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is there a balancing/gate valve on the return pipe from your hot water cylinder?

could be air in the pump possibly - try venting that first

it'll probably cut out quicker on HW only as less space/ways the heat can be given off so it'll overheat quicker Sounds like a boiler stat failure As you have an overheat interrupter this will be open circuit (on continuity) when the fault happens.

check a demand for heating at the boiler

If the pilot is alight, then surely it's not an ignition lead fault? sorry have just realised that this boiler uses same electrode/ht lead for sparking and procing/rectifying :)

So pilot stays lit now? Boiler fires up And after a short while it goes off/pilot goes out?

sounds like a solenoid problem let us know what your gas engineer did :)

let us know what happened :) One last thing before you do - try it again in both modes - does the orange bulb definetely light up?

orange indicator bulb means a flame is detected could be second stage solenoid problem call out a RGI

sounds like an ignition problem. Need a gas safe engineer to look at it and fix it

so a red lockout indicator lights when the boiler goes off?

so it ignites and the orange indicator bulb lights up? But then it shortly goes out? (doesn't reach full gas rate) sounds like the second stage solenoid is faulty then, but things need to be checked by a RGI

did the rust around your flue affect your flame picture John?

could be a solenoid problem - this boiler has 3 or the flame is not being detected can you hear or see sparking? does the burner light on low gas and stay on for about 45 seconds? (does an orange indicator bulb light on the panel?

what's the water pressure on the gauge readiong?

I think if it is the fault and it seems to be, the thermistor will usually only be faulty when hot - it may go to infinity reading and cause the boiler to shut down again

how would you find an intermittent fault if it was the APS faulty - must be a b*****d :cry:

ok :) did the boiler fire up when turned off and on again but go out again after a short period of time again?

ah ok - does it have a high resistance reading across the pins?

was this the overheat thermistor that you changed?