Plumbing Questions? Ask a Plumbing Expert.
Please attach a well focused, close up photo of the wiring diagram glued inside the service panel,you can use the paper clip icon at the right end of the toolbar at the top of this dialog box,
If there is no paper clip icon, look for the '+attach files' link at left of your send button.
Tell me a lot about your technical skills as well please so that I can approach the trouble shooting most effectively at your skill level.
I need to know what type of radiators you have, often air in the radiators will prevent water flow, that will not allow the flow switch to close, and many boilers are wired so they will not run unless there is water flow.
If I miss you tonight I will pick up your response first thing in the morning.
Its good that you had a technician come out, you would have needed him regardless and he can make sure that the boiler is safe while he is at it.