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I got some 90° 0.75 4 core to connect the Honeywell. I found in the Vaillant manual that at least 0.75 should be used. The Honeywell seems to be working well. Thanks All! Does anyone know how I can move this post to the Plumbing section?

I meant to put in the Plumbing section. Posted here by mistake. If the forum's admin notice this post, can they move it please.

The spout on the roof's air vent is 85mm o/d which is 10mm smaller than the i/d of this type of duct bend. Are there adapters available? Seems daft that the the roof vent spout is a reduced size. The house is a 2003/04 build.

The boiler is a Vaillant combi Turbomax Vuw connected to the mains via an isolator switch fused with a 3A. I'm going to fit a Honeywell wireless T3R. Is it acceptable to use 0.5 3core cable for a cable run of about 2m?

I ran fresh cables for the boiler's mains and thermostat, the thermostat temporarily on the kitchen top next to the kitchen cabinet the boiler live in. Last night the boiler seemed to run better, the gas burning light was on less in my opinion. I sat a greenhouse thermometer next to the...

This one. If I were to connect only the neutral and test to unconnected (at both ends) live or switch live and still get a voltage, I'd have to agree with you about induced voltage from another cable.

What is your preference for this type of thermostat product when using it with a Vaillant combi may I ask?

The Honeywell T3r seems a good choice.

Fault identified! The 3 core + earth cable run between the boiler and wall thermostat. Using the blue as neutral, with all wires disconnected at the Honeywell, there's around 120vac between the unconnected wire/neutral and unconnected wire/connected wire at the other end when I connect to the...

Why should there be 120v between Vaillant 4 (SL) and neutral at the Honeywell when the wire is pulled out of its terminal? Can the thermostatic circuit in the Vaillant work correctly without the neutral connected to its terminal 5?

I found the issue having looking at the Vaillant pcb ! Honeywell 3 is connected to Vaillant 3 Honeywell 1 is connected to Vaillant 4 The neutral in the Honeywell 2 is connected to the switched side of the isolator.

This gives the wiring info. p20 Is it necessary to take the permanent live and neutral for the Honeywell from the combi's pcb terminals? Could they be taken from the switched side of the isolator switch?

Basically I want the Honeywell and Vaillant wired correctly. Is Vaillant 4 or 5 the switch live? Presumably the remaining of three being the neutral!

This picture of the boiler's install manual indicates the relevant terminals on PCB so I'd need to ascertain which connect to terminals 1 and 3 on the Honeywell T6360B.

I concur with what you say based on what I've researched on YT. It seems to me that the connections for the thermostat at the boiler need checking.

From what I've read, terminal 1 in the Honeywell thermostat should be permanent live and terminal 3 should be switched live. My multimeter says they are the wrong way round. I've looked at the isolator switch wiring for the Vaillant Turbomax Vuw combi boiler. There's a 4 core into the boiler.