Patent ID: 9518763
Filing Date: 2016-12-13
CPC Classification: F24F,F24H

Claim Text:
1. A method performed by a controller of a climate control system having an igniter and an igniter relay, the method comprising: in one or more of a plurality of heating operational phases of the system, sensing current draw by the igniter and sensing voltage between terminals of a second relay of the system, where the current draw is sensed by a current sensing circuit connected across the igniter, the current draw sensing being performed independently of the igniter relay; for a given one of the heating operational phases in which the sensing is performed, comparing the sensed current and voltage with a current value and voltage value predetermined together for the igniter and second relay in relation to the given operational phase to indicate the presence of a condition specifically of the igniter, of the second relay, or of the igniter relay, the comparing performed using a processor; and based on the comparing, distinguishing between a failure of one of the relays and a failure of the igniter.