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Yes it does. Very helpful Engineer from BG came out and diagnosed a failing pump; replaced it the next day as it was a larger type than they keep on their vans. Paid for under a fixed price repair contract which in this instance, because of the type of pump, was a very good deal. Thanks for...

Turned one of the boilers off last night, the remaining one was still working this morning and we had some heat and hot water. But now both the boilers are responding to demands for heat/HW, run for about 10 secs, make a noise like boiling kettle and then return to standby (green flashing...

Well. both boilers locked out again this morning so not CH at fault. I did the test on the reset button, holding down for >10 secs, and got 5 flashes which according to my PCB manual indicates overheating. Going to switch one of the boilers off tonight and see what happens to the other one in...

Thanks for the reply, would there have to be moisture on the electrodes of both boilers for them both to lock-out or would the failure of one make the other also lock-out?

Good point, I'll check tonight. Does the lack of pump overrun/by-pass signal a faulty pump? Thanks

Thanks for the suggestion, would a faulty thermistor only cause a lock-out when the system started because the boilers behave themselves after I've reset them at the beginning of the day? I assume I could trace the faulty boiler by turning one off and seeing if the other one starts in the...

Thanks Glasgowgas. Although I think these indicators are for one of the earlier PCB versions. Mine have only one light which changes between green and red depending on status. The lock-out is a 1 sec flashing red light.

The boilers work collectively on the CH and hot water ie they share the load. I'm going to turn the CH off for tomorrow morning to see if the problem is coming from there.

I have 2 suprima 70 boilers serving the CH and water (megaflo) systems. PCBs (single light version) have been changed in both over the past 2 years, the system was a new build now 8 years old. Both boilers have started to lock-out (flashing red light) in the morning. They start immediately upon...