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Seeking input diagnosing Matag stove circuit board.

Problem: Matag #MGS5770ADB Gas Stove/Range has a problem with the circuit board that controls the Gas Oven. When we try to turn on the oven by the touch-pad we get an error code `F1'. The circuit board behind the touch-pad is p/n_PS2357875_. There are no visible burn or scorch signs on the circuit board and the sole capacitor has not bulged.

Local appliance repairmen claim that the part costs over $300 but is no longer available because of damaged factory in Asia. I have replacement part price ranges from $458.81 down to $280.52 on the internet.

I seek input for a lead to finding the bad components so I can repair the circuit board. Component prices are only a few cents each and I can solder.

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Walter Yrle, check on this:"The F1 code indicates that:

a. The electronic range control (ERC) is sensing heat in the oven when in a time-of-day (1.e., not cooking) mode or

b. The ERC is receiving information to run multiple heat functions simultaneously.

Although different components (depending upon the model) could generate the code, simple and straightforward testing using your ohm meter is all you gotta do to test for it.

1. Check the oven temperature sensor. The oven sensor got to be within spec or it will cause the F1 code. As an example of being out-of-spec, the ERC will generate an F1 fault code when the sensor shows 1650 ohms during a time-of-day mode. This is equivalent to 350°F in the oven. The resistance isn't high enough to generate an F2 code (runaway temp) or an F3 or F4 code (shorted/open sensor circuit). The ERC monitors the sensor circuit after a heat cycle and expects the resistance to drop back to 1050-1100 ohms. The fault code is generated when this doesn't happen. Checking the sensor circuit means also checking the harness, harness connections and the sensor itself.

2. If the oven sensor circuit checks okay, then turn your inquisitive eyeballs to the touchpad. If the range has a separate touchpad/keyboard, the keypad may have moisture that is shorting several circuits simultaneously. If the F1 code is given immediately (instead of during or after a heat cycle), remove the ribbon connector from the touchpad to the ERC after clearing the F1 code. If the F1 code does not return in five minutes, then cast a suspicious gaze upon the touchpad/keyboard. Shorts may be caused by using an ammonia-based glass cleaner. The touchpad surface will absorb ammonia-based cleaners that are sprayed directly on the glass surface. When heat is applied, the surface material can break down causing shorts. If you're gonna use ammonia-based cleaners on your control panel, then you should spray it on the rag and then wipe the touchpanel -don't spray directly onto the surface of the touchpad.

3. If these tests all check good, then replace the ERC from here

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