Coal fire back boiler

[Michael Breen]

I have moved into a house that has a Firemaster High Output Back Boiler (BB) and oil central heating.

Everything was working fine until I noticed at weekend when fire was lit the hot water cylinder did not heat but pipe running from back boiler to the cylinder was roasting (couldn't put my hand on it).

When I open the damper above BB and switch pump on the radiators heat just the water cylinder doesn't heat.

The oil central heating still heats water but would like BB to do the job too.

Any ideas?

 

[SimonG]

Blockage or air

 

[Michael Breen]

Can a DIYer fix it?

 

[DaveyHep]

That would depend on the DIYer.....but if you have to ask the question......
Presumably you've already bled the radiators....yes ????
Other than that - get somebody in.

 

[Best]

Don’t light the fire until you get that resolved!
Heating system could be partly out of water if it has the flow pipe to cylinder at a higher level to the rest of system.
Or blockage, or airlock, but that would raise suspicions the system is badly installed if air.