297237702 Frigidaire Refrigerator start Relay is a dedicated compressor start relay used on Frigidaire refrigeration appliances; it is a small electromechanical or solid‑state control device that provides a temporary high starting torque to the refrigerator’s single‑phase compressor motor by energizing the start circuitry during motor startup. As a component,it is typically mounted at or near the compressor terminal cover or inside the appliance electrical compartment and is identified by the OEM part number for direct replacement on compatible models.
Inside the appliance the start relay interfaces directly with the compressor’s start and run windings (and with a start capacitor where applicable)and it works in concert with the compressor overload protector, the temperature control or electronic control boardand the incoming mains supply.When mains voltage is supplied and the compressor receives a start signal, the relay temporarily connects additional current to the start winding (or presents a low impedance path) to achieve initial torque, then drops out to leave only the run winding energized; correct timing and electrical characteristics of the relay are therefore critical to controlling inrush current, preventing overheating of the start winding, and ensuring reliable motor starting over repeated cycles.
In this article readers will find a technical description of the relay’s function and variants (PTC thermistor versus relay types), guidance on model compatibility and how to verify the correct replacement part, typical failure symptoms (for example repeated clicking, compressor humming without starting, tripped breakersor loss of cooling)and structured troubleshooting steps and diagnostic checks appropriate for technicians and informed appliance owners. The article will also cover practical replacement considerations-matching electrical ratings and terminal configurations, confirming whether the overload protector is integratedand basic safety precautions to take when servicing the control and compressor circuit-so that repair decisions can be made with a clear understanding of the component’s role and limitations.
Table of Contents
- Function and Role of the Refrigerator Start Relay in Compressor Start and Protection
- How the 297237702 Frigidaire Refrigerator Start Relay Works inside the Appliance
- Common Failure Symptoms and Measurable Electrical Indicators of a Faulty Start Relay
- Replacement Considerations, Model Compatibilityand Installation Procedure for the Start Relay
- Q&A
- Wrapping Up
Function and Role of the refrigerator Start Relay in Compressor Start and Protection
The 297237702 frigidaire Refrigerator Start Relay provides the temporary current path required to energize the compressor’s start winding and generate the torque necessary for the motor to reach running speed. In operation the device either momentarily connects the start winding (electromechanical/current-sensing relay) or presents a low-resistance path that rises rapidly (PTC/solid-state starter), then removes that path as the compressor accelerates; this switching action reduces start winding heating and limits inrush current.The relay does not replace an overload protector in many designs, so compatibility with the compressor’s expected start method and terminal layout is essential to avoid persistent hard starts or latent motor damage.
Failure or mismatch of the start relay produces consistent, measurable symptoms and can be diagnosed with simple tests: listening for repeated clicks, noting a humming compressor that fails to begin pumpingand checking continuity/resistance values against manufacturer service data. Practical service actions include verifying terminal configuration, measuring inrush and run currents if instrumentation is available, and using a known-good relay of the same type for substitution; replacing the relay with a unit rated for a different starting method (PTC vs. relay) or different voltage/current can allow initial rotation but shorten motor life. Useful speedy-reference items and common diagnostic steps are listed below to help field technicians confirm whether the start relay is the cause of a no-start condition.
- Symptoms: repeated clicking, compressor hum without start, compressor hot to touch after short run.
- Quick checks: inspect wiring/terminals,measure coil continuity,listen for relay operation during attempted starts.
- Substitution: swap with an identical-type relay to confirm diagnosis; ensure replacement matches terminal layout and electrical ratings.
| Item | description |
|---|---|
| Function | Provides temporary current path to compressor start winding and disconnects it once running speed achieved |
| Typical electrical | Designed for line-voltage operation in residential refrigerators (commonly 115-120 V AC systems); confirm exact rating for model |
| Compatibility | Must match compressor start method (electromechanical vs. PTC), terminal arrangementand service specifications |
How the 297237702 Frigidaire Refrigerator Start Relay Works Inside the Appliance
The 297237702 Frigidaire Refrigerator Start Relay is a switching device mounted on or near the compressor that briefly connects the compressor’s start winding to line voltage to produce the extra torque needed at motor start. In common Frigidaire designs the relay either uses a PTC (positive temperature coefficient) element or a current-sensing mechanism to remove the start circuit once the motor approaches operating speed; some assemblies also include an overload protector. Because start relays tailor the duration and magnitude of the start current to the compressor’s electrical characteristics, the 297237702 unit is intended as a direct-fit replacement for specific Frigidaire compressor models and should be matched by part number and terminal configuration (typically C, S, R) rather than assumed interchangeable across different compressors.
