Carrier HN67QC006 Sequencer

The Carrier HN67QC006 Sequencer is a critical OEM replacement part designed for staggering the activation of electric heating elements in residential and commercial furnaces. By utilizing a 24V control circuit to actuate terminal switches, this two-stage sequencer prevents massive inrush current and potential circuit breaker trips. It manages the resistive load by ensuring heating coils and the blower motor are staged logically, typically featuring an "on" timing of 1 to 30 seconds and an "off" delay of 30 to 90 seconds. This OEM component replaces P284-1313 and 15SH2, ensuring full compatibility with Carrier, Bryant, and Payne air handlers and fan coils. Constructed with a durable bimetal disc mechanism, the HN67QC006 maintains system stability during high-demand heating cycles. For HVAC technicians, this sequencer is a trunk-stock essential for resolving short cycling or "no heat" calls caused by welded or open contacts in the heating stack.

• Direct OEM Compatibility: Engineered specifically for Carrier-family equipment, ensuring correct terminal spacing and mounting alignment for 50/60 Hz systems.
• Electrical Load Management: Features a two-switch configuration that staggers power demand, protecting the transformer and preventing voltage drops during startup.
• Optimized Airflow Sequencing: Designed to bring the blower fan on in coordination with the first heating stage to prevent limit switch tripping.
• Durable Bimetal Construction: Built to withstand the constant thermal flexing required for resistive heating load control.

How do I troubleshoot a suspected bad sequencer?
Confirm 24V at the heater (M1/M2) terminals. If the heater is energized for over 90 seconds but the high-voltage contacts do not show continuity, the bimetal disc or internal heater has failed. Conversely, if the fan runs continuously with no 24V call, the contacts may be welded shut.

Can I use this to replace a single-stage sequencer?
While this is a 2-stage sequencer, it can often be used in place of single-stage units if the wiring schematic allows for the additional timing delays, though it is always recommended to match the original stage count for exact performance.

What does it mean if my furnace is "short cycling" with this part?
If the sequencer initiates the heat but the system shuts down quickly, check for restricted airflow or a dirty filter. The sequencer is likely functioning, but a high-limit switch is interrupting the circuit due to excessive heat buildup.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.