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The CM927's relay box requires two lives. One is to power the relay/receiver itself, the other is the live which when switched, switches on the heating. In mine, I split the live into two with a terminal block with the existing live going in one side, two cables coming out of the other...

Honeywell CM927 wireless stat or the fixed one is the CM907. Good piece of kit. Will do what you want it to. Will work fine with your system. You can get the CM927 for about £90 on-line. Should be same price to fit as any other room stat. If it's more, the feller is taking the micky.

A wall thermostat, no matter how evolved, programmable or whatever, is basically just a switch which allows live mains through it to turn the heating on when required. There is no reason why it wouldn't be compatible with your boiler. Where to put the stat is another can of worms. Some...

You can get the CM927 stat online for about £90 delivered and fit it yourself quite easily. Many people have asked how to fit these stats, so do a search in this forum if further details are required.

Timer: Honeywell ST6400c (£30 from eBay) Stat: Honeywell CM927 (~£90 online) I have these controling my Ch/HW, except I have the older CM67 stat. Very flexible, very controllable. Honeywell make good kit IMHO.

Thanks for the info. Are the pumps in the Vaillant 600 series boilers self modulating? I have to admit that I'm a bit put off by the idea of a system boiler as there are more manufacturer/boiler specific parts to go wrong in them and more chance of me requiring a tradesman to come in and...

Are the 400 series seriously lesser quality? That's disappointing as I was thinking that a 400 series Vaillant would be a good heat only boiler to replace my GW Micron with if it gave up the ghost.

All my TRV's are bi-directional :D Read my post properly ;)

Firstly, if you have TRV's on all the rads, don't bother with the effort of replacing one TRV with a lockshield valve, waste of time. Just take the thermostatic head off one of them, preferably the one which is in the same room at the room thermostat. The bouncing is most likely caused by a...

Also, have a read of this regarding wiring harness and electrode needing cleaning and gap readjusting (only the 70/80FF microns have a double pole electrode as far as I know). http://www.diynot.com/forums/viewtopic.php?t=34085&view=next

Not sure if this will help, but here's the fault finding paperwork for the boiler PCB. http://www.2shared.com/file/4330072/bfdce4a1/Pijnenburg_PCB_304050.html

My folks have a Glow Worm Fuelsaver F which is over 20 years old too. They had problems with the boiler short cycling all the time, so we took the rads off and flushed them out with a hose in the garden, giving them a bash with a rubber hammer. Put them back on, Fernox cleaner in, run for a...

Wilo pumps aren't as tolerant to filth in the system as Grundfos pumps are and will likely fail if the water isn't kept clean. For the effort of putting in a new pump, and the relatively small cost, I'd personally replace with a grundfos and know that I had a good pump installed. Have a...

You could try connecting a hose to mains cold water and fit to drain point and fill from the bottom up, if you see what I mean?!

Might want to turn the optimisation off unless you want your heating to come on four hours early ;)

I've got a micron 50ff and I had the PCB go on it. I knew it was the boiler PCB as it's located in our utility and the room stank of burnt electronic components. If it is the PCB that's gone, then you need to change the thermistor at the same time as these fail and tend to take out the PCB...

I have a Honeywell CM67 (the predecessor to the CM927) and I have put a CM927 in my Dad's house. Both are very good thermostats, very controllable and configurable. Both have proportional bandwidth adjustment, which is what you speak of, plus many more options. Download and read the installer...

I installed a honeywell wireless room stat for my sister and she had exactly the same problem. I never got to the bottom of it and ended up having to take it out and wire the old one back in. I wired the exact same wireless stat in my own house and it worked fine. I know this is of no help to...

You can't learn from someone elses mistakes can you? Never pay someone to do something you can do yourself. :wink:

Cleaning up your own mess is all part of the Do It Yourself package :D