SOURCE: i have a robertshaw 9420
Hi, ere is a tip that will help you try to figure out why your furnace is not working.
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...
Basic Furnace or Heating System Troubleshooting
heatman101
SOURCE: the screen went blank and there doesn't seem a
There doesn't seem to be a battery in that model. Supposed to be permanent memory. You can download a PDF manual at this site if you need it.
http://www.honeywell-thermostat.com/honeywell/RS-9420.html
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
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