DENVER (CBS4)- Firefighters rushed to The Potter’s House of Denver Wednesday afternoon. There was a lot of smoke billowing from the church roof.

Fire investigators from Cunningham Fire said the fire was caused by a malfunctioning air conditioning/heating unit on the roof.

The Potter’s House of Denver is located at 9495 Florida Ave. in Denver.

The damage was limited to the roof and a ballroom below has minor water damage.

The church sanctuary and most of the church was not damaged.

Firefighters were able to reach the church quickly because there is a nearby fire station. That’s where firefighters were undergoing a major training exercise on Wednesday.

When they received the call, a large amount of firefighters was available to rush to the church to put out the fire. The first unit arrived in just 3½ minutes.

Gusting winds could have made the situation much worse in just a short amount of time.