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If you turn on a hot water tap and let it run, then if you turn off that small grey valve and the water stops flowing from the tap, it will confirm the grey valve is *NOT* the filling valve (sorry) If so you need to obtain a flexible filling loop and connect one end to a water supply and the...

The small round grey handle is indeed your water inlet to the boiler and must be turned anti- clockwise to open, also at he same time manually press the small brass plunger button above on the same pipe. - 1 bar on the pressure gauge will get you working. Close grey valve when complete.

No auto bypass, cut and pasted from manufacturers instructions --> "Where a pair of two port valves are used, a by-pass is necessary. The total length of the by-pass circuit taken from the boiler connections should be greater than 4 metres of 22 mm pipe. It should be fitted with a lockshield...

1. With cam at rest (parking position) set push rod gap at 0.2"mm then fasten rod locknut. 2. Slacken screws (5) so that micro-switch is slightly loosened. 3. Now turn cam clockwise (per diagram) so that the 0.2mm gap that you have just set becomes wider to between 5-7mm gap (hold it in this...

The diaphragm is indeed the prime suspect, you will find the old diaphragm stretched/distorted. Stuffing box should be o.k but ideally should be replaced. The two switch actuating spindles can be checked for free movement gap measurement while the assembly is removed, the gaps should be o.k if...

The vertical zone valve could be wired to turn off CH demand to the two zones from a standard two channel programmer (HW + CH) - this way would leave the the upper two zone valves independently controlled via separate upstairs and downstairs stats.

@ Kieran42, The new TP5000si you have is a programmable room thermostat, it has a digital clock incorporated into it. You still have an existing functional programmer installed in your system - so you really need to choose which one you need then disable the other because you cannot run a...

Live into A, on demand the room stat switches live to B which goes to boiler.

Do away with the neutral by disconnecting or isolating, just a live in and switched live out. Honeywell DT90 has volt free switching, can use the switched off position to control temp set-back or similar, i've use it for pump overrun, frost etc'. The earth wire also is not required and can be...

If you have upturned the rad and obviously assuming you have kept the flat side of the rad to the front, the input flow diverter connection will now be on right hand and at the bottom - *this has to be the incoming flow to the rad* via a TRV ..... your flow connection pipe appears to be on the...

For reference and to assist with replies for explaining wiring etc. Install manual for British Gas RD1 gas boiler. http://idealboilers.com/installer/wp-content/uploads/sites/2/2013/08/157022.pdf regards

The standard Y plan uses a Honeywell V4073A (3 position) valve and not a 4044C (2 position) valve you say is currently fitted and which is used in the sundial W plan (fully pumped single zone at any one time) - it has three wires not five like the V4073A.

"Identify diverter position" The factory fitted diverter can be identified by a ‘diaframma’ sticker found on the underside of one collector. The radiator must be hung with the diverter at the bottom. If this sticker is missing simply look into both collectors, one will have a clear water way...

As an example, Honeywell evohome have adapters for many types eg: Radiatorkraan. You would have to Google search on your own behalf and with a .pdf file viewer - some of which have text translation to english (if required) abilities. Here is one such link...

It looks like a Plieger - a dutch company. Google for -> Plieger radiatorkraan

@ barki something to consider... In your situation the fitting of a de-aerator into the fuel line is essential because it is common knowledge in the industry that the air formation is a continual and *natural occurrence* when lifting fuel from a lower level. regards

Some Caleffi valves have a threaded insert adapter (spacer) that fits over the white valve nut, inspect the good working valves to compare and check if these are missing otherwise without them the pin will be always pushed down and water flow shut off.

mrbrunes, Your link to the Calleffi pdf file shows how to reset the valve head. Perhaps you overlooked it yet it is easy to follow. Put blade in valve head slot to reveal lower rim, hold the rim and turn the valve all the way to reset. Most Calleffi heads have similar setting adjustment. You...

@ Waldovr, your are right to suspect the bypass setting. Re your quote:- "There's another (automatic) bypass in the system" You cannot have two valves as they will counteract each other. Disable, isolate or remove the existing system bypass valve and let the boiler function on its own...

mrbrunes, Caleffi trv's have various interchangable heads (as many as 5 types) which is very impressive, however it depends which model you have fitted. One popular model has a screwdriver blade slot on the number setting rim where the head can be locked in one position or even locked in high...