Disaster... me again!
Unfortunately it hasn't worked
I installed the new PCB and the first thing I noticed was that when I switched it on, there were two clicks from the relays - on the old PCB there was only one click (from the right-side relay) when switching on.
But the boiler still didn't burst into life with the new PCB, so I removed the fan Molex, and as I pulled at it, it made a vital connection and the fan and burners started to work. Thinking this bad connection was the problem I switched it off and sorted out that molex so the connection was good.
On switching on again, no joy, and this time only ONE relay clicked.
On closer inspection, the left relay is charred. I don't know if it was charred already (it's a used PCB). On looking at the old board, the relay is also charred on that one.
http://www.hpjw.co.uk/temp/charring.htm
So:
1) Is this charring normal?
If not
2) What does this relay do?
...and therefore
3) What could be causing the relay to burn out?
Help!
Steve
Unfortunately it hasn't worked
I installed the new PCB and the first thing I noticed was that when I switched it on, there were two clicks from the relays - on the old PCB there was only one click (from the right-side relay) when switching on.
But the boiler still didn't burst into life with the new PCB, so I removed the fan Molex, and as I pulled at it, it made a vital connection and the fan and burners started to work. Thinking this bad connection was the problem I switched it off and sorted out that molex so the connection was good.
On switching on again, no joy, and this time only ONE relay clicked.
On closer inspection, the left relay is charred. I don't know if it was charred already (it's a used PCB). On looking at the old board, the relay is also charred on that one.
http://www.hpjw.co.uk/temp/charring.htm
So:
1) Is this charring normal?
If not
2) What does this relay do?
...and therefore
3) What could be causing the relay to burn out?
Help!
Steve