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Hi again, After my problem of a few weeks ago, where my boiler wouldn't fire at all, it's now behaving strangely - I think. It's an Ideal Classic, and I had the fan replaced and a service done after my previous issue. Now, what I notice is that, when heating is required, the boiler fires for...

You're right, a bit of lube has fixed it for now, but I'll get the fan replaced anyway. Certainly wouldn't delve in any further, or consider replacing the fan myself, but worth mentioning.

Typical. Coldest day of the winter and our CH/HW boiler isn't firing. When I turn HW or CH or both on, with the room stat on, the pump starts but the boiler doesn't fire. I'm suspicious of the fan on the boiler because it was noisy yesterday, as if the bearings were going or something. My...

Ta. I have no idea what a mid-position valve looks like inside, but I get the gist of your comment. And is there a solution? New valve?

A quick update. I bought a replacement motor for £13.49 (approx!), fitted it, and now the valve seems to be working OK. At least, when I select the various combinations of H,W, or both, I see the the indicator moving on the side of the actuator, and the boiler fires. I have a query though...

Cheers for that. I'll probably leave for the weekend when I have more time. In the meantime I need to find where to isolate the power from the actuator. There's the fusbox, an isolating switch in the airing cupboard next to the junction box (but that could just be for the immersion heater)...

Confirmed it doesn't have a button on the side. Couldn't find a user called 'gooseander'. [EDIT - found him/her, there's no e in the middle - it's goosander] Now, I'm wondering whether it's worth a go just replacing the motor. For the sake of less than £20, I would think it's worth a punt...

Just checked - I'm afraid there's no button on mine. It must be an older version that's not "snap on". I suspect this means I'd need to replace the valve as well. What about just replacing the motor?

OK. Now, the silver thing with the orange wires that you included a picture of above, that's just the motor, yes? The actuator is the whole thing, yes? Like this http://www.screwfix.com/p/drayton-mid-position-valve-actuator/40818 Not sure if I can just replace the actuator. Did I read...

White wire from room stat definitely reading 230. Checked by turning stat off and back on. Had to check it in the junction box because I can't see where to check at in the valve. I've taken the cover off the valve but it's very crammed in there - the motor prevents you getting to the wiring...

A quick update on the problem. I still haven't had a chance to check the voltages, but a weird thing happened last night. As I mentioned previously I'd set the CH (only) on with the room stat high (30deg) and nothing happened. The indicator on the valve was still on the W setting. I then...

Ta very much for that. Just had a quick look, and when I turn the CH on the indicator stays in the W position and nothing happens at the boiler. So that points to the motor, yes? Haven't checked any voltages yet, will need to leave that til tomorrow. Would I need to take the cover off the...

Hi, Turned on the CH today but the boiler didn't fire. Thermostat is OK I think, because it clicked "on". I'm suspicious of the ACL mid-position valve 679H340-30L0 - could it prevent the boiler from firing? I can sort of force hot water into the heating circuit by turning on the HW as well...

Checked - no hot water going into the loft. So what does one do? Wouldn't wet rafters rot, given enough time? And what about drips onto the insulation? To add insult to injury, we've stored some stuff in the loft, which is now getting wet. Could cover with sheets I suppose.

Yes, I had wondered about ventilation. Unfortunately, I don't have gable ends, but I do have soffit vents. Mind you, I haven't crawled along far enough to make sure they're not blocked. I imagine it's quite difficult to get right to the edge.

Thanks - that's comforting to know ... I think. Where's this moisture supposed to go? Is it normal for it to drip onto the insulation?

I've been up in the loft today for the first time for a while and I was somewhat surprised to see water dripping at various points from the roof lining. Some of the rafters are quite wet where they touch the lining. I can only assume that this is condensation (I can't believe the roof is...

Oh, b*gger. That doesn't sound too good. Ideally, I'd like to fix a strip of skirting board, but I fear it's going to be almost impossible to get to from underneath the units. It's going to be hard enough to use the foam - I haven't even checked if I can reach yet. Any other bright ideas?

Thanks for that. There is no skirting board behind the kitchen units, and it's going to be hard to get to, so I may have my first experience of expanding foam.

Hi, I'm in the process of finding, and hopefully fixing, all the draughts in my very draughty house. I've always suspected that there's something amiss behind the kitchen units because the crockery we keep in them is always extremely cold. I've taken the plinth off the sink unit and I've...