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Gravity through an indirect coil? - coils are intended for circulating pumps!

12 metres sounds good, when the work is complete you should be able to turn the boiler stat higher without any pilot interruption. Good luck

Yes, that would work although an effective bypass loop would need several metres of pipe run to dissipate excess heat rather than too close to the boiler with trickle valve between flow and return. The best place to dump heat would be in the system itself, either via c'h or cylinder coil...

There was an extra permanent live terminal on the Myson Ranco boiler stat especially for the pump overrun - check it out. The rumbling will happen for a short time after full fire on an S plan when both zone valves a closed if there is no bypass. Indeed, the boiler stat set at 2.5 or 3...

I agree with comments on Satronic box purge times (or for that matter any othe make of control box) although box specs' vary, the boiler and control box must remain 'strict-to-spec' matching per burner manufacturer. Photcell detect period is strict to the box and does not affect any timings...

Do you have a manual? http://www.aqualisa.co.uk/site-search/?searchtext=aqualisa%20aquarian&searchmode=anyword&index=Downloads I would check the commissioning procedure, especially the parts of aligning the ports on assembly, the cam tooth positions, also check for reversal of the ports...

@justino, some notes to guide you in the right direction. The part you require is a normally closed switch and breaks (opens) at 275 degrees F. (or 135c) It is of the auto reset type, it is listed as a "spillage switch". The stat is held by two small screws and has spade type terminals for...

On the electrical control panel of the boiler there is a link on the multi-pin plug which can be removed and allow to connect external controls (clock, room stat etc). Connect only controls which have volt free or 24v switching.

First, with your multimeter, check for continuity from the room stat output to the synchron motor of the ZA5 zone valve. If the wiring appears o.k, then with the cover off the ZA5 and the room stat calling for heat, see if the synchron motor attempts to turn (with the manual lever on auto...

The Teddington gas valves for the AGA are available for about £150.00 inc VAT - it will need a RGI to set up and calibrate in situ with system running. The by-pass screw of the original control must always be retained with the appliance as they vary. Your RGI will know what to do.

Wiring fault, check functions of single channel compared with two channel programmer, you currently have one channel controlling c'h and h/w where they should be separated. A simple mistake and easy to correct. :)

It has been good gas fitting practice for decades (and per IGE recommendations) to slightly oversize pipe diameters (even as much as 20%) to allow for future installs and any supply pressure problems without having to rip out and replace for every further additional appliance. Parallel internal...

There is a technical advice phone number, all explained in the manual. http://www.creda-showers.co.uk/

That coil temp control setting can be increased above the desired cylinder temp' because it is the cylinder stat that controls the cylinder volume temp, higher output (coil) temp will give a quicker cylinder satified temp.

Your fire looks like or is very similar to the Magiglo 'custom' 16 (L16) The broken part is called an 'aeration tube', small aeration tubes have one hole in each face (= 3) while larger aeration tubes have two holes in each face (= 6) depending on the fire model. Use the link that...

Check that the manual over-ride levers on the zone valves are set to auto otherwise the valves will not function from the room stat signals.

Most stainless steel blends can be soldered using killed spirits as a flux. A big copper soldering iron Iron gives best results (less instant heat loss) and better than flame because of less oxidation. As always, surface must be fully prep'd clean, you'll find the solder will run quite...

Even though the pump has auto air bleed there may be air elsewhere in the system and if so would render the auto bleed useless as a function until water feed or supply is re-introduced and allowed to prime the pump and system. I would check this first before attempting other solutions. The...

Theoretically, the boiler 'control stat' is normally wired to the control loop of the burner control box and on each re-fire via either timer or control stat demand the burner control would repeat its normal sequence automatically - however if the boiler 'limit stat' should ever activate, for...

The time blocks of the cm921 are very flexible, here is one method to equivalate to brute03's old boiler setting of 6am until 7am morning and 6pm until 7pm evenings. Set period 1 to start 6am 'active' at say 21 degrees. (this will run until period 2) Set period 2 to start 7am 'active' at...