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Error code · Microwave

F1 E4 Code on a Whirlpool Built-In Microwave: Power Relay Circuit

On a Whirlpool built-in microwave or microwave drawer, such as model WMC50522AS, F1 E4 tells you the control found a problem that may involve the microwave appliance manager or the microwave power relay, or the wiring…

Medium · inspection needed
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Code
F1 E4
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F1 E4 means

On a Whirlpool built-in microwave or microwave drawer, such as model WMC50522AS, F1 E4 tells you the control found a problem that may involve the microwave appliance manager or the microwave power relay, or the wiring tied to them. The relay is the switch that sends power to the microwave section, so the oven may run its display and light but not heat. This is different from the over-the-range F1E4, which names the appliance control board.

Common causes of F1 E4

  • Microwave power relay
  • Microwave appliance manager
  • Wiring to the relay and manager
✓ One safe check you can try

1. Switch off the microwave's breaker and leave it off for one minute. 2. Switch it on again. 3. Monitor the oven for one minute to ensure F1 E4 does not return. 4. Heat a cup of water for a short time to see whether the oven works. 5. If it returns, keep the oven off and call us.

! Why to stop there
  • We test whether the relay is switching power and whether the appliance manager is commanding it, since the code names both.
  • An oven that lights but does not heat points us to the power path.
  • The written price comes before any repair, and older units get an honest verdict on repair value.
Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.
→Same appliance

Other Microwave codes

FC E8Whirlpool OTR Microwave Registration Code FC E8: Entry Mistake FCE8Whirlpool Over-the-range Microwave Registration, FCE8: Wrong Model Selected Feature Not Available or Fault DetectedWhirlpool Built-in Microwave Message "Feature Not Available": Retry or Cut Power LOCWhirlpool Microwave LOC on the Display: Control Lock Is On PFWhirlpool Over-the-range Microwave Showing PF: Power Failure Indicator Press Cancel to ResetWhirlpool Built-in Microwave Message "Press Cancel to Reset": Error Cleared by Cancel F8 E4Whirlpool Microwave Drawer Error Code F8 E4: Exhaust Air Temperature Sensor Probe or Insert ProbeWhirlpool Built-in Microwave Asking for "Insert Probe": Seat the Meat Probe
F1 E4F1 E4 questions
What does the microwave power relay do?

It switches power to the microwave heating section when the control calls for it. If it or the manager has a problem, the oven may show F1 E4 and not heat.

Is F1 E4 the same on an over-the-range microwave?

No. On an over-the-range model, F1E4 names the appliance control board. On this built-in model, F1 E4 names the appliance manager or the power relay.

Is it worth fixing an older microwave with F1 E4?

Often, when the cause is a single relay or connector. We tell you plainly if the repair cost is not worth it for your unit, and you get a written price before work.

Book a visit

Still seeing F1 E4?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 589-6107