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I replaced a scaled up heat exchanger and now the new one has scaled up again after 2 years. I have tried to descale the old one with Fernox DS3 with some success. I noticed that the CHW side does not scale up and was wandering if the heat exchanger can to turned round so the DHW uses the CHW...

Plate heat exchanger replaced and as suggested the old one showed signs of hard water scale on the HW side. Bit fiddly but once I had removed the water pump it came out easily. I now have steam coming out of my shower and a decent hot water flow rate, oh joy! Also added an inline filter on the...

Ok - thanks for all your input, I guess I need to find this filter now!

Just had a quote to repair the boiler - £340 to supply and replace plate heat exchanger, £108 to supply and install inline filter for the HW and £220 to supply and install a magna clean filter for the CH. Seems to me it would better to swap the boiler out for a new one?

Ordered a plate exchanger - is this a difficult job to change, does the water pump have to taken out - what else should I be wary of?

Ok Ive had someone look at the boiler and its probably the HE scaled up, as the boiler was functioning correctly. So it would seem I need to replace the HE (or clean it) and get an inline filter.

Yes I do unfortunately....

Sorry I remembered it incorrectly - it is showing 4 for HW and 3 for CH.

Ok - I am obviously a novice and have just realised that HE = heat exchanger, Im pretty sure this is ok as the boiler is only 3 years old. I checked the service manual, and couldnt see any mention of thermistor - does it have another name and how do you check the operation or do just replace...

Thanks - whats is a scaled plate HE and can it be easily descaled, and is there only one thermistor?

See comments above

Can any one suggest a reason why my Remeha comby cannot supply hot water at the correct temp anymore - its seems to try and goes luke warm. The central heating works fine!!