This may help.
http://www.ultimatehandyman.co.uk/forum1/viewtopic.php?t=23457
The ignition lead provides a high voltage / high current path for the sparking. It also provides a low voltage / low current path for the flame sensing, which needs to sense a flame before allowing the main burner to start. See where this is going? If the sparking and the main PCb are OK, then have a look at the ignition lead and all its connections and check for continutity.
Also check the electrode is correctly in the flame as per the manual (download or contact Glowworm if necessary)
ladskcnaslc
October 2020
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