Site manager Lynne Kohle says when the higher levels of the gas were noticed last Sunday staff immediately went into action.
Paramedics were called, along with the volunteer fire department and SaskEnergy.
Three staff and a resident reported they weren't feeling well, but no one needed to be sent to hospital.
The levels are back down to zero, but no specific cause was found so inspections are being scheduled for the fuel-burning appliances.
A carbon monoxide leak in 2010 at a care home in Humboldt contributed to the deaths of three long-term care residents. (CJWW)