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The thermostat does not have on and off times as such, only times at which the set temperature changes. In effect it can be made to be on and off by, for instance, setting period 1 to 20C at 7:30 am and then period 2 to 10C at 8:30am. You can also disable individual time period changes so that...

With a 3 way valve, your wiring should be to the Y plan system. Check to the Honeywell wiring diagram: http://www.honeywelluk.com/Documents/All/pdf/940.pdf

So you need wires from L and N at the boiler terminals to L and N of the receiver and then connect A and B at the receiver to terminals 1 and 2 at the boiler, as per the upper figure 'Room Stat' connection. An alternative is that you can take the L and N from the Switch fuse unit that supplies...

The connections at the Towerstat receiver are: 1 – Neutral input 2 – Live input 3 – Common input 4 – Normally open output On the 927 receiver, using the wires from above, connect: 1 to N 2 to L 3 to A 4 to B

I think you will find that the third combination will work. That is grey to A and brown to B, although it doesn't matter which way round they are connected. The blue will be neutral, which is why you blew the fuse.

Or quite likely it’s seeing an open circuit, which results in an indicated temperature of -60. Try disconnecting the external sensor at the boiler to see if it still indicates -60.

The VRC400 is not designed to be used with a separate thermostat, so it is not very clear how the system is supposed to work. Maybe the thermostat was added when the VRC stopped working properly? Have you looked in the external sensor unit to see if there is any evidence of corrosion or...

It sounds like it is wired incorrectly. The contacts of the DT92 should be in series with the CH output of the programmer so that you only get a demand for heat when the programmer CH output is ON and the thermostat contacts are closed. Were these the existing controls before you had the new...

Heatmiser do one: http://www.heatmisershop.co.uk/epages/Heatmiser.sf/en_GB/?ObjectPath=/Shops/Heatmiser/Products/%22PRTHW-W%20Kit%22

Indeed. I was just wondering why a ‘conventional’ thermal store system, as I understand mine to be, which does give some control over CH temperature would not do the job. It sounds like the OP has no room thermostat control so is relying on TRVs and manual adjustment of the flow temp. If so, I...

I have a thermal store system which uses a mixer valve on the DHW output to reduce the HW temp by mixing with mains cold water. I run the tank at 60-65C, which works fine. This system does allow you some control of radiator temperature. Varying the tank thermostat varies the radiator temperature...

The Domestic Building Services Compliance Guide (2010) requires the use of a room stat and TRVs - unless you are just replacing a component (eg boiler) of an existing system, in which case you don't have to retrofit TRVs. The thermostat will turn your heating on and off. Not quite the same as...

Does the heating switch back on if you increase the temperature on the thermostat? What model of thermostat is it?

Have you set the mode switch to AUTO? As has been pointed out, a programmable thermostat does not turn your heating on and off like a programmer, it varies the temperature through the day. So if you want the heating off during the night, set the temperature, for example, to 12C at 10:30pm and...

As Paul_C says, the voltage at the fault will rise to approximately half the supply voltage due to the action of the potential divider formed by the earth fault loop impedances. Prior to the faulty circuit being disconnected, there will be a touch voltage of approximately half the supply...

The major part of the feed-in tariff is the generation tariff which is paid whether the power is exported or not. FIT generation tariff for PV < 4KW starts at 41.3p per KWh with an additional export price of 3p per KWh. The electricity exported may not be metered at all. The FIT rules allow the...

Connect the Towerstat as per the volt free switching diagram on page 10 of the Towerstat manual (link wire removed). Connect ‘Live from load’ to boiler RL (X2 terminal block), ‘Switched live output’ to boiler RI. Also connect live and neutral to the Towerstat from CL and CN terminals. See...

What wires do you have at the thermostat and which was connected where on the old thermostat?

May be thinking of this: http://news.bbc.co.uk/1/hi/uk_politics/3735928.stm

Have you investigated your county library online? I can access BSI standards via the Lancashire library website, just using my library card number.