216731001 Frigidaire Refrigerator Termination Switch is a temperature‑sensitive switch used in Frigidaire refrigeration systems; it is a small electromechanical/thermostatic device designed to open or close an electrical circuit in response to evaporator temperature. As a component,it functions as a termination or safety device rather than a primary control,and is typically implemented as a bimetallic or thermostat‑style switch that mounts to the evaporator or its sensor pocket.
Inside the appliance the termination switch monitors evaporator temperature and interfaces directly with the defrost circuit and control system. During a defrost event it will open at a specified temperature to terminate current to the defrost heater (or signal the control board that defrost is complete), preventing overheating of the evaporator and ensuring proper cycling; it therefore interacts with the defrost heater, defrost timer or electronic control, and indirectly with the compressor and temperature control loop by helping maintain correct evaporator performance. Proper mounting, insulation, and electrical continuity are essential for reliable operation.
In this article you will find a technical description of the switch’s function and typical construction, guidance on which models and assemblies commonly use part 216731001 (and what to check for compatibility), common failure symptoms to watch for (such as persistent frost buildup, incomplete defrost, or a defrost cycle that does not terminate), practical troubleshooting steps including continuity and temperature checks, and replacement considerations such as correct part number, connector type, mounting location, and safe handling procedures.
table of Contents
- Functional role and system integration of the termination switch in frigidaire refrigeration assemblies
- How the 216731001 Frigidaire Refrigerator termination Switch operates within thermostat,defrost and safety circuits
- Diagnostic indicators and common failure symptoms of the termination switch (open,short,intermittent and thermal drift)
- Compatibility matrix,replacement considerations and step‑by‑step installation diagnostics for the termination switch
- Q&A
- to sum up
functional role and system integration of the termination switch in Frigidaire refrigeration assemblies
The 216731001 Frigidaire Refrigerator Termination switch is a temperature-actuated safety device used to end the defrost cycle and prevent overheating of the defrost heater and surrounding components. Installed directly on or clipped to the evaporator coil, the switch provides a discrete open/closed contact to the refrigerator control board: it is normally closed at low coil temperatures and opens when the coil reaches the predetermined termination temperature, signaling the control to stop powering the heater. Matching the physical mount, terminal type, and electrical rating of the original part is necessary for proper operation and compatibility with a given Frigidaire control system.
In normal operation the termination switch changes state only when the evaporator temperature rises through its setpoint; failures moast commonly present as either a switch that fails to open (causing extended heater run-time and possible component stress) or a switch that fails to close (preventing defrost and allowing ice buildup).Technicians typically verify function by checking for continuity at cold temperatures and loss of continuity at elevated temperatures, confirming correct placement on the coil, and ensuring connector polarity and clip orientation match the OEM installation. Common diagnostic indicators and considerations include:
- Symptoms: continuous heater activity, frequent frost accumulation, or premature heater shutdown.
- Field checks: continuity tests at ambient and warmed coil conditions; verify secure mechanical contact with the evaporator surface.
- Compatibility: confirm terminal style, mounting clip, and voltage/current rating before replacement.
| Item | Description |
|---|---|
| Function | Terminates defrost heater when evaporator coil reaches set temperature |
| Contact behavior | Closed at low temperatures; opens at termination temperature |
| Location | Clipped to or mounted on evaporator coil near heater |
| Diagnostic check | Continuity cold = closed; continuity lost when warmed; verify mounting and connector |
How the 216731001 Frigidaire Refrigerator Termination Switch operates within thermostat, defrost and safety circuits
The 216731001 Frigidaire Refrigerator Termination Switch is a temperature-actuated, two-terminal bimetal switch that directly senses evaporator coil temperature and interrupts the defrost heater circuit when the coil reaches its designed warm threshold. Installed in thermal contact with the evaporator or its sheath, the switch is normally closed at low temperatures to allow current to the defrost heater during a timed defrost; as the coil warms during defrost the bimetal element opens at its specified trip point, removing power from the heater and preventing excessive coil temperature.Because the device is an SPST thermal cutout, compatibility depends on matching the physical mounting clip and the manufacturerS trip temperature and electrical rating when replacing it in Frigidaire models that reference part number 216731001.
- Function: series safety device for defrost heater; opens when evaporator reaches trip temperature.
- Wiring: two-terminal, low‑voltage or line‑voltage circuits depending on model; typically placed in series with heater lead.
- Common faults: failed open prevents defrost (rapid frost build-up); failed closed allows over‑heating of heater circuit.
