Technician cleaned the unit as I understand. Lit the pilot, checked operation for normal, and left. Tenant returned after work, house was a bit cool, tried thermostat with no response, checked and pilot was out again. Not sure where to go from here.

Unit is a 1978 Coleman Furnace that has worked fine since the unit was new. This year, the pilot was lit by my tenant (I understand we probably should have left it burning) and the furnace worked for about 10 days at which time it stopped working (the pilot went out). A technician was called. He lit...