58804B Speed Queen Dryer Secondary Coil is an electrical coil assembly used in certain Speed Queen dryer models; it is indeed a wound conductor that serves as part of the appliance’s electromechanical control hardware rather than a heating element. As a secondary coil it typically functions as a winding within a transformer or as the driven coil in a solenoid/actuator assembly, and its physical form and terminal configuration are resolute by the specific control module or relay assembly in wich it is indeed installed.
Within the appliance the secondary coil interfaces directly with the control board,primary winding or driver circuitry,and the load circuits that it helps switch or sense.Depending on the design, the coil provides magnetic coupling to produce an output voltage, or it generates the magnetic force required to actuate relays, latches or contactors that control motor circuits, heating circuits, or safety interlocks. Proper operation of the coil is therefore important to timing, switching reliability and safe operation, and it works in concert with fuses, thermostats, contactors and motor control circuitry.
In this article readers will find a technical review of the coil’s intended function, guidance on model compatibility and part identification, common failure symptoms (for example open windings, short circuits, intermittent actuation, or insulation breakdown), and systematic troubleshooting steps such as resistance and continuity checks, voltage measurements under load, and visual inspection criteria. The article will also cover practical replacement considerations including matching electrical specifications, mechanical fit, connector types, and safety precautions to observe when removing and installing the 58804B secondary coil.
Table of Contents
- Function and Role of the Secondary Coil within the Dryer’s Control and Heating Circuits
- How the 58804B Speed Queen Dryer Secondary Coil Works Inside the Appliance: Electrical Operation and Signal Path
- Common Failure Symptoms and Diagnostic Readings for a Faulty secondary Coil
- Compatibility,Replacement Considerations and Step‑by‑Step Installation and Troubleshooting Procedures
- Q&A
- Final Thoughts
Function and Role of the Secondary Coil within the dryer’s Control and Heating Circuits
The 58804B Speed Queen Dryer Secondary Coil is the electromagnetic winding that provides the control-side output used to operate heating and switching devices within the dryer’s control assembly. In many dryer designs this secondary winding either supplies the low-voltage control circuit or forms the actuating part of a contactor/relay that isolates the high-current heater circuit from the user/control electronics. When energized the coil generates a magnetic field that moves an armature or provides the stepped voltage needed to close power contacts; when the coil is de-energized the field collapses and the power contacts open, interrupting current to the heating element or gas valve.
Functionally and for compatibility, the coil must match the original part’s rated voltage, impedance, terminal configuration and insulation class to maintain reliable operation and safe separation between control and line voltages. Technicians verify an installed secondary coil by measuring continuity and coil resistance, checking secondary voltage under load, and visually inspecting for heat- or moisture-related damage. A replacement like the 58804B should be checked for the same mounting footprint and connector type to avoid stress on wiring or circuit board traces; incorrect voltage or a shorted/grounded winding will manifest as no heat, intermittent operation, or blown fuses/ tripped breakers during attempts to energize the heater.
- Common symptoms of a failing secondary coil: loss of heating, intermittent heating cycles, humming relay sounds, or control circuit voltage drop under load.
- Basic diagnostic steps: measure coil resistance for open/short, confirm expected secondary voltage with a voltmeter while circuit is actuated, and inspect for discoloration or insulation breakdown.
| Item | Description |
|---|---|
| Function | Provides control-side voltage or magnetic actuation to switch the dryer’s heating circuit while isolating line power from control electronics. |
| Typical tests | Continuity/resistance measurement, secondary voltage measurement under load, visual inspection for overheating. |
| Compatibility | Match rated voltage,coil resistance/impedance,terminal type,and mounting to the original part to ensure safe and reliable replacement. |
How the 58804B Speed Queen Dryer Secondary Coil works Inside the Appliance: Electrical Operation and Signal Path
The 58804B Speed Queen Dryer Secondary Coil is the wound conductor that provides the controlled low-voltage output used by the dryer’s control/actuation circuitry. Electrically, the coil operates as the secondary winding of a small transformer or as the secondary winding inside a relay assembly: when the primary winding is driven by the dryer control board or mains-derived control voltage, magnetic flux links into the secondary and induces a proportional voltage or current. That induced signal is routed to the control electronics or to a switching device (for example a contactor or solenoid driver) and is designed to provide galvanic separation and a specific turns ratio so the control board sees the correct voltage and impedance for reliable switching and sensing functions.
In operation the secondary coil should present the designed resistance and isolation characteristics; typical diagnostic checks include a DC resistance measurement for winding continuity and an insulation check for leakage to chassis.Compatibility when replacing the coil requires matching the turns ratio, impedance, physical mounting, and terminal arrangement so the induced voltage and phase relationships remain correct for the dryer’s control logic. Practical symptoms of a degraded secondary coil include failure of heating or motor control circuits to energize, intermittent relay chatter, or anomalous control-board voltage readings; technicians commonly confirm faults by measuring continuity, applying a known excitation to the primary and observing the resulting secondary voltage, and comparing those results to the expected values for a compatible replacement.
