I have Ifinity system that will not go to high speed fan when calling for high

The system is a Carrier Infinity system with a heat pump. The stat shows the system is on high cooling but the fan speed is only going up to medium speed at best.
Any ideas on what could cause this problem?
Reply to

Site Timeline Threads

HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.