216731001 Frigidaire Refrigerator Termination Switch is a temperature-actuated termination device used in Frigidaire refrigeration appliances. It is indeed a small, normally closed (when cold) thermal switch or bi-metal thermostat designed to open at a predetermined temperature to stop a timed process-most commonly the defrost cycle. As a discrete electromechanical component, it provides a simple, reliable means of sensing temperature and interrupting power when a target temperature is reached.
Inside the appliance the termination switch is typically mounted at or near the evaporator coil and wired into the defrost circuit, where it collaborates with the defrost heater, the main control board (or mechanical timer), and othre temperature sensors. During a defrost event the switch monitors coil temperature and opens when the ice has melted and the coil reaches the termination setpoint,cutting power to the heater to prevent overheating and excessive heater run time. It also serves as a safety cutoff if heat transfer conditions are abnormal, and its state can affect compressor and evaporator performance by influencing ice accumulation and temperature regulation.
In this article readers will find a technical clarification of the 216731001 termination switch’s operating principle, typical mounting and wiring arrangements, and how to determine compatibility with specific Frigidaire models. The article will describe common failure symptoms (for example, continuous frosting, no defrost, or erratic defrost cycles), step-by-step troubleshooting methods including continuity and temperature checks, and practical replacement considerations such as connector type, mounting clip orientation, and correct electrical ratings. The focus is on providing technicians, engineers, and informed appliance owners with the facts needed to diagnose and safely replace the component when required.
Table of Contents
- function and Role of the Termination Switch in Frigidaire Refrigeration Systems
- How the 216731001 Frigidaire Refrigerator Termination Switch Interfaces with Evaporator, Defrost and Compressor Control Circuits
- Common Failure symptoms and Electrical Fault Modes of the Termination Switch
- Compatibility and Supported Frigidaire Appliance Models for Part 216731001
- Replacement Considerations, Required Parts and Step-by-step Installation for the Termination Switch
- Troubleshooting Procedures and Multimeter Diagnostics for Termination Switch Fault Isolation
- Q&A
- Final Thoughts
Function and Role of the Termination Switch in Frigidaire Refrigeration Systems
The 216731001 Frigidaire Refrigerator Termination Switch is a temperature-actuated device used in the defrost system to stop the defrost heater once the evaporator has warmed sufficiently. Installed in thermal contact with the evaporator or the heater assembly, the switch is typically normally closed at low temperatures so the defrost circuit can energize, then opens when the sensor reaches its set threshold to terminate the defrost interval. In practice this switch both controls defrost duration and serves as a safety cutoff if the evaporator temperature rises above a safe point; correct electrical rating, terminal style, and mounting orientation must match the refrigerator’s wiring diagram to ensure proper behavior and compatibility with the appliance control board and timer/thermostat components.
Technicians diagnose termination switch problems by checking continuity across the device at cold and warm temperatures and by observing defrost-cycle behavior during service. A termination switch that fails open will prevent the defrost heater from running and cause progressive frost buildup, while a switch that fails closed can allow excessively long defrosts, raising cabinet temperatures and compromising food safety. Replacement should use the specified part number or an exact-equivalent with matching switch action and ratings; secure thermal contact and correct routing of leads are practical installation steps that affect responsiveness and reliability.
- Symptoms: excessive frost buildup, continuous compressor cycling, or warm cabinet after defrost.
- Field test: measure continuity cold (closed) and after warming (open) or follow model-specific test procedure.
- Compatibility note: confirm terminal type and mounting clip/location against the service sheet before replacing.
| Item | Description |
|---|---|
| Function | Terminates defrost heater when evaporator reaches its set temperature |
| Switch action | Normally closed at low temp; opens as evaporator warms (threshold varies by model) |
| Service tip | Verify continuity behavior with a multimeter and ensure good thermal contact when installing replacement |
How the 216731001 Frigidaire Refrigerator Termination switch Interfaces with Evaporator, Defrost and Compressor Control Circuits
The 216731001 Frigidaire Refrigerator Termination Switch is a thermally actuated component that provides a direct interface between the evaporator temperature and the refrigerator’s defrost and compressor control circuits.Installed adjacent to the evaporator coil, the switch changes contact state as the coil warms during a defrost event, which either removes power from the defrost heater or sends a termination signal to the main control board. In many designs this switch is a simple two‑terminal device wired in series with the heater element or to a control input, allowing passive, temperature‑driven control without additional electronics; correct mechanical placement and matching contact characteristics are required for compatible operation and reliable defrost termination.
