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To ensure this Ideal pump is free to rotate:- i. Unscrew the central cap. ii. Gently pull the cap out to engage with the shaft. iii. Rotate the cap and spindle. To vent this pump:- repeat steps i, and ii, move the fitting from side to side to allow any air to vent, ensure the cap is...

If you should need the user guide -> www.honeywelluk.com/Documents/User-Guide/pdf/1068.pdf Good luck. :)

Because that 10.30pm on period is not your last time block. Disable any middle blocks you do not need, example: have *block 1* as you start period and *block 6* last time period.

It's no wonder the rads are cold - you have the temp set for 12 degrees 'off' - - ??? make sure the time block periods cover the temp setting with no overlap difference otherwise the low temp setting on the following block will enable. There a six time blocks on the Honeywell cm921 if i...

Burleigh, If you can verify that your central heating pipework system is of the permanent loop type, then a manual by-pass is not needed and can be left closed or even removed. I have fitted many systems over the years with by-passes that you have, i installed them under contract to...

If you have gauge tapping points on your manifold, obtain and connect a suitable gauge then get system pressure running normal then isolate underfloor loop and monitor its pressure separately, this will at least verify if the u/f loop needs attention before looking elsewhere.

I would calculate the total heated sealed water volume and check if the current expansion vessel is sufficient to cope because by isolating the underfloor volume, the working volume would be less and therefore might be within the expansion vessel limits. A larger or additional expansion vessel...

Hifty, your photo shows only the boiler connections - but no valve. A manual bypass would be a pipe with a valve somewhere between the flow pipe (1 with gauge) and c/h return pipe (5) in photo , it would generally be not far from the boiler (low level) maybe, i doubt you have one. There is...

Bypass valve is shunting, check minimal by pass pumped flow rate through boiler and ensure by pass rate is adjusted accordingly, do this with all rads turned off first then try opening furthest rad just enough to test if bypass activates. Good luck

Re quote; I assume that the fan controls that? Indeed, with any air/gas mixtures, air is almost always the 'lead' or 'fixed maintained' starter and the gas is fed into the stream to a determined mixture, the 'ratio'. The same mixing procedure is used on all package-units for example. In...

When the room stat is on demand it will put power to the *white* wire on the 3 port valve. (i'm going to bed now)

The micro switch is wired correctly, is has a permanent (switched) live supply and is activated by the motor when it reaches the end of its travel, so now all you need is the synchron motor to have power from the roomsat which gets it power from the timer. Check the circuit wiring functional...

O.k You've proved the system responds when upping the room senstat, so the function appears correct at least, logic says the senstat is somehow not accurate in its temp response yet a replacement (of the correct type Type 67-040-20) has been fitted. The Temp/cont/module connections are 8 and...

The problem described is similar to having a room stat with no anticipator differential correction. Does the room stat have three wires, one of which is a neutral or a just two (live in and out) ? If three wire (230v) check the neutral for continuity and ohms reading through the...

Auto by by-pass valves are pressure flow operated and should normally be shut, if correctly set they should 'kick in' and gradually open only when any zone valves or thermostatic rad vales are closed or are closing to allow heated water to return to the boiler temp controls - stats, sensors...

@neildee, It is without doubt an interesting dilemma and i have no solution to your problem but i found this older thread from way back in 2009 in which you might find some similarities and food for thought. http://www.diynot.com/forums/viewtopic.php?t=168165&start=0 good luck.

At this point cathabd, for safety and peace of mind, it would be best as was mentioned earlier by twgas, to call in a qualified RGI and have the boiler and all its associated controls and equipment, checked out.

Definitely original Myson Housewarmer, before Potterton etc' - there was a choice of several fires to match the BBU. The shots are very small (200 x 150 pixels) can you get a closer view, if you post a 'thumb-nail' code it should open up to full view when mouse clicked. 800 x 600 pixels...

Here's the forum help info on posting images.. http://www.diynot.com/forums/viewtopic.php?t=129539

The user controls are on the right hand side, there is a vertical slider and a switch. Make sure the timer control is 'on' - check the room stat is on call - set the slider to hi and the switch (for the boiler) to 'on'. A small LED on the user controls will show green after the auto...