- Field checks: measure continuity cold vs. after gentle warming of the sensor to confirm switching action.
| Item | Description |
|---|---|
| Type | SPST bimetal termination thermostat (thermal cutout) |
| Terminals | Two fast-connect spade terminals |
| Behavior | Closed at low temps, opens at manufacturer-specified trip temperature to de-energize defrost heater |
In typical control schemes the defrost timer or electronic control applies power to the heater circuit only when defrost is scheduled; the termination switch is wired in series with the heater so the control cannot overrun the designed thermal endpoint. In some designs the same switch also serves as a local safety interlock that prevents the compressor or other components from operating under abnormal thermal conditions by being placed in series or as an interrupting element in supervisory circuits. Practical troubleshooting includes verifying correct mechanical contact with the coil, confirming the switch changes state when warmed, and ensuring any replacement matches the electrical rating and trip characteristics of the original part to preserve proper defrost timing and safety behavior.
Diagnostic indicators and common failure symptoms of the termination switch (open, short, intermittent and thermal drift)
The 216731001 Frigidaire Refrigerator Termination Switch is a temperature‑actuated protective device placed in series with the compressor or defrost circuit to stop current flow when a set thermal condition is reached. In normal operation the switch presents low resistance (closed) below its trip temperature and opens as the monitored element warms, preventing overrun or overtemperature conditions. Failure modes include a hard open (no continuity), a hard short (near‑zero resistance), intermittent contact (fluctuating continuity under vibration or thermal cycling), and thermal drift (actuation temperature moved from specification).Technicians should treat the part as an electromechanical switch: verify electrical behavior first, then confirm mechanical mounting and thermal coupling to the evaporator or sensor pocket to establish compatibility with the system it serves.
Practical diagnosis uses a digital multimeter, backprobing the switch connector and observing continuity while applying controlled temperature change or mechanical stress to the harness. Typical signs seen at the appliance are: continuous compressor operation or failure to start (open or drifted open), continuous run through defrost cycles (shorted termination), erratic cycling or intermittent defrosts (intermittent contact), and progressive temperature offset in the cabinet (thermal drift). Always inspect wiring and connectors for corrosion, check for proper seating of the switch in its pocket, and compare measured actuation behavior to the service specification for the refrigerator model when available.
- Open (no continuity): compressor/defrost circuit will not close; multimeter shows OL or infinite resistance.
- Short (near 0 Ω): circuit remains closed; compressor may run continuously or defrost may not terminate.
- Intermittent: fluctuating continuity with vibration, bending harness, or thermal cycling causes unpredictable cycling.
- Thermal drift: switch actuates at a different temperature than designed, producing run‑time and temperature offset symptoms.
| item | Description |
|---|---|
| Open | No continuity on meter; symptom – circuit stays open, compressor/defrost fails to engage. |
| Short | Near 0 Ω resistance; symptom – circuit permanently closed, continuous run or failed termination. |
| Intermittent | Continuity appears/disappears under stress or temperature change; symptom – erratic cycling or intermittent function. |
| thermal drift | actuation temperature shifted from spec; symptom - longer/shorter run times and temperature offset in compartment. |
Compatibility matrix,replacement considerations and step‑by‑step installation diagnostics for the termination switch
The 216731001 Frigidaire Refrigerator Termination Switch is a temperature‑sensitive electrical switch used to terminate a heating or cooling event and provide a reliable input to the control system. In manny Frigidaire refrigeration systems this component monitors evaporator or heater temperature and changes state to interrupt power to the defrost heater or to signal the main control board; the mechanical action is simple but the thermal setpoint and mounting location determine how it behaves in the circuit. Technicians should understand that the switch is a passive sensor/switch - it does not regulate temperature directly but opens or closes its contacts at a defined temperature to protect components and end defrost cycles, so connector style, terminal layout, and thermal coupling to the evaporator are critical compatibility attributes.
When replacing or diagnosing this switch,verify model compatibility,terminal type,and mounting orientation before installation; mismatched connectors or incorrect thermal coupling can cause premature cycling or failed defrosts. Common diagnostic steps include visual inspection for corrosion or broken terminals, continuity checks with a multimeter at cold and warmed conditions, and functional verification by simulating the operating temperature (for example, applying controlled heat to observe contact change). Cross‑reference the appliance model and wiring diagram, secure the switch to the correct mounting boss to ensure accurate temperature sensing, and confirm control‑board behavior after replacement to complete the installation diagnostics.
- Symptoms: persistent frost on evaporator, defrost heater remaining energized, or incorrect defrost termination.
- Quick checks: visual condition, correct connector fit, and secure mechanical mounting.
