problem with a halstead best 40

[best boy]

I've just registered and need a little help with my best 40.
It won't start.the book says look for 1vdc or 10vdc at terminal 1 on the ignition controler. I have 1vdc but when it tries to start i get a reading of 10 volts, then it goes back to 1 vdc. I don't know whether to replace the aquastat pcb or the ignition device.
Any suggestions?

 

[gas4you]

The few of these that I have been to have all had the ignition pcb faulty.

Are the MI's not more specific in their fault finding?

 

[gasglider]

Fitted Ignition PCB to one of these recently, - exactly same symptoms as described. Strange thing was, when I started the boiler it ran for 5 secs, then cut out, with the re-set light on the (new) ign pcb box coming on. It would not then re-set, no matter what I did. - As it was late on, I called back in the morning, and tried again - It re-set immediately, and works perfectly now. Strange.

If it helps, the one described here, would not run the fan either, until the Ign PCB was changed.

 

[ChrisR]

You do have to turn the boiler stat knob full up before they'll reset.

 

[best boy]

Thanks for your replys. I have had to wait for the suppliers to open before I can get any parts. So tommorrow I will order an ignition device. I'll let you know when i've fitted it