297237702 Frigidaire Refrigerator Start Relay is a compressor start relay assembly used on Frigidaire refrigeration units; it is indeed an electrical start device that controls the submission of starting current to the compressor motor so the hermetic compressor can overcome initial static and load torque. In form and function it serves as a switch or timing device in the compressor’s single‑phase motor starting circuit, and on many units it is indeed packaged with or mounted adjacent to the compressor and associated overload protector.
Inside the appliance, the start relay interacts directly with the compressor’s start and run windings (and, where present, any start capacitor), the thermal overload protectorand the refrigerator’s control circuitry or thermostat that calls for cooling. When a start command is issued the relay momentarily connects the start winding or modifies the circuit to provide the necessary starting torque, then releases once the motor reaches running speed; proper operation is thus essential to compressor startup, current draw characteristicsand the overall refrigeration cycle. Faults in the relay or its connections will affect the electrical subsystem and manifest as compressor starting problems,excessive current draw,or intermittent operation.
In this article readers will find a technical description of the 297237702 relay’s intended function and where it is indeed typically located, guidance on checking compatibility with specific Frigidaire models, common failure symptoms to recognise, diagnostic approaches a technician can use to isolate relay‑related faultsand practical considerations when selecting and installing a replacement (including matching electrical characteristics and inspecting related components such as the overload protector).The focus will be on objective diagnostic criteria and replacement compatibility rather than promotional claims.
Table of Contents
- Function and Role of the Start Relay in Frigidaire Compressor Motor Operation
- How the 297237702 Frigidaire Refrigerator Start Relay Works Inside the Appliance
- Common Failure Symptoms and Electrical Indicators of Start Relay Malfunction
- Troubleshooting Procedures and Diagnostic Tests for Start Relay Faults
- Q&A
- The Conclusion
Function and Role of the Start Relay in Frigidaire Compressor Motor Operation
The 297237702 Frigidaire Refrigerator Start Relay functions as the control element that momentarily connects the compressor’s start winding to the line supply so the motor can develop sufficient torque to accelerate to running speed. In typical hermetic refrigeration compressors the relay either senses the inrush current (current-type relay) or changes resistance/temperature (PTC-type) to drop out after the motor reaches roughly 60-80% of synchronous speed, leaving the run winding energized. Correct electrical characteristics and terminal configuration are required for interchangeability; replacing the relay with a unit that has different activation thresholds or contact timing can increase starting current, cause repeated cyclingor overstress the compressor motor and overload device.
Operational behavior and practical troubleshooting are straightforward: a healthy relay gives a short audible click and allows the compressor to start and run; a failed relay often produces repeated clicking, a continuous hum with no startor a hot/burnt relay housing. Technicians commonly verify relay function by observing starting current, measuring continuity between start and run terminalsor temporarily substituting a known-good relay; also confirm the relay is compatible with the compressor’s specified coil resistance and voltage. Common indicators and relevant checks include:
- Symptom: humming compressor or frequent clicks – check relay engagement and coil continuity.
- Feature: sensing method – current relay vs. PTC vs. solid-state, affects drop-out behavior.
- Practical check: measure line-to-start and start-to-run resistanceand compare to manufacturer specifications before replacing.
| Item | Description |
|---|---|
| Primary function | Temporarily connect the compressor start winding to produce starting torque |
| Sensing method | Current-sensing or PTC/thermal element; determines drop-out timing |
| Compatibility note | Match voltage, terminal layoutand activation thresholds to Frigidaire compressor specifications |
How the 297237702 Frigidaire Refrigerator Start Relay Works Inside the Appliance
The 297237702 Frigidaire Refrigerator Start Relay acts as the temporary electrical link that energizes the compressor’s start winding in order to produce the initial torque needed to turn the motor shaft. Installed on the compressor terminal block, the relay either uses a current-sensing mechanism or a PTC/solid‑state element to disconnect the start winding once the motor reaches sufficient RPM; this prevents the start winding from remaining in circuit and overheating.For technicians, the relay’s behavior is best understood as a timed or sensing device that switches between the common, startand run terminals to create the short-duration high-torque condition required for reliable starting, and compatibility should be confirmed by matching terminal configuration and electrical ratings to the compressor manufacturer’s specifications.
Operationally, failures of the start relay produce distinct, measurable effects: the compressor may hum without starting, draw excessive currentor trip protection devices. Practical diagnosis includes observing audible clicks from the relay, checking for heat or burn marksand confirming continuity and resistance values at the terminals before replacement.Common failure modes are a stuck contact that keeps the start winding engaged, an open circuit that prevents starting torqueor a degraded PTC/solid‑state element that fails to release; replacing the relay with a correctly rated 297237702 part or an approved equivalent typically restores normal starting behavior when the compressor itself is sound.
