Question about Honeywell Programmable Thermostat Heater

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Hi, I recently installed a Honeywell RTH230B in August, and it worked well with programming the A/C. Now that it is getting cold, I went to test the heater. After making sure that the furnace was set up, I went to turn the Tstat to Heat, and the display went blank. The fan was able to turn on, but there was no heat. When I turned the tstat off, the tstat then reset, and I lost all of my presets. Can you help fix this? Thanks.

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Jumper may be needed between "rh" anc "rc"

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