Horstmann HRT3 wired incorrectly

Before seeing this I had repeated the sequence again and this time at step 7 the boiler did fire up, took about 2 minutes to do so.
Should only take a few seconds for the valve to open. Definitely seems to be sticking.

If it is sticking, try using some silicon lubricant. WF40 is not recommended as it can rot the seals round the spindle.
 
Before seeing this I had repeated the sequence again and this time at step 7 the boiler did fire up, took about 2 minutes to do so.
Should only take a few seconds for the valve to open. Definitely seems to be sticking.

If it is sticking, try using some silicon lubricant. WF40 is not recommended as it can rot the seals round the spindle.

Thank you for all your advice it is much appreciated. I will do what you recommended earlier as well.
 
If it is sticking, try using some silicon lubricant. WF40 is not recommended as it can rot the seals round the spindle.

I have got some silicon lubricant. Where should I apply the lubricant to? Do I need to remove the valve cover and lubricate anything inside?
 

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