- Typical behavior: closes or opens at a set evaporator temperature to end the defrost cycle.
- Electrical role: either breaks the heater circuit directly or provides a feedback signal to the control board.
- Practical symptom of failure: extended frost buildup, unsuccessful defrost cycles, or compressor short‑cycling after defrost.
- Installation considerations: must match contact type, mounting clip, and thermal response for the specific Frigidaire model.
| Item | description |
|---|---|
| Contact action | Temperature‑driven open/close used to terminate defrost or signal the controller |
| wiring location | In series with defrost heater or connected to the control board defrost input |
| Function | End defrost and coordinate compressor restart timing to avoid overheating or short cycling |
In submission, when the defrost heater raises the evaporator temperature the switch will change state and terminate the defrost heater, after which the control logic typically waits for the coil to cool or a timed delay to expire before re‑energizing the compressor. If the termination switch is wired as a feedback device to the controller, the controller may also use its state to inhibit compressor relay operation while the heater is active; this prevents the compressor from running against a warm, poorly performing evaporator. When replacing or troubleshooting a 216731001 Frigidaire Refrigerator Termination switch, technicians should verify continuity change with applied heat at the mounting location and ensure the replacement matches the original switch’s mounting geometry and contact behavior to maintain coordinated operation of evaporator, defrost, and compressor circuits.
Common Failure Symptoms and Electrical Fault Modes of the Termination Switch
The 216731001 Frigidaire Refrigerator Termination Switch is a temperature-actuated electrical switch used to terminate the defrost or heater interval and to provide a hardware safety cut-off in the refrigerator’s defrost circuit. In operation the device changes state at a defined temperature so the defrost heater (or associated control circuit) is removed from the supply when the evaporator or sensor location reaches that threshold. Physically it is typically a two‑wire device with spade terminals or a small harness; verify connector style and mounting location against the appliance wiring diagram before replacing to ensure compatibility with your specific Frigidaire model.
- Excessive frost or ice buildup on the evaporator coils.
- Defrost heater running continuously or freezer warming.
- Intermittent or erratic defrost cycles and temperature swings.
- Blown fuses,burned connectors,or tripped breakers in the defrost circuit.
Electrical fault modes are generally limited to open circuit, short to chassis/ground, welded contacts (stuck closed), or high/intermittent contact resistance. an open termination switch shows no continuity at ambient test temperatures and will prevent the defrost heater from energizing, producing progressive frost build-up and reduced cooling. A shorted or welded-closed switch provides continuous feed to the heater and can cause persistent defrost heating, elevated cabinet temperatures, or melted insulation around terminals. Intermittent contact or high resistance produces unpredictable defrost timing and can be diagnosed with a multimeter by measuring continuity and resistance while warming the sensor area (or by substituting a known-good switch). Always isolate power before disconnecting the harness and verify wiring colors and connector pinout against the service schematic prior to replacement or repair.
| Item | Description |
|---|---|
| Open circuit | No continuity at room or cold temperature; symptom is heavy frost accumulation and failed defrost cycles. |
| Short to ground / stuck closed | Continuity present to chassis or continuous closed state; symptom is continuous heater operation and warm freezer temps. |
| High/intermittent resistance | Variable resistance or intermittent continuity under warming; symptom is erratic defrost behavior and temperature fluctuations. |
Compatibility and Supported frigidaire Appliance Models for Part 216731001
The 216731001 Frigidaire Refrigerator Termination Switch is a temperature-actuated safety device that terminates the defrost heater circuit when the evaporator reaches its target temperature. Functionally it behaves as a normally-closed thermal switch at low coil temperatures and opens when the sensing element reaches the designed cutoff temperature, interrupting current to the defrost heater. The component’s electrical and mechanical characteristics-thermal setpoint, lead length, terminal type, and mounting method-determine whether it will operate correctly in a specific refrigerator model; these parameters must match the original part to preserve defrost timing and safety behavior.
Compatibility with Frigidaire appliance models is determined by matching the physical and electrical specifications rather than brand name alone.Technicians should verify the part number on the refrigerator’s parts diagram or service manual and compare the 216731001 termination switch’s setpoint, mounting clip/style, and quick-disconnect terminal type before installation. For practical replacement checks, measure continuity cold and verify the switch opens at the expected warm temperature; if the original part uses a specific bracket or lead routing, replicating that arrangement prevents false readings from residual frost or poor thermal contact.
