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If an Opentherm thermostat is connected to the OT terminals of a boiler it takes control of the boiler's flow temperature. This is OK for central heating but no good for HW heating, which requires a flow temperature of 70C or more. This is why HW priority is essential if OT is used.

Which post does this refer to? Here are all the options for a mid-position valve:

I have to disagree. If the valve is in the CH only position and CH is satisfied or turned off, then the valve will stay in the CH only position until either the power is turned off at the switch controlling the heating system, or there is a call for HW. Mid Position Valve 2 of 2 by D_Hailsham...

Definitely not the BSI Kitemark.

Sorry to confuse you; I have attached the manual. Salus refer to pairing as "RF Address Code Setting" - page 9. Just check that both the controller and receiver are set to the same address. You should also test the RF transmission - page 11. Incidentally, the control is not designed to be...

Have you tried re-pairing the hand-held controller with the Salus receiver? Instructions are in the Salus manual.

The silver valve at the front is a V4043 zone valve; I can't read the red one as it's too blurred.

The required size for a boiler is determined by the heat loss from the house, not by the sum of the radiator outputs. The turbomax is a combi boiler (instant hot water - no HW cylinder) so the size of boiler is determined by the hot water requirement. 35kW is a lot. Post a list of what you have...

There is an arrow on the back of the pump showing the direction of flow - it should be pointing downwards - towards the midposition valve. It is possible to rotate the front part of the pump through 180°, so it "looks right", but most installers don't bother. As for your noise problem - find a...

The sludge which causes the blockage is slightly magnetic. If a magnet is attracted to the air separator (that's the small cylinder in your first pic), which is made of copper and therefore non magnetic, it's an indication of a potential blockage. It's also sensible to checkthe pipes attached to...

NewBuildInspections seem to be relying on out-of-date second-hand information! Why don't they go to a reliable source? I wouldn't trust them to inspect anything. Honeywell are not much better!

According to the current Building Services Compliance Guide (2013 Edition with 2018 amendments) that only applies to dwellings with a total floor area greater than 150 m². A single zone is acceptable if the total floor area is 150m² or less.

How will that work with voltage-free switching?

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Condensing boilers were made compulsory (with few exceptions) to reduce the amount of CO2 produced, not to save the user any money. They are more efficient than a non-condensing boiler, due to their improved design, so a condensing boiler still produces less CO2, even when not condensing.

Has your proposed installer actually visited the house to see what work is required, or is it a an instant quote via the RBHM website? Was a heat loss calculation done to ensure the correct size boiler was quoted? You say you live in London but the proposed installer is in Bagshot, which is...

The installation instuctions for the T4R say this about using the OT connections: OpenTherm® compatibility is offered only by the Receiver Box. The Thermostat will control heat demand as normal but will not show OpenTherm® specific boiler data on the display - Refer to the boiler instructions...

My mistake - gasguru put me right.

Darren Do you realize that the manual you show is not the correct one for your boiler? The PCB does not have a terminal block for the pump, while the manual shows one. It's proably because yours is a different version of the 418 boiler. If you can provide the GC Number (on the data plate) we...

Did the DT92E, CS92A and the programmer (?ST9420C) all come together as a kit? If they did it's called the "Sundial RF2 Pack 3". The wireless receiver for the room and HW cylinder thermstats is built into the programmer. That would explain why there is no green light on the CH side, even thtough...