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OK. Thanks very much

Thanks for the reply. It's a Salus RT300 Digital Electronic Thermostat. Battery operated. There are two volt free contacts to connect to. The 3 & 4 you suggest is, as you'll know, where the wire loop is. Mike

They've explained it all for you here http://www.diydoctor.org.uk/projects/balancingcentralheatingsystems.htm Do a search on the site/forums next time. Many questions such as this have already been answered. Most of the time the info I need is already available & I don't need to post...

Hi. I've just got a battery operated digital thermostat and need to connect it to my combi-boiler. I assume the two wires, (L & N, it does not require an earth), from the thermostat connect to the terminal inside the boiler casing. I just need to know what terminals I should connect to...

Curiously this is now working, though not perfectly. When I turned the system on again this morning it started. However the pressure dropped right down and I had to stop the system to get it up to 1 bar again. Luckily it started again. I ran the heating for 1/2 hour to make sure the water was...

pressure is just over 1.

Hi. I have a fault with this boiler. No hot water or heating. Error code, (after pressing the appropriate button), is S F6. Unfortunately cannot find the installation manual so cannot find out meaning of code and no joy on net. When I reset I hear the boiler 'starting' but nothing after...

Hi. I have a fault with this boiler. No hot water or heating. Error code, (after pressing the appropriate button), is S F6. Unfortunately cannot find the installation manual so cannot find out meaning of code and no joy on net. When I reset I hear the boiler 'starting' but nothing after...