- Symptoms: humming and no start, intermittent starts, tripping breakers, visible heat or burn marks on relay
- Features: momentary engagement of start winding, mounts to compressor terminal block, requires matching terminal layout and voltage/current rating
- Testing cues: audible click on engagement, measurable continuity between expected terminals when cold
| Item | Description |
|---|---|
| Terminals | C (Common), S (Start), R (Run) - relay links S to C onyl during start |
| Failure modes | Stuck closed, open circuit, overheating/PTC degradation causing no or intermittent start |
Common Failure Symptoms and Electrical Indicators of Start Relay Malfunction
The 297237702 Frigidaire Refrigerator Start Relay is a small electromechanical component that temporarily routes voltage to the compressor’s start winding to overcome initial static torque and get the compressor running. In normal operation the relay closes for a fraction of a second at each start and then releases so the compressor runs on the run winding; when the relay sticks open, is intermittently conductiveor has internal high resistance, the compressor will fail to start, will only hum, or will cycle irregularly. This part is intended for Frigidaire compressor assemblies and replacement should match the relay terminals and mounting style to ensure correct compatibility with the refrigerator’s start and run circuits.
- Compressor hums but does not start; motor attempts indicated by vibration without rotation.
- Audible clicking at the relay socket on start attempts (relay opening/closing repeatedly).
- Intermittent starting - fridge will start after tapping the relay or after extended time.
- Visible heat damage, oil residueor burn marks on the relay or terminal block.
- Electrical test failures: open circuit on continuity check or no voltage present at the start terminal during a start attempt.
| Item | Description |
|---|---|
| Continuity test | Measure across relay terminals for low resistance; an open reading indicates an internal break and requires replacement. |
| Voltage at start terminal | During a start attempt there should be line voltage present at the start terminal; absence points to a control or socket problem rather than the relay itself. |
| Inrush/current behavior | Excessive or reduced inrush current measured with a clamp ammeter suggests the start device isn’t supplying the correct initial torque or the compressor is mechanically restricted. |
| Visual inspection | Deformation, meltingor oil leakage around the relay/terminals indicates overheating or compressor failure and warrants replacement and further compressor diagnostics. |
To diagnose suspected relay faults, use a multimeter to check continuity and voltage under load and a clamp ammeter to observe inrush current during a start attempt; a relay that shows intermittent continuity or fails to apply voltage to the start winding under load should be replaced. Practical field checks such as temporarily swapping with a known-good relay (when compatible) or noting that the compressor will start only after tapping the relay provide quick confirmation, but any evidence of overheating or abnormal current draw requires follow-up inspection of the compressor and the start circuit to avoid repeated relay failures.
Troubleshooting Procedures and Diagnostic Tests for Start Relay Faults
the 297237702 Frigidaire Refrigerator Start Relay is the electromechanical or solid‑state device that momentarily routes extra current to the compressor’s start winding to achieve initial torque. In practical systems this relay may be a PTC type, an electronic solid‑state moduleor a current‑sensing relayand compatibility depends on the compressor model and its rated start characteristics rather than cabinet model alone. When the relay fails it typically prevents the compressor from building sufficient starting torque,producing symptoms such as repeated clicking,a humming compressor that never runs,or a unit that starts only intermittently; wear patterns,discoloration,or a burned odor at the relay are additional indicators that the part has degraded and should be matched to the compressor specifications before replacement.
- Common symptoms: repeated start attempts (clicking), no-run/humming compressor, tripped overloads, elevated starting currentor relay overheating.
- Quick checks: visual inspection,audible click behavior,and a shake test for loose parts in mechanical relays.
- Measured tests: continuity/resistance of start terminals, voltage presence at the relay during start attempts, and clamp‑meter measurement of compressor starting current.
| Item | Description |
|---|---|
| Continuity test | Verify start relay terminals show appropriate continuity; an open circuit on the start coil or obvious short indicates failure. |
| Swap/known‑good test | replace with a verified compatible relay to confirm fault if bench measurements are inconclusive. |
Diagnostic procedure begins with power removal and a visual inspection, then proceeds to multimeter checks: confirm line voltage at the relay input during a start attempt, measure continuity between start and run terminals where applicableand check that the relay switches under load. for compressor‑related diagnostics use a clamp meter to record locked‑rotor and running currents-excessive starting current with a functioning relay suggests a compressor problem rather than the relay. Always disconnect mains power before removing or bench‑testing the relayand when in doubt perform a controlled swap with a compatible 297237702 replacement or consult the compressor’s datasheet to match start characteristics before installing a new relay.
