Question about Shaw Robert RS-9420 Thermostat

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No display on Robertshaw 9600; unit seems dead/furnace works

How do I troubleshoot a Robertshaw 9600 with no display?

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  • richielj Jul 26, 2009

    I've changed the batteries twice. I know the heater works because we have two zones in our house and the other stat turns the unit on. I'm thinking I should just buy a new Robertshaw 9600.

    Thanks!

  • richielj Aug 22, 2009

    This is a good tip. I double-checked the batteries but the display on the unit was dead. I replaced the thermo.

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Have you checked to make sure you have a fresh battery in it

Posted on Jul 26, 2009

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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:

http://greyghost.mooo.com/maplechase9600/

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The manual is very specific.  http://www.icca.invensys.com/manuals/robertshaw/110-653B.pdf    The Robertshaw 9600 is the same unit. The terminals marked RH, RC, W, Y, G are where you put the wires, just loosen the set screws with a small flat head screwdriver, insert the bare wire into the hole and tighten the screw. Leave the jumper between RH and RC for most installations. The red wire goes to the RH. Please come back and comment if you need more specific help. Good luck

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Hello
you have to have a thermostat! The thermostat tell the unite what to do. Get a new one.

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No display on Robertshaw 9600; unit seems dead/furnace works


Repace the tstat. Bad display. Make sure the batteries you put in were good First. Russ

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