I have just tried my heating for the first time since last winter and the pilot light hasn't lit. The fan (I think..) came on at first but has since gone silent. There doesn't seem to be an ignition switch nor an easy way to remove the lower (brown) cover. The cover does have rust on it but is bending rather than sliding off. Is the switch inside there, shall I persevere with cover? I'm renting the property but would like to fix the problem myself, if I can. Please help!