- Electrical test: continuity at ambient, then observe change when warmed or cooled (use a multimeter on resistance/continuity range).
- Installation note: match terminal type and orientation, and verify proper thermal contact to the evaporator or heater bracket.
| Item | Description |
|---|---|
| Part | 216731001 frigidaire refrigerator Termination Switch – temperature‑activated contact used for defrost termination or thermal protection |
| Key checks | Connector type, mounting location, thermal coupling, and contact switching behavior under temperature change |
| Typical diagnostic | Continuity test cold vs. warmed,visual inspection for corrosion,and verification of control‑board response after replacement |
Q&A
What is the 216731001 Frigidaire termination switch and what does it do?
The 216731001 is a defrost termination switch (also called a defrost thermostat or defrost limiter) used on many Frigidaire refrigerators. It monitors the evaporator temperature during a defrost cycle and opens at a predetermined temperature to cut power to the defrost heater, preventing overheating and over-defrosting.
How can I tell if the 216731001 termination switch is bad?
Common symptoms of a failed termination switch are excessive frost/ice buildup on the evaporator or evaporator cover, the freezer running warm (because defrost isn’t completing), or the defrost heater running continuously (if the switch fails closed). Also check for repeated short or long defrost cycles. Always rule out the defrost heater and control/timer first-these symptoms can be caused by other components.
How do I test the 216731001 termination switch with a multimeter?
Unplug the fridge first. Remove access to the switch on the evaporator and disconnect its terminals. At cold temperature (you can press it against a cold evaporator or use ice) it should show continuity (near 0 ohms). When warmed above its cut-out temperature (use warm water sparingly or hold in warm fingers briefly), it should open (infinite resistance). If it does not change state appropriately, the switch is faulty.
Can I replace the 216731001 myself and what are the basic steps?
yes, a competent DIYer can replace it.Basic steps: unplug the refrigerator,remove the evaporator cover in the freezer compartment,disconnect the switch’s spade connectors,remove any retaining clip or adhesive,install the new switch in the same position on the evaporator,reconnect the terminals,reassemble the cover,and restore power. Proper mounting and good thermal contact with the evaporator is critically important for correct operation.
Is the 216731001 the same as a defrost thermostat or termination thermostat?
Yes. “Termination switch,” “defrost thermostat,” “defrost limiter,” and “defrost termination thermostat” are commonly used interchangeably. They all refer to the temperature-activated device that terminates the defrost cycle when the evaporator reaches the correct temperature.
What are typical cut-in / cut-out temperatures for this type of switch?
Cut-in and cut-out temperatures vary by design. Defrost termination switches generally close (allow current during cold) when the evaporator is below refrigeration temperatures and open when the evaporator warms to the defrost cut-out point. Typical defrost cut-out ranges are roughly 40-60°F (4-15°C) depending on the specific part; check OEM specifications for exact values.
what can cause the 216731001 to fail?
Failures can result from age,corrosion on terminals,mechanical damage,or moisture intrusion. Excessive heat from a nearby component or physical stress during service can also damage the element. A failed defrost heater or shorted wiring can create abnormal conditions that stress the switch as well.
How do I ensure I get the correct replacement and check compatibility?
Verify the fridge model number (usually on a tag inside the cabinet) and cross-reference it with the part number 216731001 on Frigidaire’s parts site or a trusted parts supplier.Buying the OEM part or an exact OEM-equivalent is recommended. If unsure, provide your refrigerator model number to the parts supplier or technician to confirm compatibility.
In Conclusion
The 216731001 Frigidaire Refrigerator Termination Switch plays a critical role in the appliance’s defrost and temperature-regulation systems by monitoring temperature and signaling the control circuitry to terminate a defrost cycle when appropriate. As a temperature-sensitive safety component, it helps prevent excessive heat exposure to internal components, contributes to stable temperature control, and supports efficient compressor operation and consistent food preservation.
Because symptoms of a failing termination switch-such as excessive frost buildup, irregular cooling, or short defrost cycles-can overlap with other refrigerator faults, accurate diagnosis is essential. Proper troubleshooting, including visual inspection, continuity testing, and evaluation of system behavior across cycles, ensures the root cause is identified rather than treating a secondary symptom.
When replacement is necessary,selecting the correct 216731001 component or a manufacturer-recommended equivalent and following safe installation procedures restores reliable operation and minimizes recurrence of problems. Engaging a qualified technician and adhering to manufacturer guidelines protects safety, preserves warranty coverage when applicable, and helps maintain appliance efficiency and longevity.
Professional Appliance Service
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