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The top pic shows a wheel head valve. Turn it clockwise to reduce the flow through the radiator. This will reduce the temperature of the rad. The lower picture show the lockshield valve, which is used to balance the rad, i.e make it give out the correct amount of heat when full on. You really...

The house (mansion?) must be extremely large. I do hope the installer carried out a detailed heat loss calculation and didn't just assume that the old boiler was correctly sized.

The reason why there are separate switched lives for CH and HW is that the boiler can use weather compensation and Opentherm thermostats. Both of these features will adjust the boiler's flow temperature acording to demand. So when its freezing outside, the flow temp will be 75; but when it's...

If your not satisfied with the MA's then sack them.

If you, and the other occupiers, are leaseholders, have you thought about getting together and purchasing the freehold of the block? You can then form a management committee to make any decisions and appoint your own managing agents.

S codes are status codes, they say what the boiler is doing at that time. Faults are shown as F codes. The boiler has not been turned off because of the S07; the boiler has gone into pump overrun for 5 minutes because the boiler has been turned off. This will happen every time it is turned off...

A rule-of-thumb formula like that might have been acceptable when gas was 1 old penny a therm and nobody cared anything about global warming. But in today's climate (pun intended) a proper heat loss calculation is essential. Use the Myson heatloss manager to do a "whole house" calculation" by...

Forget what I wrote.:oops: I thought it was a standard hex nut connecting the elbow to the white pipe; I didn't realize, until I enlarged the pic, that the pipe is plastic.

Have you tried tightening the connector? Turn clockwise looking from the rad.

I agree. So why the connection to HW OFF on the programmer? It doesn't make sense. I suggest you park the wire (yellow with red sleeve) in a terminal block and see what happens. Apart from that, the Novice is correct: Link L to A and D; 3 to E; 4 to B

There is a wire connected to terminal 1 (HW OFF), which is only necessary if you have a Y-plan, i.e mid-position valve. Are you sure it is a vented HW cylinder? A pic of the cylinder and the two MVs would help

Provided the pump is sized for the index radiator when both zones are in operation, there will be no problem. If the zones are running separately there will be a separate index rad for each zone; but when both zones are running the index rad is whichever of the two index rads has the greater...

I don't know how the Sundial wiring centre is wired behind the circuit board; but I can understand why the link need to be cut. Time clocks are one-channel devices; programmers two-channel. If a time clock is controlling both heating and hot water there needs to be a switched supply (presumably...

Remove link L1 (make a note of which terminals it connects) and see what happens. Then, if you still have problems, you can easily replace it. Woops ! I'm thinking of the Drayton wiring centre, which has removable links. The Honeywell one has soldered links. You have a programmer, not a basic...

Test for leaks are usually done with a lit match or taper. Most of the leak consists of air so the concentration of dangerous gases is very low and could be missed by an analyser. In any case the Benchmark Service Record does not ask for any test results, only whether the "Energy Effiiency...

Was it the same enginer as your mother has previously used (or from the same company)? If not how did your mother find the engineer? You can always check the engineer's status on the Gas Safe Register web-site. How would you know what tests should be carried out and what the correct results...

Was you mother given an invoice showing the date, work done, and price etc. If so, this should be sufficient to show that the boiler had been serviced.