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BillyHvac, Journeyman HVAC Tech
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I have a pellet stove, Quadra Fire type, CB1200 installed 2002,

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I have a pellet stove, Quadra Fire type, CB1200 installed 2002, fabrication year:1998.
When set temperature is reached, furnace cycle goes down.
However, the hot air circulation fan do not stop until1.5 - 2h after setpoint has been reached.
According to manual this indicates the thermocontact(thermoswitch?) no1 is defect.

Do you see any other cause for this to happen???
[email protected]

You are correct. The snap disc has become uncalibrated and is just not performing in the parameter it was designed for.

This is part number SRV230-0470.

Here is an example of an online source.

SRV230-0470 Snap Disc


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