At my wits end...pellet stove stuck on high flame mode but nothing else working

[Collinsta]

We puchased a used profile 30 pellet stove 6 months ago. I has worked great with no problems for about 2 months now. The stove just shut down a couple night ago, we have unplugged it and the stove is not doing anything but showing "high" for the heat on the control board. We have checked wiring, and cleaned all possibl;e sources (ash box,photo eye and so on. Has anybody else had this problem. Does any one know if the stove has a reset button that will reset the stove? Please help

 

[KeithO]

Depending on the type of temperature sensor used to detect overfiring, an open circuit may be read as MAX temperature. Alternatively, a short could also possibly come up as max temperature. I suggest you identify where the temperature sensor is located, remove and test it. It is more likely to be a PT100 style device (varistor) than a true thermocouple, since a thermocouple needs a fancy signal conditioner that is typically considered too expensive for this application. Alternatively it may be a bimetallic switch (most likely scenario), and with metal fatigue and corrosion they do eventually fail.

If it is a switch, you are looking for an open / closed status, depending on temperature (can test with a small blowtorch). If it is a linear style sensor, the varistor will show a resistance that changes proportionally to the temperature.

I'm fairly sure it will be the simplest type (switch).
Keith

 

[Collinsta]

We will give that a try and cross our fingers. I think we had tried everything but that.