No ignition I have an imperial icv-1. The three way on/off/on switch blew and I replaced it. The switch now works, but when I turn oven on, only the fan works. There is no ignition. What can I do

No. It should be automatic ignition if it is UK spec'.

Are you in the EU or US and can you be more specific, it is fairly straight forward. If in doubt get a professional to connect it for you.

Not sure what type of oven you are having, Gas or Electric ?

burner wont stay light

Check your flame switch. If it is open their will be no heat. Number 17

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Not sure if you have electronic or mechanical thermostat. However problem is likely to be in the electronic ignition sequence box (Usually a Fenwall) Also check the panel cooling fan is working, it cools the Fenwall box.

yes

post this link
http://www.retrevo.com/s/Imperial-ICV-2-Ovens-review-manual/id/6546bh649/t/1-2/
they may be able to help you

If you could narrow down the buzzing noise, where and when, it may be significant.

As far as the unit losing its flame, I believe this unit uses a "flame switch" to prove there is a pilot flame. (Part# 1133) So first visually verify the flame quality and the position of the bulb for the flame switch. And assuming that's fine, you need to check the electrical switch portion of the part. It is in the control cabinet towards the bottom. Just two wires.

Usually this problem is a switch failure, rather than a lose connection, or a poor pilot flame. Good luck

this is a common indication that the ignition module is probably going bad or the flame sensor is not sensing the flame on the burners. There are other, more technical issues possible but this is usually the most common. The "not restart" , if referring to the burners, is an indication that the ignition module has "locked out" the system, usually after 3 failures of attempts to light the burners.