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[RFI] Whirlpool Gas Range RFI Solution

To: "RFI Reflector" <rfi@contesting.com>
Subject: [RFI] Whirlpool Gas Range RFI Solution
From: "Ward Silver" <hwardsil@gmail.com>
Reply-to: Ward Silver <hwardsil@gmail.com>
Date: Sun, 5 Dec 2010 19:59:26 -0600
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
This is a post to get a specific solution into the archives.

73, Ward N0AX

Whirlpool Gas Range, model SF385PEE

Symptom: Transmitting with 25 or more watts to nearby low dipole (20-30' 
directly over range) at or below 10 MHz causes oven door latch solenoid to 
activate.  Latch is released when transmitting stops, but eventually the 
controller displays an error code and no longer responds.  Error code clears on 
pressing OFF and normal operation resumes.

Unsuccessful fixes included
1. Corcom ac line filter
2. Several turns of ac line cord on Radioshack ferrite split-core in addition 
to 1
3. Radioshack ferrite snap-on core on cable bundle to controller P3 (switch and 
sensor I/O)
4. Radioshack ferrite snap-on core on cable bundle to controller P4 (ac input)

Successful fix (both required)
A. 0.0068 uF ceramic capacitor from ac hot and ac neutral to nearby controller 
chassis mounting screw - capacitors must be ac line rated
B. 0.0068 uF ceramic capacitor across all three I/O circuits of P3; oven temp 
sensor, door switch input, door latch output

Fix was verified by removing bypass capacitors from either P3 or P4 and 
symptoms returned.  All unsuccessful fixes except 4 were removed.  4 was left 
on "for good measure".

Capacitors were attached by inserting their wire leads into the plastic sockets 
of P3 and P4 for friction fit.  Capacitors for A will be re-installed with 
insulated "tee" connector in wiring harness after the proper parts are obtained.

Keywords: Whirlpool, gas range, SF385PEE, oven door latch, RFI, solution, cure, 
fix, error code

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