216731001 Frigidaire Refrigerator Termination Switch is a temperature-actuated termination/safety switch used in Frigidaire refrigeration systems. It is indeed a small, dedicated control component-typically a bimetal thermostat or mechanical/thermal switch-designed to change state at a defined temperature to stop a specific function, most commonly terminating a defrost cycle or acting as an evaporator high-limit sensor.
Inside the appliance the termination switch interfaces directly with the defrost system and the main control circuitry: it senses the temperature at or near the evaporator and sends an open/closed signal to the defrost control, heater circuit, or control board.When the measured temperature reaches the switch’s setpoint the device opens (or closes, depending on design) to end the defrost heater’s operation and prevent excessive heating; conversely, a failed or mislocated switch can prevent defrost termination, allow frost buildup, or cause inappropriate cycling of the compressor or fans. Physically the part is commonly mounted on the evaporator or in the defrost harness and is wired as a simple two‑lead switch or sensor in series with the heater circuit or control input.
In this article you will learn how the 216731001 termination switch functions within the defrost and temperature‑control subsystems, how to verify electrical and temperature behavior, typical symptoms of failure (for example, continued frost buildup, frequent compressor cycling, or no defrost), basic troubleshooting steps (visual inspection, continuity and resistance checks, temperature verification, and wiring inspection), and practical replacement considerations such as form‑factor fit, electrical rating, and safe handling procedures. The focus is technical and diagnostic, aimed at helping technicians, engineers, and appliance owners identify and address issues related to this component without overstating capabilities or outcomes.
Table of Contents
- Function and Role of the Termination Switch in Frigidaire refrigeration Systems
- How the 216731001 Frigidaire Refrigerator Termination Switch Operates Within Defrost and Cooling Circuits
- Common Failure Symptoms and Diagnostic Indicators for the Termination Switch
- Replacement Considerations, Wiring and Installation Procedure for the Termination Switch
- Q&A
- In Summary
Function and Role of the Termination Switch in Frigidaire Refrigeration Systems
The 216731001 Frigidaire Refrigerator Termination Switch is a thermally actuated cutoff device used to terminate heating or control circuits based on temperature feedback. In frost-control and defrost systems it is typically mounted adjacent to the evaporator or defrost heater and wired in series with the heater element; the switch is normally closed at low temperatures to allow defrost and opens at a preset temperature to interrupt current and prevent overheating. The part is usually a bimetal or capillary-style thermostat with specific terminal configuration and voltage/current ratings, so electrical compatibility and proper mounting location are critical for correct behavior and safe operation.
Failure or incorrect replacement of the termination switch manifests as excessive frost accumulation, continuous defrost activity, or a refrigerator that runs warm because the compressor cycle or defrost cycle is not being correctly terminated. common diagnostic checks include continuity testing across the switch at refrigerator temperatures versus a warmed condition, verifying secure connector fit and correct placement against the evaporator, and confirming the replacement part matches the original terminal layout and ratings.Practical guidance for field technicians: test with a multimeter, check mechanical retention clips or adhesive that secure the sensor, and replace only with an identical or manufacturer-approved equivalent to maintain system safety and timing.
- Symptoms to watch: persistent frost,frequent defrost cycles,or heater remaining energized.
- Basic tests: continuity at low temperature, open circuit when heated, and visual inspection of terminals.
- replacement note: match terminal type, mounting style, and electrical ratings.
| Item | description |
|---|---|
| Function | Thermal cutoff/control for defrost or temperature-related safety |
| Mounting location | Near evaporator coil or defrost heater for accurate temperature sensing |
| Contact action | Normally closed at low temperature; opens at preset trip temperature |
| Common failure symptom | Continuous heating, excessive frost, or failed defrost termination |
How the 216731001 Frigidaire Refrigerator Termination Switch Operates Within defrost and Cooling Circuits
216731001 Frigidaire Refrigerator Termination Switch is a temperature-actuated contact used to terminate the defrost cycle by monitoring evaporator coil temperature and changing the state of the defrost-heater circuit. Mechanically it is indeed typically clipped to the evaporator and electrically wired into the defrost-heater circuit and control module; when the coil warms to the switch’s termination setpoint the contacts open and remove power from the heater. In many Frigidaire systems the control board or mechanical timer relies on the switch’s open/closed state as a direct signal to end the defrost interval and allow the appliance to return to normal cooling behavior, so correct electrical continuity and mounting are essential for proper operation.
