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Thanks! I don't think this really has any bearing on my problems, just happened to come across it. Main problems are: Expansion vessel gone! : Small leak on main heat exchanger. I did wonder if the leak has started due to over pressure with the expansion vessel gone. Expansion vessel not a...

Hi! I have an old Vaillant VCW 242 EH. Can anyone tell me if the small expansion vessel for the DHW should have a charge in it?? It is only small but there is a schrader valve on it and pressing it lets no air or water out. Should this be pumped up to a certain pressure?? Thanks! Phil

Jumping in on this one! Friends oven is doing the same. I am pretty sure the capacitor is bad. Just want to know if I have to replace exactly, like for like. This one says 1.14 uF 2100 v. Would a 1.2 uF one do??? Thanks! Phil

Hey, something has changed with the boiler! I have done NOTHING to the boiler! You used to start the shower off by putting in on full hot (Hot water comes from the BOILER) and when the hot had stabilised you would then back the shower off (adding a bit of cold) to make a comfortable temp...

Agile, Will the NTC sensor, if it's dodgy, cause the flame to not modulate downwards?? The flame most definitely modulates upwards when I start the boiler but not sure if it is modulating back. I am wondering if this is why her showers go cold? She has to keep adding cold as the hot water temp...

Hi! Agile. The hot water dial is turned fully to get least flow and most hot water, if you know what I mean ;-) Phil

Hi! Can anyone point me in the right direction for what to look at? My Vaillant VCW 242 is driving my wife nuts (she is the one who likes hours under the shower) The shower has got to the point where you have to really back off the hot water (mixer shower) a lot to have it cool enough to stand...

Hi! Was just wondering if someone could shed some light on Vaillant VCW diverter valves. I have a VCW 242 EH and have noticed for quite some time now that the central heating only runs well if the knob is set around 6/7 or above. Set lower than this and the thing just modulates down really...

Hi! Me again with my trusty VCW 242 EH! :D Well, apart from the dip in DHW temperature that has been noticed lately! I am just wondering if anyone here knows about the DHW thermostats on these?? I have today pulled the wire off the DHW stat (leaving the NTC lead and the other lead on it) Out...

Thanks Tony! Would I clearly be able to pinpoint the DHW heat exchanger by measuring temps of heating water in and out and DHW in and out or is there a lot more to it?? Do I need to do an accurate measure of DHW flow rate?? I am loathed to change what has been a very reliable boiler, that is...

Hi! Can the people in the know here help me out? I have noticed recently that the DHW out of my old (trusty) Vaillant VCW 242 EH combi compact boiler is not coming out as hot as it did. I have just replaced the diaphragm pump as I got one really cheap (the old one had the split plastic...

YUP, been in to the diaphragm pump. The two plastic elbows were split! As you said, thrown them away and put the plastic pipes straight on. Funny that, I still have the old type DHW heat exchanger in mine, maybe they don't ALL leak and need changing, yet these plastic bits had split! Must be a...

Well, I ran my bath tonight and had my thermometer under the tap. 45'C is the top temp. As far as I know the knob on the water section is turned down to the lowest flow rate possible (it doesn't want to turn now) I have never measured the water temp before! Phil :D

Thanks for that Tony. As it's my boiler, that is not a problem! If it goes wrong again I will just mend it again. My time is cheap :D My next problem is finding the right bit of rubber. The part number in my manual doesn't seem to match the numbers found on 'tinternet :x Phil

Thanks Tony. I will keep fiddling. I did take the diverter valve apart quite some years ago as it wasn't switching properly. From what I remember we had hot water but no heating! A good clean out and it was right as rain. I didn't replace the diaphragm in there at the time and should have...

Yup, that would be my suggestion too! :lol:

Hi! Can anyone tell me whether it is possible to get a Water Section Repair Kit for a Vaillant VCW 242 EH??? I have a suspicion that the diaphragm may be going! Is there not also other seals that may need replacing?? I know I can buy the diaphragm seal (not sure which is the proper part No...

Sorry to bump a very old post BUT; I am having a similar problem to this. I have an old VCW 242 combi compact which has been very little trouble over the years (we have been in the house13 years, boiler ???? years) We have just noticed recently that the hot water is not coming quite just as...

HI! I have an old Vaillant VCW 242 EH in my house running 6 radiators, 3 up and 3 down. I have just got around to controlling the system with a thermostat. I am finding that with the boiler set on 5 (about half way position) the boiler doesn't fire for very long at all before switching off...

:D Thanks, yes, that does work fine. I just wasn't sure if it should have been through 4 and 5! The manual I have for the boiler shows a connection from 3 to a Randall time switch and connections from the Vaillant thermostat to 4 and 5! Mind you, the Vaillant thermostat is also connected to...