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Ask your question here Remove batteries and insert backward for five to ten seconds to reset thermostat. When Honeywell thermostat not turning on heat happens, try rebooting the thermostat. The Honeywell RTH230B is a programmable residential heating and cooling thermostat. Honeywell RTH221B Thermostat Operating Manual If you are interested in ordering a large quantity of items you may qualify for volume pricing discounts. I did a test. Voila! Replace batteries correctly: display should come on. With my gas forced air furnace and my Honeywell RTH221B thermostat, I set the switch on the back to water water/electric, instead of gas /oil. • Set System switch to Off. Temperature display does not go lower than 45°F (7°C) or higher than 88°F (31°C) during programming. Contact Honeywell with any questions. Learn how to wire basic thermostats and digital thermostats to operate heat and cooling. 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