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Fair point! I think you might be right - the sound it makes gives the impression something is resistant. I'll let you know if it solves the problem! 👍

Thanks for the responses! Sorry for the delay. Mark at Dimplex seems to think it might have something to do with the installation and suggested making contact with the people that installed it.. Something I have noticed is that the fan doesn't seem to be coming on, as it does with the other 2...

In need of some help please.. I have an unusual problem with a Quatum Dimplex storage heater (QM150RF) - it's giving off a high pitch beeping noise which is very faint and can only be heard when the room is quiet (unless you're a dog!!) Any ideas on what it might be and how to fix it please...