In normal operation the switch is conductive (closed) at cold evaporator temperatures and opens as the coil reaches the termination temperature during defrost, preventing overheating of components and minimizing run time of the defrost heater. Common practical implications include: a switch that has failed open will prevent the heater from operating and lead to heavy frost build-up on the evaporator, while a switch that has failed closed can allow indefinite heater operation and cause excessively warm coils or disrupted compressor cycling. For service, verify wiring diagrams and confirm continuity state at expected temperatures; typical diagnostic actions are performed with the component removed from the circuit and tested with a multimeter or by observing heater operation during a controlled defrost cycle.
- Primary function: terminate defrost by opening heater circuit at a specified coil temperature.
- Typical mounting: clipped to evaporator tubing or nearby cold surface for accurate sensing.
- Failure symptoms: either persistent icing (open/no-heat) or continuous defrost/overheat (stuck closed).
| Item | Description |
|---|---|
| Mounting | Clipped to evaporator coil or tubing for direct temperature sensing |
| Electrical action | Temperature-actuated contact that opens at the termination setpoint |
| Service check | Measure continuity cold vs. warm and compare to model wiring diagram |
Common Failure Symptoms and Diagnostic Indicators for the Termination Switch
The 216731001 Frigidaire Refrigerator Termination Switch is a temperature-actuated device that senses evaporator temperature and terminates the defrost heater once the frost has melted and the evaporator reaches the thermostat’s setpoint. In function it behaves as a normally-closed bimetal or thermostatic switch at low temperatures and opens at the termination temperature to cut power to the heater,preventing over‑heating and limiting unnecessary defrost time. When replacing this part, confirm mechanical mounting, lead length, connector type and the termination temperature specification to ensure compatibility with the refrigerator’s defrost control strategy and wiring harness.
- Heavy frost buildup on the evaporator while the cabinet temperature rises.
- Defrost heater remains energized longer than expected or cycles repeatedly.
- Ambient or evaporator temperature does not change during a defrost cycle (heater not running).
- Intermittent defrost behavior or erratic cycling of compressor and defrost heater.
- Corroded or loose terminals at the connector causing intermittent continuity.
| Item | Description |
|---|---|
| Cold (below termination) | Closed – continuity present; low resistance (near 0 Ω) when switch is functioning |
| Warm (at/above termination) | Open – no continuity; circuit is interrupted to stop the defrost heater |
Diagnose faults with a multimeter: isolate power, disconnect the switch from the harness, and check continuity at cold and after applying heat (hair dryer or warm compress) to verify change of state.A permanently open switch (no continuity when cold) typically explains a non‑defrosting evaporator and frost accumulation, while a permanently closed switch (continuity that does not break when warmed) can allow the heater to run longer than intended and may lead to component failure or excessive cabinet warming during defrost. Also inspect connectors and harness continuity, since wiring faults and corrosion often mimic switch failures; replace the 216731001 only when part, mounting, and termination characteristics match the original specification.
Replacement Considerations, Wiring and Installation Procedure for the Termination Switch
The 216731001 Frigidaire Refrigerator Termination Switch functions as the defrost termination thermostat that senses evaporator temperature and interrupts power to the defrost heater when the evaporator reaches its target temperature. It is typically a two‑terminal, temperature‑actuated switch mounted directly to the evaporator coil or the refrigerant tube; in cold conditions the switch is conductive (closed) to allow the heater to operate during a defrost cycle and it opens as the metal warms to remove heater power. replacement compatibility depends on terminal type, mounting clip geometry, and trip orientation-verify that the replacement has the same spade connector spacing and clip style as the original to ensure correct thermal coupling and secure mechanical fit.
Wiring and installation are straightforward but require correct thermal placement and electrical series connection with the defrost heater. Always disconnect power before working on the refrigerator; the switch is usually wired in series with the defrost heater or defrost control so you will remove the old device, compare terminal arrangement, and attach the new unit so it contacts the evaporator surface tightly. Test the new switch with a multimeter: it should read continuity at low temperature and open as the evaporator is warmed (hand warming or a controlled heat source); if it remains closed or open contrary to expected behavior, replace it. Common failure modes are a switch stuck closed (heater can overrun) or stuck open (defrost will not occur, causing frost buildup). Follow the checklist below for a typical replacement/verification routine.
- Power off and unplug appliance; remove evaporator access cover.
- Visual inspection: compare old and new switch mounting and terminal types.
