Question about Shaw Robert RS-9420 Thermostat
Hmm. I don't think it posted the first time around. So I'll try again.
There is a temperature sensing diode on the back side of this thermostat's circuit board. This diode may have failed or become disconnected.
I'd lean towards its having become disconnected, as I've been inside an example of this Robertshaw (originally Maple/Chase) 9600 thermostat and noticed that the soldering on this part was of poor quality. So if you have a soldering iron, and know how to use it, you could probably fix it.
I have a web page (just the facts, no ads, malware or fluff) that talks of some other common problems with this thermostat and how to fix them:
Posted on Apr 03, 2010
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Posted on Jan 02, 2017
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