- Common symptoms: no heater/motor actuation, intermittent cycles, diagnostic error codes related to control voltages.
- Speedy tests: continuity (ohms) on the secondary,insulation/leakage test to chassis,applied excitation test to verify induced output.
- Replacement considerations: match turns ratio, impedance, mounting, and terminal layout for proper compatibility.
| Item | Description |
|---|---|
| Function | Provides induced low-voltage output or isolation for control/actuation circuits. |
| Typical failure effect | Loss of control voltage leading to non‑functioning heater/motor or erratic switching. |
common Failure Symptoms and diagnostic Readings for a Faulty Secondary Coil
The 58804B Speed Queen Dryer Secondary Coil is the wound conductor that provides the induced voltage or actuation force used by downstream control circuits or solenoid-driven mechanisms in the dryer. In practice, a failing secondary coil will produce symptoms such as loss of actuation, intermittent operation, excessive heating of the drive or valve assembly, or diagnostic error codes on newer models; mechanical parts dependent on the coil will either not move or will chatter. Compatibility-wise,the coil is a component-specific part fitted to particular Speed Queen control modules or actuators,so symptoms that mimic motor or control board faults frequently enough trace back to the coil when continuity or insulation has failed rather than electronic control logic.
- No tumble or no heating while the motor or other systems have power
- Humming or buzzing from the control/actuator area and intermittent operation
- Burnt odor, discoloration, or visible damage at the coil windings or terminals
- Multimeter shows open circuit across coil terminals or continuity to chassis ground
| Item | Description |
|---|---|
| Continuity (Ω) | Measure DC resistance across the coil: functional coils show measurable resistance (ranges vary by coil type – see below); an open (OL) indicates a broken winding. |
| Insulation to chassis | Test for no continuity between coil terminal and chassis. Any measurable continuity indicates a short to ground and requires replacement. |
| under-load voltage | Measure AC or DC output (as applicable) when the circuit is energized. significant voltage drop under load suggests high winding resistance or internal fault. |
| Visual/thermal | Inspect for discoloration, melted insulation, or hotspots during operation; overheating correlates with high resistance or partial shorting internally. |
For field diagnostics, use a digital multimeter to check DC resistance and a clamp meter or voltmeter to verify operating voltage under load. As a practical example, many dryer power coils intended to carry motor or solenoid current will measure from under 1 Ω up to a few tens of ohms, while control/relay-type secondary coils can be in the tens to hundreds of ohms; consult the machine service manual for model-specific nominal values. Replace the 58804B if you read an open circuit, measurable continuity to chassis, or a resistance value that deviates significantly from the documented nominal – these readings indicate broken windings, insulation failure, or internal shorts that cannot be repaired reliably in the field.
Compatibility, Replacement Considerations and Step‑by‑Step Installation and Troubleshooting Procedures
The 58804B Speed Queen Dryer Secondary Coil is an electromagnetic winding used as the control winding in the dryer’s relay/transformer/contactor assembly; it produces the magnetic field that actuates relays or solenoids to switch the motor and heating circuits. In normal operation the secondary coil must present the correct impedance, insulation integrity, and stable mechanical mounting so that the relay armature closes cleanly and repeats over many cycles. Compatibility depends on electrical rating (coil voltage and current capability), connector style, and mounting footprint-replace only with a coil that matches the dryer model’s electrical and mechanical specifications or a verified cross-reference to avoid improper actuation, overheating, or misalignment that can cause intermittent starts or failed heating cycles.
When replacing or troubleshooting a coil,first isolate the appliance and verify the service manual part number against the old coil; then perform electrical checks (continuity and insulation/resistance tests) and a visual inspection for burned insulation,deformed bobbin,or loose terminals. Common service steps include documenting wiring, measuring coil resistance to detect opens or shorts, and confirming that the relay armature is free-moving and properly aligned after installation. Symptoms indicating coil failure include no motor start, heater relay not energizing, humming without contact closure, or thermal odor; if these persist after a correct coil replacement, inspect the associated control board, driver transistor/relay driver, and supply voltage for upstream faults.
- Disconnect power and tag wires before removal.
- Record wire locations and take photos of the original installation.
- Measure continuity across the coil and check for insulation leakage to chassis.
- Fit replacement coil with identical connectors and secure mounting to prevent vibration-induced misalignment.
