Who Pays for HVAC Service Call?

[Shawn Dandridge]

My tenant contacted me late last night saying the heat wasn't blowing upstairs but it was downstairs. As this used to be my primary residence I immediately knew it was the dampers. I asked the tenant if they checked the dampers and she assured me her husband had checked it multiple times and the hot air still wouldn't blow upstairs. Long story short, HVAC guy came out and opened the upstairs damper. $175 for diagnostic and actually opening the damper... I looked over my lease and it doesn't address service calls at all. How do I approach this. I would assume this is general tenant maintenance.