radio10 wrote in message
...
My thanks to all for helpful comments.

Updates:

1)Triac Gate disconnected as suggested by Jamie and No heat, so confirms
Triac OK.

2)No S/C between heating element and earth/common. Now looking upstream
from Triac.

3)I have checked the temp sensor in Iron (wand) and it's O/C ALL of the
time. So, have substituted a low value Pot and can now create a variation in
readout on Station display now, but still the element is ON all the time
(red hot tip etc!)


Richard


Have you tried forcing a change of the inputs to the op-amp?
Any idea what the 8pinner is? presumably not an EEprom as nothing to store