- Typical behavior: supplies short-duration current to the start winding, then opens the circuit when the compressor reaches nominal speed.
- Failure symptoms: repeated clicking, sustained humming without motor spin, or no compressor start while thermostat and power are otherwise normal.
- Compatibility check: confirm terminal layout and physical mounting against the original relay; some relays contain integrated overloads while others do not.
- Field test: measure continuity/resistance and observe relay operation during a start attempt; replacement is common when the relay fails to disengage or shows open/short conditions.
| Item | Description |
|---|---|
| Typical supply | 115 VAC (common on North American household refrigerators) |
| Terminals | 2-3 terminals, usually labeled C, S, R for compressor common/start/run interface |
| Primary function | Provide start winding current briefly; disconnect start winding when motor reaches speed |
| common symptoms of failure | clicking relay, compressor hums but does not run, intermittent starts |
For practical service, technicians verify the relay by checking resistance between terminals, observing mechanical engagement (or PTC heat behavior)and confirming correct voltage to the start terminal during crank attempts. When replacing with a 297237702 relay, ensure the replacement matches the original’s terminal arrangement and includes any necessary overload protection; using an incorrectly specified relay can produce inadequate starting torque or allow repeated restart attempts that stress the compressor.
Common Failure Symptoms and Measurable Electrical Indicators of a faulty start Relay
The 297237702 Frigidaire Refrigerator Start Relay performs the critical role of briefly energizing the compressor’s start winding to develop initial torque and allow the motor to spin up.In many Frigidaire systems this relay either closes a contact or provides a momentary low-resistance path (or, in the case of PTC-type devices, a temperature-dependent resistance change) between the supply and the compressor start terminal; without that timed connection the compressor will stall, humor draw excessive current. Verify compatibility with the compressor terminal layout and voltage/amperage ratings before fitting a replacement, since the relay must match the motor’s start/run configuration rather than act as a generic switching device.
- Compressor hums but does not start; no sustained run current.
- Clicking sounds at the relay or repeated cycling on start attempts.
- Refrigerator cooling degrades or run cycles become much longer.
- No measurable inrush current during start attempts (indicates relay not engaging or open start winding).
- Open circuit on start terminal or PTC not changing resistance with temperature.
Troubleshooting relies on clear electrical measurements: use a multimeter to check continuity between the common and start terminals and note whether a PTC device changes resistance as it warms. A voltmeter observed during a start attempt should show mains voltage at the start terminal only for a brief interval; a steady voltage or complete absence of voltage at that terminal indicates a switching fault. A clamp meter will expose inrush behavior - the current spike at start is normally several times the running current for a fraction of a second – so an absent spike with a humming compressor typically implicates the relay, while a persistent high current suggests locked-rotor or winding failure. The table below summarizes practical tests and expected indications for isolating relay faults from motor problems.
| Item | Description |
|---|---|
| Continuity test | Check between common and start: open circuit at rest or no change on PTC warm-up implies relay failure. |
| Voltage at start terminal | During start, line voltage should appear briefly at the start terminal; no pulse or constant presence indicates improper switching. |
| Inrush current | Measure with clamp meter: a brief high inrush followed by normal run current indicates relay functioning; absent inrush with humming implicates relay or open start winding. |
Replacement Considerations, Model Compatibilityand Installation Procedure for the Start Relay
The start relay supplies the brief surge of current required to energize the compressor’s start winding and get the motor up to speed; the 297237702 Frigidaire Refrigerator start Relay is a replacement unit commonly used on Frigidaire compressors with a single‑phase PSC motor. A failing relay typically produces symptoms such as a buzzing compressor, repeated short cycling, or no start with a momentary click; these behaviors reflect either an open/shorted relay element or degraded thermal/PTC performance. Confirm compatibility by matching the relay’s terminal layout,coil type (PTC vs.current‑sensing)and voltage/current ratings to the refrigerator’s compressor nameplate rather than relying on visual similarity alone, since different relay designs may appear identical but behave differently under load.
- Disconnect power before touching wiring.
- Compare the relay terminals and mounting bracket to the OEM part; transfer any rubber grommets or dust shields.
- Install the relay on the compressor spade terminals, ensuring firm contact and correct orientation.
- Restore power and verify the compressor runs within a few seconds; monitor current draw and listening for stable running sound.
| Item | Description |
|---|---|
| Part | 297237702 Frigidaire Refrigerator Start Relay |
| function | Provides start winding surge/current for compressor startup |
| Checks | Match terminal layout, voltage ratingsand coil type; test continuity/thermal behavior with multimeter |
During installation, ensure terminal cleanliness and correct harness seating; a loose spade connector can mimic relay failure by introducing high resistance and heat. If the compressor still fails to start after installing a verified compatible relay,measure inrush and running current and inspect the start capacitor (if used) and the condenser airflow-excessive current or a hard‑starting condition can indicate a failing compressor or a refrigerant system fault,which a relay replacement alone will not correct. For technicians, a quick bench test of the relay and a comparison of stamped compressor ratings reduces mis‑replacements and returns by ensuring electrical compatibility before sealing the unit back up.
