July 21


Ideal Logic Boiler Noise – Can It Be Fixed?

Need a New Boiler?

Let’s get one thing out of the way before I start this post. I am not a fan of Ideal boilers, and Ideal Logic boilers in particular. When they came out 10 years ago, it looked like Ideal had finally started building quality boilers again. So much so, that I actually recommended and installed a few (much to my regret).

Since then, over the years, they’ve proved themselves to be unreliable, fragile, and overpriced. So if you’re reading this, and you own an Ideal boiler, you have my sympathies.

I’ve recently had a flurry of call outs to Ideal Logic boilers making loud rumbling noises. It’s often so loud, it can vibrate through an entire block of flats.

Unfortunately, there’s no one part or problem that causes this fault – and I’m still learning as I go with this one. Ideal technical support are very nice, but when it comes to this fault, their diagnostics boil down to “throw parts at it until you fix it, starting with the cheapest part first”. Not what you really want from a manufacturer’s technical department.

Anyway here’s what I know so far:

  • The noise only usually happens when the boiler is on a low gas rate. This usually happens when the heating system has almost reached its target temperature, or you slow down the flow of hot water on your tap or shower.
  • Sometimes the cause is a faulty component. Other times, the boiler needs cleaning.

Things Your Engineer Can Check

Burner – check for movement. If more than 5mm, replace burner.

Venturi – clean.

Injector – clean and/or replace.

Debris in gas valve and resistance (100- 200 Ohm).

Flush heat exchanger with lots of hot water.

Clean condensate trap.

Check condensate pipe isn’t blocked.

Check sump & flue manifold for cracks or holes.

If all of the above are ok, replace the injector.

If that doesn’t work, replace the gas valve.

If that doesn’t work, replace the fan.

My Recommendations

Get Ideal to do a fixed price repair.

Or get a new boiler.

Don’t phone me!

Is it time to get a new boiler?

Vaillant Boiler

If your boiler keeps breaking down, it may be cheaper in the long run to cut your losses and get a new one.

If you would like to know how much a new boiler will cost, please fill out the form below to get 3 free boiler quotes from local Gas Safe Registered heating engineers:


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