Fault codes covered
45-14, 45-15, 45-16
All code 45 events are indications that the thermostat has received a request for power curtailment from the utility. Code 45-14 is a General Power Curtailment Event that results in approximately a 30% reduction in capacity available to the system. Code 45-15 is a Critical Power Curtailment Event that results in approximately a 50% reduction in capacity available to the system. Code 45-16 is an Off Mode Power Curtailment Event that results in the system remaining off.
Source: ACHPVSR454-02SM troubleshooting pages.