- Verify OEM part number and cross-reference documentation.
- Compare thermal setpoint and response behavior to the original switch.
- Confirm terminal type (spade size) and lead length for proper connection.
- Match mounting style (clip-on vs. bracket) to ensure correct evaporator contact.
| Item | Description |
|---|---|
| Thermal function | opens at specified temperature to cut power to defrost heater; closes as coil cools. |
| Mounting | Clip-on or bracket-mounted to evaporator coil; correct placement ensures accurate sensing. |
| Connector | Two quick-disconnect spade terminals; verify size and orientation. |
| Typical symptom of failure | Continuous heater operation or absence of defrost resulting in ice buildup on evaporator. |
Replacement Considerations,Required Parts and Step-by-Step Installation for the Termination Switch
The 216731001 Frigidaire Refrigerator Termination Switch is a temperature‑sensitive electrical switch used to terminate a timed cycle-most commonly the defrost heater-when the monitored temperature reaches the specified set point. In normal operation the element is closed at low temperature to allow current to flow to the heater or control circuit and opens as the sensor reaches its trip temperature, preventing overheating of the evaporator or continuing an unnecessary defrost. Technicians should verify physical mounting, terminal type (usually 1/4″ spade terminals), and part number against the refrigerator’s service sheet because similar switches can differ in trip temperature, lead length, and mounting clip style; using the correct OEM or approved equivalent avoids incorrect cycling or poor mechanical fit.
Replacement requires the new 216731001 part, basic hand tools and a multimeter. Typical required items are the replacement termination switch, insulated spade connectors or crimp sleeves sized to the existing wiring, heat‑shrink tubing or electrical tape, and cable ties to secure leads. Follow these practical steps for safe installation and verification:
- Disconnect power at the breaker or unplug the refrigerator before any access to internal wiring.
- Remove the evaporator access panel and locate the termination switch fastened to the evaporator or mounting bracket; note wire colors and terminal positions or label them.
- Measure continuity across the switch at ambient temperature to confirm open/closed state prior to removal, then disconnect the terminals and remove any mounting clip or screw.
- Install the new switch in the same orientation, connect wires with properly sized connectors, insulate with heat‑shrink, and secure wiring away from moving parts or the heater element.
- Restore power and verify operation by measuring continuity change as temperature rises (or by initiating a controlled defrost cycle per service manual) and observing that the defrost heater de‑energizes at the expected point.
| Item | Description |
|---|---|
| Function | Temperature‑activated open/close switch used to terminate defrost or control circuits |
| Terminals | Typically 1/4″ spade terminals; confirm orientation and number of poles before replacement |
| Mounting | Push‑in clip or screw mount adjacent to the evaporator coil-ensure firm thermal contact with the sensor location |
| Failure symptoms | Continuous defrosting, frost buildup, or heater not turning off; lack of expected continuity change with temperature |
Troubleshooting Procedures and Multimeter Diagnostics for Termination Switch Fault Isolation
The 216731001 Frigidaire Refrigerator Termination Switch is a temperature‑actuated safety and control device most commonly used to terminate defrost heater current or to sense evaporator temperature for cycle control. In normal operation the switch is conductive (closed) at low evaporator temperatures and opens when the sensor reaches its design setpoint, interrupting the heater circuit. Failures present as either a permanently open device that prevents defrost heaters from running (leading to frost buildup and cooling loss) or a permanently closed device that allows heaters to run unchecked. Verify compatibility with a specific Frigidaire model by matching the part number and connector style before replacement; mechanical mounting and terminal orientation must match the original to ensure correct thermal response and safe operation.
For fault isolation use a digital multimeter set to continuity or low‑range ohms and perform tests with the switch isolated from the appliance wiring. Disconnect power and unplug the refrigerator, then remove the termination switch from the harness or disconnect its terminals. At ambient cold temperature the metre should show continuity (near 0-5 Ω) on the closed contacts; apply a controlled heat source (warm air or a temperature bath) while monitoring the meter-when the switch reaches its setpoint it should open to infinite resistance (OL). If the switch shows intermittent contact, fails to change state, or has resistance considerably outside the closed range, replace it. Also inspect wiring and connector pins for corrosion or high resistance, since harness faults commonly mimic switch failures.
- Observe frost patterns and heater operation before disassembly to narrow fault causes.
- Safety first: remove mains power before disconnecting and testing the switch.
- Measure continuity at cold and while applying heat to confirm state change.
- Check connector continuity and harness for shorts or high resistance.
