Getting To Grips With The Killer Heating System
I think it is best to document what I have here first. Engineers have problems and try to solve them. Others have theories and try to prove them.
With any problem you start by writing down what you’ve got.
The Boiler
This is a fairly common Vaillant boiler.
The Boiler
It has been regularly serviced and when I took the house over I found that the control circuit was broken, so a new one was fitted.
I have no manuals for it, as is the case for everything else in this house.
It would appear to be running well.
Boiler Temperature And Pressure
But I have no idea if the temperature and pressure shown are correct.
The Control Timer
This is a pretty standard Honeywell product.
The Control Timer
It seems to work without trouble.
What the boxes underneath do, I know not!
The Downstairs Manifold
The pipes to the underfloor heating end up here.
The Downstairs Manifold
The pipes always seem to be warm when the boiler is on, with the individual zone controllers having no effect.
So in other words the only way to control the heating is from the master thermostat.
Upstairs there is a similar manifold, which is just as out of control. I’ve got it switched off, so I only have heating downstairs and let it find its way up the stairs.
The Anonymous Widower 
[…] I’m certainly feeling better now that its killer instinct has been removed. […]
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