Honeywell T8090A Owner's Manual - Page 14

Troubleshooting - instruction

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Troubleshooting Your Honeywell thermostat requires little or no attention. Most problems can generally be traced to the following: Problem No heat. 69-0574-2 Check Action - system switch. May be in OFF or Move system switch to HEAT position. COOL position. 1 - fuse or circuit breaker. If blown or tripped, replace fuse or reset breaker. - furnace power switch. May be Off. Move switch to ON. - pilot flame. May be out. Relight pilot flame per furnace manufacturers instructions. - R and W thermostat connections. Turn Off power to furnace. Check for correct terminal hookups. Repair any frayed or broken wires. Firmly tighten all terminal screws. Turn On power. - other problem. Contact a qualified service technician for assistance. (continued) 14

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69-0574—2
14
Troubleshooting
Your Honeywell thermostat requires little or no attention. Most problems can generally be
traced to the following:
Problem
Check
Action
No heat.
—
system switch. May be in OFF or
COOL position.
Move system switch to HEAT position.
—
fuse or circuit breaker.
If blown or tripped, replace fuse or reset
breaker.
—
furnace power switch. May be Off.
Move switch to ON.
—
pilot flame. May be out.
Relight pilot flame per furnace manufacturers
instructions.
—
R and W thermostat connections.
Turn Off power to furnace. Check for correct
terminal hookups. Repair any frayed or
broken wires. Firmly tighten all terminal
screws. Turn On power.
—
other problem.
Contact a qualified service technician for
assistance.
1
(continued)