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The boiler fires when the HC is on. The boiler won't fire when the CH is on. Common to that scenarion is the need for a micro switch to function therefore I suggest that the Micro switch in the CH Zone valve head is goosed. The ticking noise is prolly the teeth of the zone valve synchro...

It's probably not 'back vented'. It may not have a pipe that goes outside or connects into the soil stack above any drain connection to allow air in to avoid the traps being pulled to drain.....

What's the rating of the shower? Does it feed from the mains or from the hot make up tank? When the ambient temperature of the feedwater is down - winter time - then the pressure for a particular temperature will be less. This is due to the shower always consuming it's full amps but...

You prolly left it with water in it and it cracked some plastic bit over the winter when it froze..... I've got that T shirt!

Hi Kofi, I'm thinking you mean it does a proper flush but just does not remove the necessary so you need to wait 'til it fills up and try again and again... I had that problem until I fitted a new bowl with a much smaller 'splash zone' for want of a better description. Now it does it's...

Agile, Surely that would need a very fancy glanding arrangement at each end to get circulation. All the invertory would be at the same temperature so you'd lose the temperature gradient required.... I'm probably missing something though. Stew,

Thanks Nige, I had thought of that. Am I right in thinking that will need a two pole isolating switch which should be fitted by a 'real' sparky to avoid Insurance issues if the place burns down? Stew,

Thanks for that. I'll go do my homework on that.... Stew,

.... So is there a simple circuit I could use to make water flow past the tap ie use a 'T' piece and a return pipe to the bottom of the hot cylinder so I always have hot instantly available? I'm thinking it would need a non return, one way or reducer valve in it somewhere. Would it still...

Nobody has mentioned that if you loosen the radiator connection at each side with the valves turned off, then lift the rad off the wall and swivil it down so the top is now lower than the bottom. You need to take care that the rad does swivil on the stubs and not bend the piping leading to a...

If it's not on the 'Bill of Materials' then you don't get it is my experience.... The Oil Industry make me cynical.

The business I'm in requires that equipment that might need serviced/renewed should be removable without upset to the rest of the kit. I've got full bore valves on both of my Boiler's feeds and returns. It's changing out a rad valve or a Zone that's the Achilles heel. I'd have thought...

Hi Softus, I specified valves each side of my Pumps when the system was installed - nearly 20 years ago now! They still operate/hold OK so it was just a quick change out. The system was drained down 3/4 months ago to allow re-arrangement of the bathroom radiator and I added Fernox after...

I changed out the pump last night, tested it with the over ride switch and it all seemed OK as it got hot on return side of the return zone. Lit the multifuel then sat back and waited until it needed to dump heat. All worked fine and the multi kept the rads fine and warm. Thanks for...

Tony, The lady, I stand corrected on that bit, asked for help as she's having a problem. You chose to say: And then offered no help. That's what I was puzzled about. I'm probably missing something.....

Zippy2007 didn't say that bit - he quoted it! Did you mis-read that, not understand it or just having a go?

Softus, It's got Fernox in it and on bleeding rads etc it's clean and slightly soapy feel so seems OK. I'll change out the pump and revert... Thanks for your help.

It's the same water circulating so no noticeable increase in volume......

My brand new one leaked within a week! The plastic washer/gland was cracked. I found a repair washer kit in B&Q for something completely different which did the trick.

Gentlemen, I have a Multi Fuel boiler and an Oil Fired Boiler each able to run the CH and HW. (Free logs so the Multi makes sense) When the Multi gets hot it inhibits the Oil Boiler and takes over the system via it's own Pump and 2 off Zone Valves. It's worked fine for years but lately...