I have a Halstead Best 60 boiler which is less than two year's old and has suddenly stopped functioning. Initial investigations showed that the 2A inline fuse had blown. Replacing this has got the pump going again but the boiler still fails at the first hurdle i.e. the fan does does not start. Working throught the troubleshooting chart in the manual, I got to the point where pin 1 of the ignition control connector was not showing 10vdc. On the strength of this, I have replaced the thermistor and Aquastat PCB but am now no further forward. The connector still shows only 2vdc when the connector is disconnected and 0vdc when connected.
I am now confused. Either the replacement PCB is also faulty or the problem actually lies in the ignition assembly PCB, the only other likely, major (and expensive) component left. I might also mention that the ignition lockout light started coming on regularly during the summer but seemed to settle down again in the colder weather. Does anyone have experience with this type of boiler please.