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Replacing a thermostat with a different model requires careful consideration of compatibility, wiring, and features. To determine if a Robertshaw 9560 can replace a 9420:
Verify compatibility with your HVAC system based on manuals.
Check wiring compatibility or consult an HVAC technician.
Compare features to meet your heating/cooling needs.
Robertson 9420 is a multistage thermostat designed to control 24V heat pump systems,while the Emerson does that and more. So it seems it should be a possible replacement. However, the wiring may be more complex, depending on the layout and system.
Here is the info on both:
hi
the sensing ( sensor ) within the unit is mostly clogged up with fluff as the fun intakes the cold air ( of the room ) and pushers the cooler air back into the room . the system have filters behind the flutes ( made of fibres you can blow them with air blower then can be re used ) it within this area where the sensor is located
Same thing happened to mine, it was replaced and the new one did the same thing about a year later. Needless to say it was no longer under warranty, which is no problem as I will not have another Robertshaw 9420 installed in my home. Very dangerous, especially if you are not home and it goes up to 99 or higher...
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:
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