- Replace with the matching 216731001 part if terminals, mounting, and rated temperatures match the service specification.
| Item | Description |
|---|---|
| Closed (cold) | Continuity; typical DC resistance near 0-5 Ω when functioning correctly |
| open (at setpoint) | Infinite resistance (OL) when the termination temperature is reached |
| Diagnostic check | Disconnect power, measure across terminals, then apply controlled heat and observe state change |
Q&A
What is the 216731001 Frigidaire refrigerator termination switch?
The 216731001 is a temperature-sensitive termination switch (also called a defrost thermostat or termination thermostat) used on some Frigidaire refrigerators. It monitors the evaporator coil temperature during a defrost cycle and opens when the coil reaches the thermostat’s set‑point, cutting power to the defrost heater so the unit stops defrosting once ice has melted.
How can I tell if the termination switch is faulty?
Common symptoms of a failing termination switch include excessive frost/ice build-up on the evaporator (switch stuck open so heater never runs) or the heater running continuously and overheating the evaporator area (switch stuck closed). Other signs are higher than normal freezer temperatures, frequent long defrost cycles, or the fridge not cooling properly after defrost. Always rule out the defrost heater and control board before assuming the termination switch is the cause.
How do I test the 216731001 termination switch?
First disconnect power to the refrigerator. Locate the switch clipped to the evaporator coil, disconnect its spade connectors, and measure continuity with a multimeter. At a cold temperature (near frozen) the switch should typically show continuity (closed). When warmed above its operating point (by hand or brief warm air), it should open and show no continuity. If it dose not change state appropriately, it needs replacement. Be careful not to short other components and avoid bending the evaporator fins.
Is the 216731001 termination switch compatible with all Frigidaire models?
No. The 216731001 is used on specific Frigidaire/Frigidaire Gallery/Kenmore models. Always verify compatibility by checking your refrigerator’s model number and consulting the official parts list or an authorized parts supplier. Using the wrong thermostat can cause incorrect defrost behavior and potential damage.
How do I replace the termination switch safely?
Turn off and unplug the refrigerator first. Remove the interior back panel of the freezer compartment to access the evaporator and the termination switch (frequently enough clipped to the evaporator coil). Disconnect the wiring (note connector positions or take a photo), unclip or unscrew the old switch, and install the new one in the same position and orientation. Reconnect the spade connectors,reassemble panels,restore power,and run a defrost diagnostic or monitor cycles to confirm proper operation. If you are unsure, hire a qualified appliance technician.
What tools and materials do I need for replacement?
Typical tools: screwdriver set (Phillips and/or nut drivers),needle‑nose pliers,multimeter for testing,and possibly a small putty knife to remove panels. Replacement part (216731001) and electrical connector protectors if needed. Always have the refrigerator unplugged and take care around sharp sheet metal and evaporator fins.
What causes termination switches to fail, and how long do they last?
Termination switches can fail from age, mechanical wear, corrosion of contacts, moisture/ice damage, or being subjected to excessive heat/cycle stress. Lifespan varies with usage and conditions; many last years but may fail earlier in high‑humidity or fault conditions (e.g., a shorted defrost heater). Regular inspection during service can catch problems early.
where can I buy a replacement 216731001 and how much does it cost?
You can buy the 216731001 from Frigidaire parts dealers, authorized appliance parts distributors, or reputable online appliance parts retailers. Price varies by seller but typically ranges from a low-cost thermostat price up to a modest parts fee (check current listings for exact pricing). Always confirm you are ordering the correct part for your refrigerator model and prefer OEM replacements for best compatibility.
Final Thoughts
The 216731001 Frigidaire Refrigerator Termination Switch serves a critical role in the appliance’s defrost control system by sensing coil temperature and terminating the defrost cycle at the appropriate point. Proper function of this switch helps prevent over‑defrosting, reduces stress on the compressor and other components, and contributes to steady temperature control and energy efficiency. as a small but essential safety and performance component, it affects both the reliability and longevity of the refrigerator when operating within intended parameters.
Because symptoms of a failing termination switch can resemble other issues (excessive frost buildup, erratic temperatures, or continuous cooling cycles), careful diagnosis is important to confirm its condition before replacement. Testing with appropriate tools or consulting a qualified technician can avoid unnecessary parts changes and ensure the correct repair path. When diagnosis confirms failure, timely replacement of the 216731001 termination switch with a compatible part restores proper defrost operation and helps maintain appliance performance and efficiency.
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