318022001 Frigidaire Oven Primary Board Relay is a printed-circuit-board-mounted relay used on the oven’s primary control assembly to switch mains-level loads under command of the control electronics. As a switching component it provides electrically isolated control of high-current circuits by using a low-voltage driver signal from the control board to open or close contacts (or, in some designs, to gate a solid-state switching element). the relay is a discrete part on the main control PCB and is designed to handle the voltage and current demands typical of oven subsystems while fitting the board’s mechanical and thermal constraints.
Inside the appliance the relay interfaces between the microcontroller/driver circuitry and power loads such as bake and broil heating elements, convection fans, or igniters in gas models; it also works in concert with safety inputs (temperature sensors, door switches, thermal fuses) and the user interface to implement timed and temperature-controlled operations. As it performs line-voltage switching, its correct operation affects both functional control and safety – providing controlled energization of heating elements while isolating the low-voltage control electronics from mains power. Failures or degraded performance of the relay can therefore produce no-heat, continuous-heat, intermittent operation, or nuisance tripping depending on the nature of the fault and the systems it drives.
This article will describe the relay’s intended function and electrical role on the primary control board, how to identify compatible replacements and verify part number correspondence, common failure symptoms and diagnostic steps, and practical troubleshooting and replacement considerations.You will find guidance on electrical checks (coil/drive voltage, contact continuity under load, visual inspection for heat or arcing damage), mechanical and connector considerations when replacing the component, and notes on safety and rating-matching so technicians and appliance owners can make informed repair decisions without unneeded assumptions about underlying causes.
Table of Contents
- Function and Role of the Primary Board relay in Frigidaire Oven Control Systems
- How the 318022001 Frigidaire Oven Primary Board Relay Works Within the Oven’s Main Control Board
- Common Failure Symptoms and Electrical Diagnostic Indicators of a Faulty Primary Board relay
- Replacement Considerations and Installation Procedure for the Primary board Relay
- Q&A
- The Way Forward
Function and Role of the Primary Board Relay in Frigidaire Oven Control Systems
The 318022001 Frigidaire Oven Primary Board Relay is the electromechanical switching device on the oven’s main control board that connects and disconnects mains power to high-current circuits such as the bake and broil elements, convection fan, or surface burners. The relay is driven by the board’s low-voltage control circuitry (transistor or driver IC) and provides galvanic separation between the logic electronics and 120/240 VAC power. in service, this relay handles repeated on/off cycles and inrush currents; its contacts and ratings (voltage, current, and contact configuration) determine whether it can reliably switch the element loads without overheating, arcing, or contact welding.
- Intermittent heating or no heating despite correct control signals
- Audible clicking on switching or persistent arcing smell
- Visible contact pitting or discoloration on inspection
| item | Description |
|---|---|
| Part | 318022001 Frigidaire Oven Primary Board Relay (board-mounted switching relay) |
| Contact Rating | Typical 240 VAC, 25-40 A (verify exact rating for model) |
| Compatibility | Match board number, pinout, and harness connectors; confirm thermal/protection interlocks |
For compatibility and troubleshooting, verify the relay’s coil drive and contact continuity with a meter before replacing the board: measure the control signal on the relay driver when a call for heat is made, and check that the relay contacts close under load. Replacement requires matching the relay’s electrical ratings and mounting/pin configuration; swapping in a relay with insufficient current rating or incorrect polarity/connector layout can produce repeated failures or unsafe conditions. Technicians should also inspect associated components (thermal fuses, high-limit thermostats, wiring harnesses) since those failures can mask a healthy relay or conversely stress a new relay if left unaddressed.
How the 318022001 Frigidaire Oven Primary Board Relay Works Within the Oven’s Main Control Board
318022001 Frigidaire Oven Primary Board Relay is the power-switching element mounted on the oven’s main control board that connects and disconnects mains voltage to high-current loads such as the bake or broil heating elements and circulation fans. The relay provides galvanic isolation between the low-voltage control electronics and the 120/240 VAC circuits the oven uses; when the control MCU or driver stage issues a call for heat, a drive signal actuates the relay (mechanical contact or solid-state switching device) to complete the mains circuit.As the relay is specified for the board’s expected load and pinout, replacement parts must match contact arrangement, coil/drive voltage and current rating to avoid contact overheating or driver-stage stress.For example, during a bake cycle the board times and pulses the relay to regulate temperature based on the oven sensor feedback, and a failed relay can present as continuous heating, no heating, or intermittent element operation.
