Tjernlund draft inducer uses AT90S2313

Tjernlund draft inducer uses AT90S2313. I was contacted to analyze the failure modes of this controller. There are problems when a voltage spikes corrupting the flash. Most of the time when this happens the device ID is no longer valid. The part is still programable, and executes properly but some tools will indicate that programming has failed.

Here is the first of several controllers that i have obtained. The ISP is brought on on the left also some terminals were removed as well as the configuration DIP switch. This is a pretty basic board with some LED’s. I never developed a replacement firmware because the manufacturer seems to have corrected the problem in a later revision.

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