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Troubleshoot robertshaw thermostat 9420

The temperature button is not moving ?

Posted by Anonymous on

3 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

heatman101
  • 43501 Answers

SOURCE: i have a robertshaw 9420

Hi,
You are not getting the 24v power from the furnace...
Either the furnace power is off... the 24v transformer went bad...
or there is a fuse that blew which is interupting the 24v power from the trnasformer...

The blank screen in other words is an indication of amuch larger problem...
you need to find that power problem and fix it...


ere is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting

heatman101

Posted on Dec 07, 2010

  • 1 Answer

SOURCE: error code on robertshaw 9420 thermostat

thermostat gives the temp degree example 70 fl

Posted on Dec 29, 2010

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1 Answer

I have a robertshaw 9420 and the screen is blank it takes no batteries and the reset button has no effect. the manual is of no assistance what so ever


Hi,
You are not getting the 24v power from the furnace...
Either the furnace power is off... the 24v transformer went bad...
or there is a fuse that blew which is interupting the 24v power from the trnasformer...

The blank screen in other words is an indication of amuch larger problem...
you need to find that power problem and fix it...


ere is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting

heatman101

Dec 07, 2010 | Shaw Robert RS-9420 Thermostat

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Replacing 9420 robertshaw hooking up 6300B honeywell. I have a wire (W2) i don't know what to do with?


Hi,
If you have a single stage furnace, you do not need that wire....if you have a two stage, then you cannot use that thermostat because it will not do 2 stage...

heatman101

Apr 28, 2010 | Honeywell Focus 6300B 5-2 Days...

1 Answer

We had a reverse problem with our Robert Shaw thermostat we left the thermostat setting at 52 so the pipes wont freeze we wore gone for a week, when we got back the up-stairs wore over 100 the thermostat...


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...

Feb 04, 2010 | Shaw Robert RS-9420 Thermostat

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My Robertshaw 9600 displays 99 degrees and because it is satisfied, is not calling for heat. The temp is actually in the lo 60's and falling. I've tried battery replacement, but nothing changed. Other...


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/

Feb 04, 2010 | Shaw Robert RS-9420 Thermostat

1 Answer

My Robertshaw 9420 thermostat keeps flashing, it won't let me set a temperature.


my robertshaw 9420 wont let me set a temp and two snowflakes are flashing

Dec 23, 2009 | Heating & Cooling

1 Answer

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


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

Jul 25, 2009 | Shaw Robert RS-9420 Thermostat

1 Answer

Robertshaw 9420 thermostat engages inside fan in OFF position


check with the company u brought it from and check if you have not put the correct conector to the right temals on the back of the switch.

Jun 09, 2009 | Heating & Cooling

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