On 28/06/2020 20:46, Mike McLeod wrote:
On Sun, 28 Jun 2020 20:24:41 +0100, John Rumm
wrote:

On 28/06/2020 19:46, Mike McLeod wrote:
Just stopped working! No hot water or heating. Just won't fire-up for
some reason.

Worcester Greenstar Heatslave 18/25 oil-fired.

Got power to the controller board; no fuses blown. Any suggestions?

Start by checking that you are getting a call for heat right through to
the boiler. That will prove that the programmer, stats, and valve
microswitches are doing their stuff.

If by "boiler" you mean the actual burner, I can't get access to its

No, just the call for heat to the boiler's input terminal as a starter.

i.e. n point diagnosing a problem with the boiler if its actually a
problem with the controls external to it.

Is the pump controlled by the boiler, or is it powered up from the
external controls?

--
Cheers,

John.

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