- remove harness, unclip old switch, mount new switch with secure thermal contact.
- Reconnect harness, restore power, and perform continuity/functional test during a manually initiated defrost cycle.
| Item | Description |
|---|---|
| Terminals | Two spade connectors, wired in series with defrost heater |
| Trip behavior | closed when cold; opens when evaporator reaches warm threshold |
| Test method | Continuity check cold; open when warmed (multimeter) |
Q&A
What is the 216731001 Frigidaire termination switch and what does it do?
The 216731001 is frigidaire’s defrost termination thermostat (frequently enough called a termination switch). It senses the temperature of the evaporator coil and opens the defrost circuit when the coil has warmed enough during a defrost cycle. In other words,it permits the defrost heater to run while the coil is cold and then interrupts power to the heater once the ice/melted frost reaches the thermostat’s cutout temperature,preventing overheating and unnecessary run time.
Where is the termination switch located in the refrigerator?
The termination switch is usually clipped to the evaporator coil or mounted very close to it inside the freezer evaporator compartment. To access it you typically remove the freezer back panel or evaporator cover. Always disconnect power before opening the evaporator compartment to avoid electrical shock.
What symptoms indicate the termination switch may be failing?
Common symptoms: excessive frost/ice buildup on the evaporator (if the switch fails open and the heater never runs),continuous defrost/heater running or warm freezer temps (if the switch fails short/closed),or repeated compressor/defrost cycle irregularities. No defrost heater operation during service checks is another indicator.
How can I test the 216731001 termination switch safely?
Disconnect power to the appliance first. Remove the switch from its mounting (or at least disconnect its harness). With a multimeter set to continuity or resistance, check the thermostat at room/warm temperature-it should normally be open when warm. For a functional cold test, submerge the switch bulb or sensor area in ice water (0-5 °C); the switch should close (show continuity) when cold.If it doesn’t change state appropriately, the part is faulty.
Can I replace the switch myself, and what’s the basic replacement procedure?
Yes, a competent DIYer can replace it. Basic steps: unplug the refrigerator, remove the freezer back or evaporator cover, locate and remove the old termination switch (usually clipped to the coil), unplug its connector, install the replacement in the same position and orientation, secure the clip so the sensor contacts the coil, reconnect the harness, reassemble panels, and restore power. Take care not to damage the sensor capillary or bulb and avoid overtightening electrical connectors.if you’re uncomfortable working near the evaporator or with electrical components,hire a technician.
Will replacing the termination switch fix frost buildup or cooling issues?
Replacing a failed termination switch will correct problems caused by that switch (e.g., heater not running or running continuously). However, frost buildup and cooling problems can also be caused by a faulty defrost heater, defrost control/timer, temperature sensors, or air flow issues. Troubleshoot the entire defrost system rather than replacing parts one-by-one when possible.
How do I confirm I have the correct part number and compatible replacement?
Confirm compatibility by checking your refrigerator model number against the part number in the manufacturer’s parts list or an authorized parts retailer. The part number 216731001 is an OEM Frigidaire number-use your fridge model number to verify fit. If in doubt, contact Frigidaire customer support or a reputable parts supplier with your model/serial number to confirm compatibility.
Are there safety or handling precautions when working with the termination switch?
Yes-always unplug the refrigerator before servicing. Handle the sensor bulb or capillary gently; kinks or breaks will render the thermostat unusable. Avoid touching refrigerant lines or sharp sheet metal. If you must test electrical continuity with power connected (not recommended),take extreme caution and follow appropriate lockout/tagout and electrical safety procedures. When in doubt, hire a qualified appliance technician.
In Summary
The 216731001 Frigidaire refrigerator termination switch is a small but critical control component that helps regulate cycle completion and protects the refrigeration system from overrun or temperature excursions. By detecting specific temperature or timing conditions and signaling when a defrost or cooling cycle should end, the termination switch contributes to consistent cooling performance, reduced energy waste, and protection of other components-factors that ultimately support food safety and appliance longevity.
As similar symptoms can result from multiple parts or control issues, proper diagnosis is essential before replacing the 216731001 termination switch. Accurate testing against manufacturer specifications, using the correct replacement part, and following recommended installation procedures help ensure reliable operation and avoid unnecessary repairs. When in doubt, consult the appliance’s service documentation or a qualified technician to confirm the failure and perform the replacement safely and effectively.
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
Reliable-Parts-Hub
.
