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Probably to accommodate the 100mm between insulation and ventilation.

The fuel. As you probably aware. The fuel reg plate is Top- hole Grains and second peas & Beans. Are there any larger pieces that could jam and cause a bridge ??

We are back to schitt fuel again. How big is it??

Is there any flow to rads when heating is off but there is water demand .?

Yes. Needs removing though.

Has the boiler overheat stat tripped.. Manual reset

Which Heatslave do you have.

Put the fuel regulator plate back to the top or second hole and find out !!!

Use ordinary ply. The fookin ceiling will have fallen in before it de laminates.

A couple of holes for 15mm pipes through the web should cause no concern if the beam is correct size. Use a cordless on a low speed and loads of pressure.

You wrote " It's difficult to see the wires properly in your photo, but some of the wire connections appear somewhat unconventional. There seems to be a link between terminals L, 2 and 5 and it's unusual to have links between L and any of the other terminals (eg L, 2, 5)" It is normal practice...

The H37xl has volt free contacts.

If you have a Boss on cylinder its an easy fit.

You would use an immersion heater in summer. Not a cheap conversion .

I have both pcb surplus to requirement due to retirement at very cheap price, If you are interested.

It can only be the fuel. Is it Black shiny and brittle .....does it look right ?? After 40 years you should have a good idea. How much ash are you getting per fill compared to what you put in. Fill the hopper and note how many buckets it takes. Save what comes out as ash and unburnt crap to...

I have never heard a coal merchant agree that the fuel is crap it is always a battle. They will ALWAYS say.... "Nobody else has complained" Or Has a problem. I remember one merchant who was selling coke that would not even light without a pile of kindling. It was Sewage filter bed coke which...

FFS the wiring is simple. Start at the burner terminals and work back one component at a time until the missing voltage is found. Ok I will make it easier.........Do you have voltage at the Temp pcb in and out? My money is on the pcb!!

Ask yourself "What is Ash and Clinker"?? Answer. It is unburnt crap in the fuel. Clinker forms due to the high temperatures in the fire bed, which will not be present .

Each zone must be piped from the common flow and return to prevent reverse circulation. Its not fookin difficult to remember.