Q&A
What is Frigidaire part 297237702 and what does a refrigerator start relay do?
Part 297237702 is a replacement start relay assembly used on some Frigidaire refrigerators. A start relay provides the initial electrical boost to the compressor motor so it can start turning. it might potentially be a simple relay,a PTC thermistor,or be combined with an overload protector. Without a working start relay the compressor may hum but not startor it may trip breakers or thermal overloads.
What are the common symptoms of a failing start relay (part 297237702)?
Typical signs include: the refrigerator not cooling while the compressor hums or clicks, repeated clicking or rapid cycling, the compressor not starting though it gets power, a burning/electrical smell near the compressoror the relay getting unusually hot. These symptoms can indicate a bad relay but can also point to other issues, so further testing is recommended.
How can I safely test the start relay to see if it is bad?
Always disconnect power before handling electrical parts. Remove the access panel and pull the relay from the compressor terminals (note wire positions). Visually inspect for burn marks, melted plastic or loose components and shake it-a rattling noise can indicate internal failure. With a multimeter you can check for continuity across terminals (open/very high resistance suggests failure).Some relays are PTC-type and won’t show a simple resistance reading; in that case a visual/functional test or replacement is typically needed. If you’re unsureor if bench-testing would require applying power to a compressor, have a qualified technician perform the test.
Is part 297237702 compatible with my Frigidaire refrigerator model?
compatibility depends on your refrigerator model. to confirm, look up the appliance model number (usually on a sticker inside the fridge) and check Frigidaire’s parts lookup, the OEM parts diagram, or the part seller’s compatibility list. Do not rely only on appearance – verify terminal layout and electrical ratings match. If in doubt, provide the appliance model number to the parts supplier or service technician.
Can I replace the start relay myself and what are the basic steps?
Yes, if you are comfortable with basic appliance work and have disconnected power. Typical steps: unplug the refrigerator, remove the back access panel, identify the relay/overload assembly on the compressor, note wire locations, gently pull the relay off the compressor terminals, install the new relay in the same orientation and reconnect wires, replace the access panel, restore power and observe operation. Avoid bending compressor terminals and don’t force connectors. If you’re not confident, hire a technician.
What should I do if replacing the start relay does not fix the problem?
If the fridge still won’t cool after replacing the relay, possible causes include a seized/failed compressor (locked rotor), a failed start capacitor (if used), sealed-system problems (low refrigerant, leak), failed control board or thermostator a bad evaporator fan/defrost issue.A technician can measure compressor current, check pressuresand perform further diagnostics to pinpoint the fault.
Are aftermarket or universal relays acceptable alternatives to Frigidaire part 297237702?
Aftermarket and universal relays are available and can work if they match the original part’s electrical specifications, terminal arrangement, and include any required overload protection.OEM parts are recommended for correct fit and known compatibility. If you use an aftermarket relay,verify ratings and return policy,and prefer suppliers with good reviews or explicit compatibility listings.
How much does part 297237702 usually cost and is there a warranty?
prices vary by supplier but start relays for refrigerators are typically inexpensive compared with other components; expect a modest parts cost (search current listings for accurate pricing). Many sellers and manufacturers offer a limited warranty (often 30-90 days or longer depending on source). Always check the seller’s warranty and return policy before purchaseand keep your appliance model number and proof of purchase in case warranty service is needed.
The Conclusion
The 297237702 Frigidaire refrigerator start relay plays a critical role in initiating compressor operation by supplying the necessary torque to the motor at startup. Even though small and inexpensive relative to other refrigerator components, its proper function is essential to consistent cooling, energy efficiencyand the prevention of more serious compressor or system damage.A faulty start relay commonly manifests as failure to start, intermittent operationor higher electrical draw, each of which can compromise appliance performance and food safety if left unaddressed.
Because symptoms of a failing start relay can overlap with other electrical or mechanical issues, accurate diagnosis is important before replacement to ensure the correct source of the problem is addressed. When testing indicates the relay is defective, replacing it with the appropriate 297237702 unit or a compatible OEM-equivalent restores reliable starting performance and helps avoid downstream damage to the compressor. Timely, properly executed diagnosis and replacement-whether performed by a qualified technician or a knowledgeable service professional-supports longer appliance life, safer operationand improved efficiency.
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