We bought our Viking 17FQ in June and had to take it in to have the furnace worked on in November, they said they had to clean the contacts, When we left it worked but not for long and since we live inn Southern Arizona we didn't winterize our RV , so when it goes to the lower 30's we turn the furnace on low, Well it worked one or two times now won't come on. The fan comes on and runs cold for about 30 seconds then shuts off. can't here igniters kick on. Hot water tank, stove and fridge all work. Should I take it back to service or is it something I can handle myself.