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Russ here. If you installed batteries and screen is blank. You have bad thermostat. If this is a gas furnace you remove thermostat and place a small wire between R and W on the sub base. You can also take R and W wires off and twist together. This will bring heat on.. The is temp so do not leave R and G together after house warms up. If this a heat pump get back with me for more instructions. Russ
Do you still need help. Russ
No problem thank.