On 04/14/2020 11:35, Lee Hart via EV wrote:
For years I worked for Robertshaw and Honeywell designing furnace controls. A furnace control has to be DAMN fool proof, or it could (for example) open the gas valve without lighting the burner, fill the house with gas, and THEN light it. So the controls had every safety interlock we could think of to prevent this from ever happening.
Lee, I have a Robertshaw furnace control in my house. So THANK YOU for your efforts! Actually I did have one fail a couple years ago after 25 years or so in service. The failure mode was that it would light the pilot, but never turn on the main gas flow (and yes it was the controller, not the sensor that detects that the pilot is lit). But I would much rather have the house cold then on fire!
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