Within the main control assembly the relay works in coordination with temperature sensors, safety interlocks and the control algorithm: the MCU monitors the oven sensor and energizes the relay in a time-proportional manner (on/off cycles) to maintain setpoint, while safety devices in series prevent relay-driven power if a fault is detected. Troubleshooting typically involves confirming the board issues a drive signal, verifying mains presence at the relay contacts when energized, and measuring contact resistance and driver-stage outputs-symptoms such as audible clicking, burn marks on the board, welded contacts, or open contacts under load point to relay or contact failure. When replacing the relay, choose a unit with equivalent switching capacity and identical terminal/pin configuration to ensure compatibility with the 318022001 board and prevent collateral damage to the control electronics.
- No heat or element not energizing when commanded
- Intermittent heating or unexpected continuous heating
- Audible clicks when switching or visible contact arcing/burn marks
- Correct replacement requires matching voltage/current ratings and pinout
| Item | Description |
|---|---|
| Function | Switches mains power from main control board to heating elements and motors |
| Typical switching capacity | Matched to oven element currents (commonly 120/240 VAC, high-amp ratings) |
| common failure signs | Intermittent/no power to element, audible clicks, visible contact wear or heat damage |
Common Failure Symptoms and Electrical Diagnostic Indicators of a Faulty Primary board Relay
The primary relay on the oven’s main control board is the high-current switch that connects line voltage to the bake, broil, and convection heating circuits under direction of the control electronics. The 318022001 Frigidaire oven Primary board Relay is specified to handle the oven’s mains load and is paired with connector pinouts and mounting on the primary PCB; when the relay fails, the control logic may command heat but the heater elements will not receive power, or conversely the elements may be powered continuously.In practice, compatibility means matching the relay’s contact rating and coil drive type to the board: electromechanical relays require proper coil voltage and soldered power traces sized for the thermal current, while solid-state switches require the correct drive polarity and heat-sinking on the board.
- Intermittent or no heating while the control displays a call for heat
- Audible clicking or chattering from the control area during a cycle
- Continuous heating that doesn’t stop when the thermostat or timer indicates off
- Visible discoloration, pitting, or melted solder around the relay contacts or board traces
Diagnosis focuses on comparing commanded outputs from the control logic with the actual mains present at the relay outputs. A reliable indicator of a failed relay is the absence of mains voltage at the relay output terminals when the board is requesting heat, or the presence of mains at the output when the board is idle. Use a process of verifying: confirm the board is receiving proper line voltage, observe the control signal to the relay coil or drive pin, and measure the relay output under load conditions; a contact resistance that remains high or opens under load suggests contact wear or welded contacts. Thermal and visual inspection often reveals cracked solder joints or heat damage to the PCB that cause intermittent contact-these faults can mimic failed relays and may require reflowing or replacing the board along with the relay to restore reliable operation.
| Item | Description |
|---|---|
| Typical symptom | No heat when user calls for bake/broil; relay commanded but output = 0 V |
| Electrical reading | Line in: ~120/240 V present; Relay out: 0 V (when commanded) indicates open contacts |
| Visual clue | Burn marks, pitted contacts, or cracked solder joints near relay footprint |
Replacement Considerations and Installation Procedure for the Primary Board Relay
The 318022001 Frigidaire Oven Primary board Relay is an electromechanical switching element mounted on the oven’s primary control PCB that transfers line voltage to high-current circuits such as the bake and broil elements. The relay’s coil is driven by the board’s output stage and its contacts carry the supply current; therefore successful replacement requires a relay with the same coil drive characteristics, contact rating and pinout as the original. Typical failure modes include contact welding or pitting,coil open/short conditions,and degraded solder joints on the PCB; symptoms a technician will observe are repeated clicking with no element voltage,intermittent heating,or absence of expected line voltage at the element terminals while the board’s driver appears to energize the relay.
When replacing the relay follow a controlled repair procedure to avoid secondary damage to the board and ensure compatibility with the oven model:
- Disconnect mains power and document/model the control board and oven model numbers so the replacement matches the original part specifications.
- Photograph wiring and connector locations, then discharge any board capacitors before touching components.
- Remove the relay by unsoldering (or unplugging if socketed),inspect nearby traces and pads for heat damage,and install the replacement with equivalent soldering technique or connector seating.
