I have an Amana thermostat. Changed batteries now blank display". I used new batteries. Before I changed them it was working. .i do not have a manual

SOURCE: Chronotherm III Thermostat Completely Blank Screen, No Heat

One of two things either the disply has gone out which is likely as it is a common failure for that thermostat or your heating unit is not sending control power. the older chronotherms were system (24volt ac) powered the new hardware/box store units are battery powered. Either way display should not be blank with fresh batteries. to get heat on remove the thermostat jumper or twist together the wire from the R terminal with the wire from the W terminal. note the color of each wire for later reference, heat up house disconnect wires from each other and go purchase a new thermostat

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

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

Testimonial: "A+A+A+ Good attitude!"

SOURCE: display not working after battery change

some have a small reset button on the back where you push it with a pencil tip. That may help!

SOURCE: Need Manual for Vital Fitness Exercise Bike RB26S

I have a manual for this model. I can not tell you how to find one, I have looked all over the net for additional info. on this model and can't find anything. Would be glad to scan and send you a copy if you still need it.

SOURCE: The thermostat worked correctly for months then

Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need