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Hi all, First of all my apologies if I have not approached this correctly, it is my 1st time ever on a forum. Im having issues wIt’s my approx 7 year old Vaillant Ecotec 624 boiler, it heats our water cylinder from approx 2pm-3pm, has 3 bedroom rad, 1 small hall rad & a towel rail rad on the system along with 2 zone underfloor heating, all set to come on at staggered times. During the summer when it’s heating the water there is no problem at all, during the colder months the system seems to lose water pressure Then it shuts down and a code comes up on the digital display (F something, I have forgotten but can find out) and I keep needing to top it up, this happens every approx 2 weeks. Sometimes it won’t let me top it up until I turn on a tap. there seems to be no leak anywhere, we have also replaced the pressure relief valve but to no luck. My local plumbers call, twiddle a few things in hope that it’s fixed to no prevail. Would anyone out here have any solutions? Thanks again for reading and to anyone that can help! If you need any info or pics please let me know. dan
Hi Nick I have a similar problem with a slow pressure drop with a new Vaillant Ecotec Pro 28. Daft question but how do you find the leaks and where are they? Before I had this new boiler fitted we thought there was an underfloor pipe leak as two radiators required constant bleeding. All radiators work fine now except one upstairs which is a bit slow but we don't get any air in them at all now.Any help much appreciated as I must have topped up the pressure about 6-10 times in the last 3 months. The plumber says it's not the boiler but that was some time ago. I am also a little concerned about the use of leak sealer. Plumbers must have put about 3 lots in during the last 6 months but so far as I know Vaillant do not prohibit this. If anyone knows otherwise please let me know thanks. Last but not least, I can't find the PRV on my boiler, there certainly aren't any external pipes. All pipes are well insulated and I am wondering if it was plumbed into the condensation pipe which seems to be constantly dripping down the drain. It's a large diameter pipe so no problems with icing up ;-)Thanks
Old edwardianl house with a forty year old central heating system. Modern Vaillant combi boiler that has to be regularly repressurised with mains water. This suggests a weeping joint in the system somewhere - but there us no visible evidence - may well be under the ground floor floorboards (or elsewhere). What is the best approach to finding the source of the leak? Are there any tools available whch I could hire for instance?