Patent ID: 9618233
Date: 2017-04-11
CPC Classifications: F24H

Claim:
1. A method for determining whether a water heater appliance is operating with a timer switch, comprising: measuring a temperature of water within a tank of the water heater appliance at a start of a current power interruption; measuring the temperature of water within the tank of the water heater appliance after the current power interruption; classifying the current power interruption as a short power outage or a long power outage based at least in part on a difference between the temperature of water within the tank of the water heater appliance at the start of the current power interruption and the temperature of water within the tank of the water heater appliance at the end of the current power interruption; determining a power on time interval between a previous power interruption and the current power interruption if the current power interruption is the long power outage at said step of classifying; and establishing that the water heater appliance is not operating with the timer switch if the power on time interval is greater than a threshold time interval.