- restore power and verify actuation under normal load conditions; monitor for overheating or intermittent behavior.
| Item | Description |
|---|---|
| Function | Provides the magnetic field to actuate relays/solenoids controlling motor/heater circuits. |
| Typical failure modes | Open winding, shorted turns, degraded insulation, terminal corrosion or mechanical deformation. |
| Diagnostic test | Continuity/resistance measurement, insulation-to-chassis check, and functional relay actuation under supply voltage. |
| Compatibility checks | Match coil voltage, connector type, mounting footprint, and service part number or approved cross-reference. |
Q&A
What is the 58804B Speed Queen dryer secondary coil and what does it do?
The 58804B secondary coil is a solenoid coil used with the dryer’s gas valve assembly. In a multi-coil gas valve the secondary (or “holding”) coil provides the sustained magnetic field after the valve is pulled open, allowing gas to flow while the burner is running.It works together with the primary/inrush coil to open and hold the valve.
What symptoms indicate the secondary coil has failed?
Common symptoms include the dryer not producing heat (no burner ignition) even though the drum tumbles, intermittent lighting of the burner, or the burner shutting off after a short time. You may also hear clicking without ignition. As several components can cause similar symptoms (igniter, gas valve, flame sensor, control board), the coil should be diagnosed as part of a systematic test.
How can I test the secondary coil safely?
Always disconnect power and shut off the gas supply before testing. Use a multimeter set to continuity/ohms to check for continuity across the coil terminals; an open circuit usually means a failed coil. Compare measured resistance to the manufacturer’s specification if available. Do not apply line voltage directly to the coil for bench testing unless you know the coil’s rated voltage and have proper procedures and equipment-this is best left to qualified technicians.
Can I replace only the secondary coil, or do I need to replace the entire gas valve?
In many cases the replacement secondary coil (part number 58804B) can be installed separately if the valve body and primary coil are in good condition. However,if the valve body is damaged,corroded,or the primary coil is also failing,replacement of the entire gas valve assembly is recommended. Always verify compatibility and follow Speed Queen’s service documentation.
How do I install the replacement coil, and what safety steps should I take?
Turn off electrical power to the dryer and shut off the gas at the supply valve. Relieve any residual gas per the service manual, then remove the dryer access panel to reach the gas valve. Note wiring locations (take a photo), disconnect the coil wiring and remove the old coil, then install the new coil and reattach wiring. Before restoring normal use, check all gas connections for leaks with a soap solution or approved leak detector, and only restore power and gas if there are no leaks.If you are not comfortable working on gas appliances, hire a qualified technician.
How do I confirm 58804B is the correct part for my Speed Queen dryer?
Check the dryer’s model and serial number and consult the Speed Queen parts diagram or parts list for that exact model. You can also contact Speed Queen customer support or an authorized parts dealer and provide the machine model/serial number to confirm that 58804B is the correct secondary coil for your unit.
What are typical resistance values or electrical specs for the secondary coil?
Exact resistance and voltage ratings vary by valve design and manufacturer. A functioning coil will show measurable low-to-moderate resistance (not open circuit) on an ohmmeter. For the precise ohm value and rated operating voltage, refer to Speed queen’s technical data for the specific gas valve or the replacement coil packaging. If you cannot find the spec,compare the measured resistance to a known-good coil or contact Speed Queen support.
Is there anything I should consider about OEM vs aftermarket coils and cost/availability?
OEM coils (Speed Queen/approved) are designed to meet the dryer’s specifications and are generally recommended for reliability and warranty reasons. Aftermarket coils may be less expensive but verify compatibility, ratings, and quality. availability varies; some parts are stocked by appliance parts distributors and authorized Speed Queen dealers. If in doubt, request an OEM part number or consult a technician to ensure correct selection.
Final Thoughts
The 58804B Speed Queen Dryer secondary coil serves a specific electromagnetic function within the dryer’s control system,and while it is a small component,it plays a measurable role in the unit’s reliable operation. When functioning correctly the coil supports proper control of cycling and electrical switching, contributing to consistent drying performance, appliance longevity and overall safety.
Because symptoms of coil failure can resemble other electrical or mechanical issues, accurate diagnosis is essential. Testing with appropriate diagnostic tools and following the manufacturer’s service facts helps distinguish coil faults from unrelated problems. When replacement is necesary, using the correct 58804B part or an approved equivalent and observing recommended installation and safety procedures preserves performance and any applicable warranty.
attention to the condition of the 58804B secondary coil-combined with careful diagnosis and professional replacement when required-helps maintain dryer efficiency, reduces the risk of secondary damage, and supports continued safe operation of the Speed Queen appliance.
Professional Appliance Service
If your appliance requires professional diagnosis or repair, visit
Revolff Home Services
for expert appliance repair services.
For local appliance service information see
Dryer repair Henderson
.
Replacement parts for many appliance models can also be found at
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