Recent content by russell.townsend

Wow, Really thanks for all the help. Really useful. I've found the problem: First I did as suggested and used my blowlamp on the electrodes - and the ignition still failed. I assumed that it was the PCB failing, so I started off with my old PCB and used an oscilloscope to find that C28 was...

Thanks again, I understand what you mean about a 10M resistor shouldn't work, but it seems to defeat the circuit. I'm going to thoroughly check and test the polarity - you're right - that would be embarrasing. I didn't know what a "gas valve offset" was, bit it seems to be the...

Hello thanks for the replies. Not sure how to measure the gas valve offset on this valve. But there is no trouble igniting / no improper noise, so I don't suspect this. Heat exchanger is clean and dry. I still suspect that the new PCB is faulty. I'm going to borrow an oscilloscope to...

Yes, both PCBs and the new wiring / electrodes all came in a kit. I didn't find anything suspicious in the burner.

Thanks for the replies. Input pressure: 26mbar off -> 22mbar on doesn't stay on for long enough to check full on pressure. I looked carefully at the PCB and realise that the "chip" U5 is a LM393N and this is connected, via resistors to the flame sense electrode. By putting a meter...

Forgot to say: Thanks for the replies. Really appreciated that you can take time to reply to me !

Checked electrode continuity: both are 0.2 ohms from electrode tip to back of PCB. checked resistor values on PCB (they are the same as on old PCB) Performed a visual check of PCB and no obvious cracks / dry joints etc.. checked resistance between electrodes >10 Mohm Fan speeds: With...

Suprima 120: Started cutting out: Ignited, but spark generation continued, then shut down (after 2-3 secs). Assumed that PCB was faulty, so I have put in a new one. (I put in a complete ignition kit, inc. electrodes and adjusted fan speeds) Problem continues - exactly the same...