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HEAT SEQUENCER

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In-Store Pickup Only — Browse our catalog below, then visit us in Dallas or call (214) 340-9421 to purchase.

All parts 1,291 Equipment & Systems 67 Filters & Air Quality 83 Air Distribution 259 Furnace & Heating 39 Refrigeration 67 Thermostats & Zone Controls 17 Switches & Sensors 132 Electrical Components 224 Motors & Blower Parts 129 Tools & Supplies 276

Showing all 15 results

Low Stock
HEAT SEQUENCER
42-23116-07 – HEAT SEQUENCER (TPST)
SKU · 42-23116-07
$37.16
24V TPST heat sequencer. OEM Rheem/Ruud part for electric furnaces. Triple-pole single-throw for staging three circuits on timed delay.
In Stock
HEAT SEQUENCER
HS3P1S – HEAT SEQUENCER (HS24A345, DPST-SPST)
SKU · Q105
$41.81
24V heat sequencer with 1 DPST and 1 SPST relay in series. Handles up to 25 amps. Replaces Nordyne 621678 and HS24A345. Common electric furnace part.
Low Stock
HEAT SEQUENCER
42-23116-09 – HEAT SEQUENCER (TPST)
SKU · 42-23116-09
$40.27
24V TPST heat sequencer. OEM Rheem/Ruud part for electric furnaces. Triple-pole single-throw for staging three circuits. Different timing than 42-23116-07.
In Stock
HEAT SEQUENCER
HS2P1S – HEAT SEQUENCER (DPDT, Q103)
SKU · Q103
$29.45
24V DPDT heat sequencer (2 switches). Supco Q103. Controls a heating element and a blower motor on timed delays. Replaces 24A34-3.
In Stock
HEAT SEQUENCER
HS4P1S – HEAT SEQUENCER (HS24A346, 2 DPDT)
SKU · Q106
$42.40
24V heat sequencer with two DPDT relays in series. Handles up to 25 amps. Replaces HS24A346. For electric furnaces with multi-stage heating elements.
In Stock
HEAT SEQUENCER
HS1P1S – HEAT SEQUENCER (SPST, Q101)
SKU · NS101
$27.35
24V SPST heat sequencer (1 switch). Supco Q101. Basic single-stage sequencer for electric furnaces. Controls one heating element or blower.
Low Stock
HEAT SEQUENCER
HK61EA033 – RECTIFIER BOARD (1186788)
SKU · 1186788
$52.72
Carrier/Bryant/Payne rectifier board. Converts AC to DC for relay control in electric heat systems. OEM part HK61EA033, replaces older HK61EA003.
In Stock
HEAT SEQUENCER
HN61PC003 – RELAY (CARRIER, DC, 1172506)
SKU · 1172506
$43.82
24V DPST relay with 30-amp capacity. OEM Carrier/Bryant/Payne part HN61PC003. Replaces older HN61PC002 and cross-reference T92S7D22-24.
Low Stock
HEAT SEQUENCER
88K09 – HEAT SEQUENCER (TRIPLE STACKED)
SKU · 88K09
$74.93
24V triple-stacked heat sequencer for Lennox electric furnaces. Thermal time delay relay that stages heating elements and fan activation.
In Stock
HEAT SEQUENCER
HS2P2S – HEAT SEQUENCER (DPDT, Q104)
SKU · Q104
$29.45
24V DPDT heat sequencer (2 switches). Supco Q104. Different delay timing than Q103. Replaces HS24A344, Emerson E143, and NS104.
In Stock
HEAT SEQUENCER
HS1P2S – HEAT SEQUENCER (SPST, Q102)
SKU · NS102
$28.40
24V SPST heat sequencer (1 switch). Supco Q102. Longer delay timing than Q101. Controls one heating element or blower in electric furnaces.
Low Stock
HEAT SEQUENCER
42-23116-08 – HEAT SEQUENCER (DPST)
SKU · 42-23116-08
$31.02
24V DPST heat sequencer. OEM Rheem/Ruud part for electric furnaces. Double-pole single-throw configuration. Different timing than 42-23116-06.
In Stock
HEAT SEQUENCER
42-23116-01 – HEAT SEQUENCER (SPST)
SKU · 42-23116-01
$38.26
24V SPST heat sequencer. OEM Rheem/Ruud part for electric furnaces. Single-pole single-throw configuration for staging one heating element.
In Stock
HEAT SEQUENCER
PR1922 – RELAY (DC)
SKU · PR1922
$29.33
22V DC SPST relay for electric heaters in ICP/Heil/Tempstar units. Rated 30A at 28V DC and 40A at 277V AC. Direct replacement for ICP furnaces.
Low Stock
HEAT SEQUENCER
42-23116-06 – HEAT SEQUENCER (DPST)
SKU · 42-23116-06
$36.92
24V DPST heat sequencer. OEM Rheem/Ruud part for electric furnaces. Double-pole single-throw for controlling two circuits simultaneously.

Signs You May Need a New Heat Sequencer

Heat sequencers are used in electric furnaces and heat pump air handlers to stage heating elements on in sequence rather than all at once, preventing a massive electrical surge.

🌡Some Heating Elements Work but Others Don't▼

The system heats but not to the set temperature — some stages aren't engaging.
You can visually inspect the elements through the access panel — only some glow orange.
A failed sequencer won't energize its associated heating element.

⚡All Heat Strips Come On at Once▼

A stuck-closed sequencer sends power to all elements simultaneously.
This draws a massive amount of current and can trip the breaker.
You may notice lights dimming throughout the house when the heat turns on.

❌No Heat at All from Electric Furnace▼

The blower runs but the air isn't warm.
If all sequencers have failed open, no heating elements receive power.
Check for a blown fuse on the circuit board as well.

Not sure which part you need? Bring your old part to our Dallas store — our team will test it for free and help you find the right replacement.
📞 (214) 340-9421Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm

Call (214) 340-9421