Harman p68 three blink status light, ESP troubleshooting

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Dec 3, 2019
Arlington, MA
I have a Harman p68 that is giving a three blink status code which points to a bad ESP probe.

I've tried replacing with a new probe as well as cleaning the existing probe.

The new probe I purchased has the same black wire as the existing probe (I read there's a red wired one and it's important to replace with the same color).

I've swept the chimney and cleaned out the stove.

What else can I try?

Also, can someone describe the procedure for testing the probe with a multimeter?