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The plumber is an experienced heating engineer Ian, and even if the heat exchanger isn't at fault it wouldn't have cost me anything to find out. How would I check to see if the pump is functioning properly? Thanks, Kyle

I think I missed the joke? Kyle

Just to update the thread, I've had a plumber look at my boiler. He pressed the internal reset button for the overheat thermostat and turned the boiler on. After a few seconds, the boiler cut out and showed an 'F3' error code which means that the heat exchanger is blocked. He's told me how to...

Thanks to both of you for the replies, I'll see what I can do and post the cause/solution here for others. Thanks again :) Kyle

Recently, my boiler has decided it's not going to strike up, and instead shows an F1 error code. I know the error code is basically telling me that the safety cut-out has kicked in (this normally happens when I run out of gas but can happen for numerous reasons.) I've found on other forums...

Thanks for the reply. I'm pretty sure he did. In any case, he's ad a look since and said that the water flow is ok. It's just strange that it's doing the same thing as the old unit, could the new unit have a faulty thermostat?

Hi all, Last year, my old shower (an 8.5kW unit that had been installed years ago, before I bought my house) started cycling from scalding to freezing. For various reasons, I put off replacing it until recently, when my step-father (a qualified plumber, no longer in the trade) fitted my...