- Verify coil continuity and that the contact rating and pinout match the original part markings, then power up and perform a restricted functional test (monitor element voltage and relay actuation) before final reassembly.
| Item | Description |
|---|---|
| Function | Switches line voltage to oven heating circuits under primary board control |
| Contact rating | Typically marked on relay (verify; commonly around 20-40 A at 240 VAC) |
| Compatibility check | Match coil drive voltage, pinout, mounting, and PCB footprint to original relay |
Q&A
What is the 318022001 frigidaire oven primary board relay and what does it do?
The 318022001 is the relay section (or the primary relay on the control/oven control board) used by some Frigidaire ovens to switch high-current power to major loads such as the bake or broil element, convection blower, or gas valve/igniter circuit. When the control calls for heat or another function, the relay closes to apply mains voltage to the appropriate component.
What symptoms indicate the primary board relay might be failing?
Common symptoms include the oven not heating at all, intermittent heating, oven elements being permanently energized (stuck on), audible clicking or buzzing from the control area, or error codes related to heating or control faults. You may also see visible signs on the board such as burned contacts, charring, or a strong burnt-odor near the relay.
How can I safely test whether the relay is bad?
First, power must be disconnected before any physical inspection. Check the board for burn marks or damaged components. For live functional testing (only if you are qualified and comfortable working with line voltage): restore power, set the oven to call for heat, and measure the voltage at the relay output/harness to the heating element or valve. For electric elements you should see the expected mains voltage (typically ~240 VAC in U.S. ranges) when the thermostat calls for heat. If the control signals the relay (board logic present) but there is no output voltage, the relay or driver circuitry is faulty. Always observe lockout/tagout and use insulated tools and a properly rated meter; if unsure, hire a technician.
Can I replace only the relay or do I need to replace the whole board?
In most Frigidaire ovens the relay is integrated into the control/primary board and is not sold separately. That means a failed relay generally requires replacing the entire control board (or the entire control assembly) rather than swapping a discrete relay. Some aftermarket services may rework or replace relays on boards, but that should be done only by a qualified electronics technician.
What are the basic steps to replace the 318022001 primary board?
general steps: 1) Disconnect power at the breaker. 2) Remove the control panel or console access panel per the model service manual. 3) photograph or label all harness connectors so reassembly is correct. 4) Unplug the board’s ribbon cable and wire harnesses and remove mounting screws. 5) Install the replacement board, reconnect harnesses, and resecure the panel. 6) Restore power and test functions.As this work involves mains voltage and controls,follow the oven’s service manual and safety guidelines; if you are not experienced with appliance electrical work hire a technician.
How much does a replacement primary board (318022001) typically cost and where can I buy one?
Prices vary by seller and whether the board is OEM or aftermarket; typical part cost can range from roughly $80 to several hundred dollars. Labor for replacement (if performed by a technician) adds to the total. Buy from Frigidaire-authorized parts distributors, major appliance parts retailers, or verified online sellers to ensure you get the correct OEM part and warranty. Verify the part number against your oven model before purchase.
Are there troubleshooting steps I should do before replacing the board?
Yes. Verify the fault isn’t a simpler issue: check the element or igniter for continuity or visible breaks, test the oven temperature sensor/thermistor resistance for proper values, confirm fuses and household breaker are OK, and inspect wire harness connectors for corrosion or loose pins. Many failures that look like a control board problem are actually caused by a shorted element, bad sensor, or loose connection. If those components test good and you still have switching issues at the board output, replacement of the control board is more likely required.
The Way Forward
The 318022001 Frigidaire Oven Primary Board Relay functions as a critical control element within the oven’s primary control board, managing power delivery to heating elements and coordinating timing signals that enable accurate temperature regulation and safe operation. As the relay directly influences heating cycles and system responsiveness, its proper function is essential to maintaining performance, energy efficiency, and user safety.
Accurate diagnosis is vital when symptoms such as inconsistent heating, failure to maintain temperature, or intermittent operation appear, as these issues can originate from wiring, sensors, or the board itself. Confirming the relay as the source of the problem through systematic testing helps avoid unnecessary part replacement and ensures a reliable repair. When replacement is necessary, using the correct 318022001 component or an equivalent OEM-approved part, and following appropriate safety and installation procedures, preserves oven functionality and reduces the risk of recurrence.
recognizing the role of the 318022001 relay and prioritizing proper diagnosis and replacement when warranted supports long-term appliance reliability and safety. Professional evaluation or adherence to manufacturer guidelines for repair will help ensure that corrective actions are effective and that the oven continues to operate as intended.
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