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Replacing robertshaw thermstat 9520 with a Robertshaw 9420. On older thermostat there was a switch for gas or electric backup. There doesn't seem to be one on the newer model. have wiring labeled from old thermostat. Wired correctly-Display just blinks-Have heatpump with gas backup. Any suggestions appreciated Don

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Posted on Jan 02, 2017

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SOURCE: Wiring Amana Heat pump to inside unit and 9520 robertshaw

colors can vary. you should be able to locate a wiring diagram inside the airhandler and out door unit. you will have to remove the panels. generally though Green is fan RED is power WHITE is reversing valve Blue is common YELLOW is the contactor (usually have to jump w and y terminals at robertshaw tstats. PLEASE DOUBLE CHECK AT SYSTEM DIAGRAMS!!

Posted on Nov 22, 2008

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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.

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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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