to prevent damage.
It’s not a fault as such, but a safety feature.
The problem is, if the valve itself is worn, it might drip continuously.
What to look for:
- Dripping from the copper pipe outside (overflow pipe)
- The boiler pressure is sitting too high (over 2.5 bar)
Expert tip: Check your pressure gauge when the system is cold. If it’s high, you may need to bleed a radiator or have the valve replaced.
3. Condensate Pipe Issues
Modern Worcester boilers are condensing boilers.
They produce a small amount of acidic water that drains via a plastic pipe.
If that pipe is blocked, cracked, or frozen, it can back up and cause a leak underneath.
Clue: White plastic pipe leading from the bottom of the boiler, often to an outside wall.
In Claire’s case, the pipe was slightly cracked where it joined the boiler, just enough for a slow drip to form.
4. Corrosion in the Heat Exchanger
This one’s less common but serious.
If your boiler is older and hasn’t had regular servicing, corrosion can eat into the heat exchanger.
It starts with a drip… ends with a flood.
What to spot:
- Brown or green marks on pipework
- Rusty water leaking
- Slight metallic smell
Honest opinion: If this is the case, replacement is likely the best option. We’ll always advise what’s most cost-effective for you.
5. Condensation or Normal Operation?
Sometimes it’s nothing to worry about. A little condensation after heating can look like a leak.
But how to tell?
If it’s a one-off tiny patch after the boiler’s been running hard, wipe it and check again in a few hours.
If it returns regularly, it’s a leak.
What Should You Do?
First off, turn off the boiler and isolate the power if water is near any electronics.
Then, give your local Gas Safe engineer a ring on 0808 164 2892.
We’ll take the cover off (safely), inspect the internals, and stop the leak at the source.
Leaving it too long can lead to water damage, mould, and even boiler failure.
Final Thought from the Field
A Worcester boiler dripping with no error code doesn’t mean you’re imagining things.
Boilers are tough machines, but they’re not invincible.
If it’s leaking—even a little—it needs attention.
By acting early, you could save yourself stress, cost, and a lot of water damage, like Claire.
Need help fast?
We’ll find the leak, fix it properly, and get your heating back on track—no guessing games, no nonsense.
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