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Sounds like there's a wire missing (HW Off) between thermostat and programmer. See http://lp522guide.tripod.com/sitebuildercontent/sitebuilderfiles/lp522guide.pdf and check that the wiring is correct as first step.

If the problem only affects one rad, you might try a 'cheap flush'. Even if it doesn't do any real good, it should give some indication of where the problem is and how bad. (It'll work best if you have a pressurised, sealed system, OK if you're on the ground floor with an F&E tank in the loft...

If the Magnaclean problem occurred exactly as you described, I suggest you contact Magnaclean directly. Chris Adey is always VERY keen to listen to reports and suggestion about the product. Call 01242233702 on a weekday.

OP was referring to a DHW cylinder. Most / all come with male and female bosses, in a standard (BS?) arrangement with male bosses for the coil connections and female for the DHW outlet. However, manufacturers (eg. Albion) will supply whatever bosses you want - male or female, in any location...

You need to understand the difference between 'illegal' (ie. against some Law or Regulation) and 'very unwise'. If you, as a CORGI registrant, work on a gas system in any way at all and at the end sign it off as 'safe' and complying with whatever regs apply, then YOU are ENTIRELY RESPONSIBLE...

Well.... HAS the OP actually checked the polarity yet? Given the sequence of working boiler, electrical component and wiring changes, followed by non-working boiler, I'd have thought it was a racing certainty!

Another thing to check is whether there's a 'hot loop' with a pump which re-circulates water around the DHW pipework and back to the cylinder, to ensure that the taps run hot quickly. (Without circulation, the water in the pipes cools down and the tap has to be run for a long time before the...

Where's the new meter location? If the distance from the meter to your appliances has increased a lot, the gas pressure available may not be suficient for 'big hitters' such as combi boilers. There are many examples of meters moved out of flats down to street level and combi boilers that...

Virtually NONE of the syphon type undo as such (the Dudley Turbosyphon is the main exception). The others are held in place by a nut on the OUTSIDE of the cistern (visible in the case of a low-level cistern, hidden in between the pan and the cistern in the case of a close-coupled WC. SOME...

The wire colours from the cylinder stat are NOT a dependable way of finding out what they're connected to inside the stat! Take the cover off and look!

Absolutely right! I got a call from an Atag SHR15 user who'd had the thing serviced by the installer for 6 years or so - no problems. Then the installer stopped doing domestic work and the customer took out a BG however-many-stars 'service' contract. For a couple more years, BG didn't (need...

It a 'plume kit' and there an offset clip to hold it in place. Two clips would have been better. What problem did you have in mind?

Any half-decent High Efficiency boiler (combi or not) should modulate automatically down to under 10Kw, if necessary. The better ones even modulate the pump as well as the burner.

If you mean Turbomax Plus 828/2E, with the electric actuated diverter, yes. But don't forget to isolate and drain the boiler first!

If it's just the pump running and not the boiler as well, it's unlikely to be a problem with the switches in the Zone valves. Unusually, none of the Icos heat-only versions seem to have a 'pump live' connection on the boiler, so the pump SHOULD be energised off the same terminal in the wiring...

TRVs are NOT a substitute for a room stat. Without one, even with all the rooms warm and all the TRVs closed, the boiler will continue to run, switching on and off by its own thermostat - complete waste of gas! Part L1B of Building Regs requires TRVs AND a room stat for each zone.

Of course you're right about what the standards say about sleeve sizes. But I still can't understand what logic applies to having a HUGE gap between sleeve and pipe.......can anyone enlighten us? (In practice, I reckon it would be safer to have 28mm copper sleeve around a 22mm gas pipe...

Sounds VERY much like a broken heat exchanger. Common problem, especially on early Response models. Like someone said: DON'T try to use it! Also, bear in mind that the repair time for changing the HX is probably more than 3 hours (well - that's how long the last one (of 4 altogether over...

Do you want an installer? or a maintainer too? If the former, make it worth my while and I'll go and stay with my mum (in Maidenhead) for a couple of days!

Huh??!! This defies explanation! If the washer is compressed between the flat flange and the tank wall INSIDE the tank, NO leak can occur. If it's on the outside, OK - no leak can occur between the tank wall / washer / backnut BUT it will CERTAINLY leak along the threads inside the...