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Thanks for all the info folks. Is all out of my depth so we are going to get the good bloke back who serviced the boiler and let him have a look at it. Cheers Alex

Hi Yes the radiators get hot. As far as I can tell the actual heating of the house works fine (Though I cant tell if its taking longer to heat up due to the off&on&off&on aspect) Thanks for the idea though. Alex

Hi Please any advice would be appreciated. We have a baxi solo non-combi boiler feeding a pressurised (sealed) CH system Our boiler switches on in the morning and burns for a short while (to get up to temp presumably) and then starts firing up&off&up&off etc... The boiler stays on the...

Thanks Tony I think ill have a look under the floor while the noise is happening and see if I can locate the exact position and grab hold of it. The position under the floor where it is coming from is a particular location of a number of junctions and when the installer first fitted it it...

Hi thanks, but.. can the valves be causing the noise without themselves actually being at fault? IE increasing pressure or flow elsewhere in the system and causing a resonance. Thus if we then replaced them, the fault would still remain as it would not be within the TRV's Not sure myself but...

Hi I did mention that the motor valve has been replaced recently (as a seperate fault) and this didnt affect the noise. I didnt mention the reason for that fall-out as I considered it not relevant and private but as I have no wish to be in the catagory of "The Worst", the fall out was due...

Hi Thanks for all the thoughts folks. The only wierd thing is that the droning noise is not coming from the TRVs. Its coming from the airing cupboard where the motorised valve and hot water cylinder is located. (Theres also a hole in the floor in the airing cupboard leading under the landing...

Hi Could anyone please suggest a reason for the noise in my heating. Basically when its turned on its quiet for about 30mins and then it starts droning. The drone gets louder and then stays for the duration of the heating being on. Its a kind of constant drone. Ive listened at the pump...

Apologies for taking this onto your subject but I thought opening up another thread would not be quite right as the subjects are similar but... Low energy standard bayonet type bulbs seem to have a disclaimer on the pack that they are not for use in enclosed lights or externally. Why is this...

Thanks for the help folks its much appreciated I will pop the top off and have a look before ordering :) Thank you all very much In answer to Nickso who asked why I need to know which it is in order to replace it: Its bust and so needs replacing. There are two different models that from...

Hi In order to replace my Danfoss motorised valve I will need to know whether its a shoe or paddles type. Is there an easy way to determine this as from the outside they look the same and I cant find any photos or diagrams of the inside. Thanks a lot folks :) Alex

Thank very much for all the help, explanations and advice youve all given. Ive adjusted the speed of the pump and it seems to make little/no difference to the noise. Ive also had to use the manual switch a couple of time now to get the CH-only to actually kick-in. This morning as well...

Thanks Mandate ill give those suggestions a try and see what I come up with. If I switch the MV to CH only (constant motor power to fight against spring) and then switch it off after a minute, am I right in thinking that the controller will relay a message to the MV to say "were all switched...

Ive had a look at my pump again. It doesnt sound to be making the noise to be honest but I dont know if the noise could be carrying down the pipes and being heard elsewhere. The pump is on speed 3 out of a choice of 3. No idea if this is correct for my system so not sure if turning it down...

Thanks very much guys for the thoughts thats great. As the drone "sounds" to be coming from the valve, I had wondered if it could be a problem with the outlet to the CH part of the actual valve. This way, if the problem was there, it would explain why the drone is absent when HW is chosen and...

Hi Please could somebody help with a bit of advice on my heating system and motorised valve. I would be extremely grateful of any help oradvice. Our motorised valve seems to be faulty at the moment and our heating has also been making noise for some time so I am wondering if they could be the...

Thanks to you both :) Yes they are both the same part number and both have the accelerator (Though not too certain what that does) They were identical inside and I wired the new one exactly the same as the old one. I guess one is on the faulty side :( will have to get a wall thermometer...

Sorry to bump this post. If its against forum rules then I do apologise. Thermostat is still not registering what I expect it to. Is there a margin of error on these? Another thought is do these thermostats need claibrating somehow so that the temp indicated by the "click" corresponds with...

Hi I hope some kind person can help me please. My Danfoss RMT230 mech/elec roomstat stopped working so I bought an exact replacement. As I was fitting the replacement, some debris dislodged from the old one and so that works now anyway (Mustve been in the way of some contacts). Still...