Service Call: Frigidaire Dual-Zone Cooktop Issue in Davie
A homeowner in Davie reached out to iFixExpress when their Frigidaire smooth-top electric stove developed an annoying symptom: the primary dual-zone front burner ceased working in its center section. When set to the inner zone, the burner stayed completely cold. When switched to activate both rings, only the outer perimeter warmed up. Dual elements are essential for versatile cooking, making this malfunction an immediate daily inconvenience.
Diagnostic Strategy: Isolating the Circuit
When an electric radiant element fails to heat, the fault almost always lies in one of two components: the radiant heating coil itself or the infinite switch controlling voltage distribution to that zone. Rather than guessing and replacing expensive assemblies blindly, we followed a methodical testing sequence.
Power Isolation & Disassembly
Cut high-voltage power at the 240V dual-pole breaker. Lifted the main cooktop assembly and removed rear console shielding to safely access the wiring harness and element terminals.
Element Resistance Testing
Disconnected the wiring leads to the dual radiant element underneath the ceramic glass. Using a digital multimeter set to ohms (resistance), we measured across the inner ribbon element terminals. The inner coil read within manufacturer spec (approx. 38 ohms), confirming the heating ribbon was structurally sound with no open circuit.
Control Switch Inspection
Moved upstream to the dual-burner infinite control switch mounted behind the front control panel. Visual inspection revealed localized heat discoloration on terminal L2/H1. Continuity checks confirmed that the internal mechanical contact responsible for energizing the center element had completely burned open.
The Root Cause: Failed Dual Infinite Switch
Dual-zone radiant burners require a specialized dual infinite switch with stacked internal contact points. Over years of thermal cycling and continuous current draw, these internal contact points can arc and develop carbon buildup or burn out entirely. Because the outer ring contacts remained intact, only the inner element circuit was interrupted.
Next Steps and Completion
The diagnostic was completed in just 20 minutes. We verified the exact Frigidaire OEM part number for the dual infinite switch and placed the order immediately through our local distribution hub. With the appliance safely secured and reassembled, we scheduled a return visit in two days to drop in the new switch and return the cooktop to 100% operation.