Honeywell T8090T Owner's Manual - Page 15
Troubleshooting
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Troubleshooting Your Honeywell Trol-A-Temp® Thermostat requires little or no attention. Most problems can be traced to the following. PROBLEM CHECK ACTION No heat. -system switch. May be in OFF or Move system switch to HEAT COOL position. 1 position. -fuse or circuit breaker. If blown or tripped, replace fuse or reset breaker. -furnace power switch. May be Off. Move switch to ON. -heating equipment for proper operation. -thermostat connections. See manufacturer's instructions. Turn Off power. Check for correct terminal hookups. Repair any frayed or broken wires. Firmly tighten all terminal screws. -airflow at register. Zone damper may be closed. 15 If damper is closed, contact a qualified service technician for assistance. (continued) 69-0432-1