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Great job Chris, I'm glad that you were able to resurrect the old post and give it some new life - the text is a real improvement on the old version. Also, thanks for the compliment. Though, given the number of mid-position valves in use, it's surprising that there isn't loads of...

Hi Guys, It's been quite a while since I last visited this forum, and was surprised to find that the old motorised valve posts were still of some use. Sorry not to have updated the image links in that thread (after closing my account with the ISP that hosted the images), but I didn't think...

It's perfectly normal for the valve to remain in the CH position when everything is switched off at the controller. Whenever the valve is in the mid-position or beyond, an internal microswitch connects its grey wire directly to its motor. The controller's DHW Off terminal applies 240 Volts to...

Paul, As mentioned above, your thermostat's Chrono-Proportional control simply adjusts the duty cycle (On to Off ratio) of the boiler, in proportion to the heating demand. The period of the duty cycle is set to 10 or 20 minutes with DIP switch 3. I do not know the actual parameters used by...

The problem could be caused by a bad/intermittent contact within the thermostat. Sliding the DIP switches back and forth a few times (to clean them) or cleaning/tightening the battery holder contacts might help. Are you using the thermostat in "Chrono-Proportional" or "On/Off" mode? In...

chocdrop's picture: Is the pump actually circulating the water? Its impeller may be loose on the drive shaft, and the water could be circulating mainly by convection currents. Is the CH return pipe to the boiler hot?

ALANKING, The problem may be due to your boiler overheating. If your boiler has an overheat thermostat connected in series with the thermocouple, then this may be just doing its job - interrupting the current to a coil, within the primary gas valve, whenever the boiler overheats. The coil...

DIYIdoit, The programmer's CH ON switch contacts probably welded together at the time the fuse blew, and terminal 4 has now become a permanent LIVE. This would be confirmed if terminal 2 (CH OFF) fails to become LIVE whenever the central heating is turned off at the programmer. So, it...

DIYIdoit, You're welcome! chrishutt, Some time ago, I realised that the diode is orientated the other way around in Honeywell mid-position valves, but as I would have had to alter a whole sequence of sketches (used in THIS thread) I left it as it was. In any case, the diode's function is...

The Siemens RDD10.1 is battery powered, so does not require a Neutral connection. You just need to connect programmer's Switched Live (CH On) to Q11, and connect Q12 (the normally closed control output) to the white wire of the 3-port valve: (Rectifier orientation now corrected)

PhilWis, This table, which summarises the information provided in Mandate's post above, may be of help when checking the voltages of the wires to the 3-Port valve: You may be able to do the check with just a mains test screwdriver. However, when the valve is in its mid-position the...

Perhaps the leak is being balanced by let-by from the meter control valve. Hence, no net pressure change in the soundness test.

The Worcester Greenstar Highflow 440 RSF is suitable. It's pictured under a worktop in the technical brochure: http://www.worcester-bosch.co.uk/index.php?fuseaction=site.viewFile&id=122544

:D Very good PVM. You shouldn't have any problems. It's the manufacturer that has to be seen to be conforming to the EMI emission requirements, set by yet another pile of EU directives.

It could also be that the effectiveness of the boiler's mains supply filter, intended to suppress electromagnetic interference, would be reduced if the pump's neutral and earth were taken from the wiring centre, as part of the filter would be bypassed.

They might, but heat would still be lost from the pipework to the radiators.

One of the conditions for a conservatory to be exempt from planning permission is that it must not be permanently heated. So, any conservatory radiators must be connected as a separate zone that can be isolated from the rest of the central heating system.

The original backplate probably split because the plumber screwed the tap in too tightly - trying to get its spout to point downwards. After fitting a new backplate, put plenty of ptfe tape on the tap's thread before screwing it in. If the tap doesn't point in the right direction, when...

sarebearmeeks, If you cannot get a pilot flame at all, then this could be due to air in the pipework to the boiler. You may be able to purge the air by repeatedly trying to re-light the pilot. This could take many attempts, though, because pilot burners have such low gas rates.

turbuch, You may find the comments HERE of interest.