Would much appreciate anyone telling me how to egt the heater to work on electric only. The instruction book which came with the caravan does not explain clearly (for me!) I've had it working but last week when we went I couldn't get it to waork. Unfortunately there is not a light to show that the heater is on for electric - only gas or 12v. I changed the fuse in the separate heater switch which is placed next to the gas and 12v control plate but no difference. Would like to use this for Easter if poss. Thank you.