Q&A
What is the 297237702 Frigidaire refrigerator start relay?
The 297237702 is a compressor start relay assembly sold for Frigidaire refrigerators. It is an electrical device that helps the compressor motor start by momentarily supplying extra current to the start winding; it usually includes the start relay and often the overload protector. Always confirm compatibility with your refrigerator model number before buying.
What symptoms indicate the start relay (297237702) might be failing?
Common symptoms include: refrigerator not cooling even though lights and fans run, loud humming or clicking from the compressor area, compressor running briefly then stoppingor the compressor failing to start at all.A burnt electrical smell or visible damage/blackening on the relay are also signs of failure.
How can a homeowner or technician test the 297237702 start relay?
First unplug the fridge. Remove the relay from the compressor and perform a visual inspection (burn marks, cracks, loose parts). Do a “shake” test (rattling inside frequently enough indicates failure). With a multimeter, check for continuity between appropriate terminals-an open circuit typically indicates a bad relay. Some relays (PTC type) won’t show straightforward resistance values,so if in doubt,replacing with a known-good relay or using a compressor start test tool is recommended. If you are not experienced with electrical testing, have a qualified technician test it.
Can I replace the 297237702 myselfand what are the basic replacement steps?
Yes, a competent DIYer can often replace it, but always prioritize safety. Basic steps: unplug the refrigerator,pull the unit away from the wall,remove the rear access panel,locate the compressor and its relay/overload on the side or base,note terminal positions,carefully detach connectors (use pliers if needed),remove the old relay/overload and fit the new 297237702 in the same orientation,reattach wires,reinstall the cover,restore power,and monitor the compressor start. If you are uncomfortable with electrical work or confined-space components, hire a technician.
Do I need any other parts when replacing the 297237702 start relay?
Sometimes the overload protector or mounting clip is included or should be replaced simultaneously occurring. If your relay is part of a kit that includes an overload, use the kit.Also inspect wiring, terminal connectorsand mounting hardware; replace corroded or damaged components. If the compressor or sealed system has other issues, a start relay replacement alone may not fix the problem.
How do I confirm the 297237702 is compatible with my refrigerator model?
Check your refrigerator’s model and serial number (usually on a sticker inside the fresh-food compartment or behind the grille) and search Frigidaire’s parts lookup, the appliance manualor a trusted parts retailer. Many online parts stores let you enter the model number to confirm fit. Do not assume interchangeability by appearance alone-verify the OEM part number or a verified cross-reference.
What should I do if replacing the 297237702 does not fix the cooling problem?
If symptoms persist after replacing the relay, the problem might potentially be the compressor itself, the start/run windings, the start capacitor (for units that use one), the control board, the sealed refrigerant system, or an electrical supply issue.At that point, have a qualified appliance technician perform further diagnostics – sealed-system repairs and compressor replacements typically require certified technicians and specialized tools.
How much does the 297237702 start relay cost and is there a warranty?
Price varies by seller and region; typical retail cost for an OEM relay kit is modest (often in the $10-$50 range) but can vary.Many authorized parts sellers offer limited warranties (30-365 days); check the seller’s warranty and return policy before purchase. For labor and diagnostics, expect additional service charges if you hire a technician.
Wrapping Up
The 297237702 Frigidaire Refrigerator Start Relay plays a critical role in initiating compressor operation and maintaining reliable cooling performance. As the electrical component that provides the initial surge of power to the compressor motor, a healthy start relay helps ensure efficient refrigeration cycles, prevents undue wear on the compressorand reduces the risk of food spoilage and costly repairs. Recognizing its importance makes it clear why a malfunctioning relay can quickly lead to observable symptoms such as clicking noises, humming, intermittent coolingor complete loss of refrigeration.
Because similar symptoms can stem from several causes, proper diagnosis is essential before replacement. Accurate testing-whether through basic troubleshooting checks or diagnostic tools-helps confirm the relay as the source of the fault and avoids unnecessary component changes. When replacement is required, installing the correct replacement part and following safety and manufacturer guidelines preserves equipment reliability and warranty coverage. For most users, consulting a qualified technician for testing and replacement ensures the job is done safely and correctly, minimizing downtime and protecting the refrigerator’s long‑term performance.
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