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Oops, how did that smiley face turn up in my last paragraph?! Think I must have done a typo. I meant to write that when the boiler started up this morning d0 was set at 8. Thanks

Thanks for your postings, sorry for delay in replying, I had the installer here yesterday and then I've been trying more experiments (except when I've been lying down in a dark room with a headache ... !). I'll reply to all queries first. 1) the new boiler was fitted in February 2008, the...

Thanks to Agile and mickyg for their postings. Didn't Dave say that I didn't need an external auto bypass because my system's got a 3 port valve, or am I getting confused? The airing cupboard is upstairs on the landing. The header tank is directly above it in the loft. The boiler is...

Oh dear Dave your story about muck in the central heating system (even after power cleaning) is a bit depressing. Gulp. (Your emoticons helped slightly!). Please can you let me know what it means when you ask 'have the boiler ntc's been checked that they are fitted in the correct positions?'...

Thanks for letting me know that I don't need a bypass. My invoice states that the system was power flushed last February when the new boiler was fitted. Unfortunately I wasn't here when this happened so can only assume that my installer did what he said he would do. In mid-December, on...

Ok, I've taken a deep breath and been in the airing cupboard again and 'yes' you're right, now I can see that there are 3 22mm pipes connected to the box which has written on it Honeywell 'power head for motor valve' (one to the hot water tank, one to the central heating and one from the pump)...

Sorry Dave our postings crossed. Have had another look at the box which has written on it Honeywell 'power head for motor valve'. It is a silver metal box but doesn't have 3 22mm pipes connected to it. I think its to control the hot water going in to the hot water tank. Some time ago when...

Have been thinking, Dave, and have realised that my house isn't 'zoned'. Does this help?

Thanks for the swift response Dave! In the airing cupboard I've found (a) the pump and (b) a box which has written on it Honeywell 'power head for motor valve' and (c) a Honeywell thermostat which I believe controls the powerhead. I don't think that these are what you are asking me about...

Sorry Dave but now I'm stuck. How do I know if I have a 2 x 2 port valve or a 3 port valve? I'm afraid that I don't know what they are or where to look for them. I do know that my living room rad (where the room thermostat is located) doesn't have a trv fitted I'll report back on the d40...

Thanks for persevering with me Dave and Tony. Out of interest, since my last posting I waited until everything had gone cold again and then started up with d0=8. The boiler gently got to 68C in 28 minutes, so that was excellent. But then I again got the 10 minute S.53 delay when the boiler...

Thanks for your replies Dave and Tony. Oops, sorry about my typo error. Yes I did mean S.53. I also take your point about the fact that I'm not comparing like with like, that is, you're quite correct when you say that I tried d0=12 at a cold start and d0=10 at a warm start. But I'm...

Thanks to the helpful suggestions on yesterday's postings, I've been experimenting as you've suggested and have made quite a bit of progress today! First thing this morning (with the pump up to level 3 and d0 down to 15) I turned on the central heating system without the hot water system and...

Ok, I'm just about to (a) turn the pump speed up from 2 to 3 (thanks Dave) (b) downrate to 15 kw (thanks dangermouse46). Will report back tomorrow!

Thanks for the recent postings - I'll now try and answer any queries raised! The boiler is a Vaillant Ecotec418 I followed Agile's instructions on how to find out the boilers maximum heat output (d0 setting) and found out that the value is already set at 18 Yes, Dave, it was the main HE...

Your initial comment sounds a bit worrying, Tony! Its in the quote that the installer power flushed the system before installing the new boiler in February (I wasn't here unfortunately), and then he just drained and rinsed the system in December when the Vaillant engineer asked him to...

Thanks to gas4 you and Dangermouse46 for looking at my problem. Much appreciated. These are the answers to your queries: 1. the new boiler was installed by a qualified CORGI plumber in February 2008, but I didn't use the central heating function alone until the end of November 2008 (before...

When my central heating (but not hot water) is turned on there is a brief ignition of approximately 30 seconds before the ignition stops and an error message of S.53 appears, that is (according to the manual), 'appliance is within the waiting period of the operation block function due to water...