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You would need a vaillant wiring centre as well

Is there hot water coming out of the boiler. Check the pipe that is second from the left to see if it gets hot when there is a hot water demand. If it is hot coming out of the boiler but cold when it reaches your tap, you might have a faulty shower valve/ mixer tap

I'm surprised no one has mentioned Corgi if the subject is getting into misuse of data. Think of all those boilers that were registered from 2005 while they were the regulatory body for gas installers. Then a few years ago they decided to introduce their own breakdown policy. Surprise surprise...

At the end of the day it just comes down to business, like any company they are out there to make money. Boilers aren't like what they used to be and there's a lot more than thermocouple, blocked pilot or gas valve to go wrong. We all seem to forget the curry and **** ups paid for by the...

You need to isolate the water turn on the lowest hot water tap then hold open the temperature/pressure relief valve until the cylinder stop gurgling and water stops flowing from the tap. Then turn the temp/pressure relief valve until it clunks shut, turn off the tap and the cold water back on to...

I think connecting onto a clean system is a little more important. Inhibitor prevents corrosion and doesn't magically make dirty systems clean like some installers out there think

Give vaillant a call under warranty, they will probably replace it. It sounds a little dodgy with such a poor signal and only 4 meters away from the boiler

Has anyone on here had any experience with the nu heat lopro10 underfloor heating as a retro fit to a concrete floor. Just wondering if there was any issues with it heating up or is all the heat lost into the concrete slab

Go into the menu on the 350 to see how good the good the rf signal is between the boiler and the thermostat, it will rate it from 1-9. If the signal is poor and it can't communicate with the boiler the heating will default to the on position. Or maybe move the thermostat closer to the boiler and...

Full unit

How fairly new is the diverter? I've had a few problems of diverter valves going wrong after 18 months. If your getting hot water it isn't going to be the plate heat exchanger.

Personally I'd go for the 837 as it's a lot less complicated and both boilers have the same flow limiter fitted on the cold inlet. The store works by allowing the water to be hotter and then if a blending valve is fitted then it will give a flow rate of 20lts/min with a 35-40 degree temp rise

The actostor can only be used on the 937. Even though the boilers all have very similar components the main heat exchangers have a coding resistor telling the boiler what size it is. The pcb has a code programmed in telling it what boiler it is. So if you try to get an 831 heat exchanger to run...

Is this a new build?

What's he gonna do Dan knock on the door with a cute kitten and hope he gets invited in for a saucer of milk......... Lol

This might not be exactly the best solution but should definitely raise an eyebrow. 1-fit a co detector 2- when neighbours boiler is firing your co detector APPARENTLY goes off 😉😉😉😉 wink wink!!!! 3- call gas emergency service for report of co and fumes As I...

Most of the time the f9 fault is due to a faulty pressure sensor. What should happen is the pump will start and stop for 5 times then it will show an f9 fault. The pressure sensor also acts as a pump proving switch. When the pump kicks in the sensor is looking for a small pressure increase. If...

Fitting a low loss header might improve flow through the boiler and keep it running long enough to modulate down.

Once you turn the cold main off then it will turn the hot off at the same time

Do you have a cylinder or combi boiler fitted?